October 2006, Volume 48 Issue 10, Pages 1129-1253.


Cover Caption:
Floral ontogeny described under the scanning electron microscope (SEM) of two species from Magnoliaceae, a well-defined family and one of the earliest flowering plant. The top left image shows a mature flower of Magnolia amoena Cheng. It is solitary, bisexual, and haplomorphic, i.e. with spirally arranged organs inserted separately onto an elongated axis. The bottom right image shows that the carpel primordia are free and initiated alternately in acropetal succession. The floral apex gradually diminishes in height and diameter during carpel initiation (M. albosericea). See pages 1197¨C1203 for more details.

 

          Research Articles
Regulation of Eukaryotic Initiation Factor 4E and Its Isoform: Implications for Antiviral Strategy in Plants
Author: Yu-Yang Zhang, Han-Xia Li, Bo Ouyang and Zhi-Biao Ye
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00322.x
      
    In recent years, biotechnology has permitted regulation of the expression of endogenous plant genes to improve agronomically important traits. Genetic modification of crops has benefited from emerging knowledge of new genes, especially genes that exhibit novel functions, one of which is eukaryotic initiation factor 4E (eIF4E). eIF4E is one of the most important translation initiation factors involved in eukaryotic initiation. Recent research has demonstrated that virus resistance mediated by eIF4E and its isoform eIF(iso)4E occurs in several plant-virus interactions, thus indicating a potential new role for eIF4E/eIF(iso)4E in resistance strategies against plant viruses. In this review, we briefly describe eIF4E activity in plant translation, its potential role, and functions of the eIF4E subfamily in plant-virus interactions. Other initiation factors such as eIF4G could also play a role in plant resistance against viruses. Finally, the potential for developing eIF4E-mediated resistance to plant viruses in the future is discussed. Future research should focus on elucidation of the resistance mechanism and spectrum mediated by eIF4E. Knowledge of a particular plant-virus interaction will help to deepen our understanding of eIF4E and other eukaryotic initiation factors, and their involvement in virus disease control.£¨Author for correspondence. Tel: +86 (0)27 8728 3463; E-mail: hxli@mail.hzau.edu.cn£©
Abstract (Browse 2539)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
ISSR Analysis of the Genetic Diversity of the Endangered Species Sinopodophyllum hexandrum (Royle) Ying from Western Sichuan Province, China
Author: Meng Xiao, Qun Li, Li Wang, Liang Guo, Jing Li, Lin Tang and Fang Chen
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00304.x
      
    Sinopodophyllum hexandrum (Royle) Ying is an important medicinal and endangered species. Inter-simple sequence repeats (ISSR) analysis was conducted on seven natural populations from western Sichuan Province to investigate the genetic diversity of S. hexandrum. Leaf samples of 140 individuals were collected. Of the 139 discernible fragments generated by 12 selected primers (among 100 primers), 54 appeared to be polymorphic. The percentage of polymorphic bands (PPB) was 38.85% at the species level, and PPB within a population ranged from 7.91% to 23.74%. Low levels of genetic variation (He = 0.092, Ho = 0.142) and high levels of genetic differentiation among the populations (Gst = 62.25%) was detected on the basis of results from POPGENE and analysis of molecular variance (AMOVA), respectively. Furthermore, the limited gene flow (Nm = 0.361) may result from biological characteristics, such as self-pollination and short distance seed dispersal. Based on the genetic and ecological information available for S. hexandrum, we propose some appropriate strategies for the conservation of the endangered medicinal species in this region, namely rescuing and conserving the core populations for in situ conservation and sampling and preserving more populations with fewer individuals from each population for ex situ conservation.£¨Author for correspondence. Tel (Fax): +86 (0)28 8541 7281; E-mail: chenfang@scu.edu.cn£©
Abstract (Browse 2449)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Ramet Population Structure of Fargesia nitida (Mitford) Keng f. et Yi in Different Successional Stands of the Subalpine Coniferous Forest in Wolong
Author: Xiao-Hong Yu, Jian-Ping Tao, Yuan Li, Yong-Jian Wang, Yi Xi, Wei-Yin Zhang and Run-Guo Zang
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00330.x
      
    Forest structure and succession in Wolong Nature Reserve is influenced by the understory dwarf bamboo population. However, less is known about how the forest succession affects the dwarf bamboo population. To examine the bamboo ramet population growth of Fargesia nitida (Mitford) Keng f. et Yi and to determine how ramet population structure varies along the succession of coniferous forest, we sampled ramet populations of F. nitida from the following three successional stages: (i) a deciduous broad-leaved (BL) stand; (ii) a mixed broad-leaved coniferous (MI) stand; and (iii) a coniferous (CF) stand. We investigated the population structure, biomass allocation, and morphological characteristics of the bamboo ramet among the three stand types. Clonal ramets, constituting the bamboo population, tended to become short and small with succession. The ramet changed towards having a greater mass investment in leaves, branches and underground roots and rhizomes rather than in the culm. With respect to leaf traits, individual leaf mass and area in the BL stand were markedly bigger than those in both the MI and CF stands, except for no significant difference in specific leaf area. The age distribution showed that the bamboo population approached an older age with succession. The results demonstrate that the ramet population structure of F. nitida is unstable and its growth performance is inhibited by succession.£¨Author for correspondence. E-mail: taojianping@163.com£©
Abstract (Browse 2366)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Exchange of Proton and Major Elements in Two-Layer Canopies Under Acid Rain in a Subtropical Evergreen Forest in Central-South China
Author: Gong Zhang, Guang-Ming Zeng, Yi-Min Jiang, Chun-Yan Du, Guo-He Huang, Mei Zeng, Xiao-Kang Su and Ren-Jun Xiang
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00293.x
      
    Canopy exchanges of H+ and N (NH4+-N, NO3¨C-N) and other major ions were evaluated and quantified in two-layer canopies based on throughfall measurements in Shaoshan Forest during the period 2000¨C2002, central-south China. The collected annual rainfall, throughfall, and sub-throughfall were 1 401, 1 191, and 1 084 mm/year, respectively. Fifteen percent and 8% of rainfall (or 9% of throughfall) were intercepted by the top canopy and sub-canopy layers, respectively. The foliar leaching of base cations from the top canopy was significantly higher than that from the sub-canopy, and the latter accounted for 25% of the former. The uptake of H+ and NH4+ was significantly higher in the top canopy than in the sub-canopy, indicating that the canopy buffering capacity in the top canopy was stronger than the sub-canopy; Mg2+ can be absorbed from water flux on the sub-canopy foliar surfaces to compensate for the Mg deficit in the forest soil during the growing season.£¨Author for correspondence: Tel: +86 (0)731 882 2754; Fax: +86 (0)731 882 3701; E-mail: zgming@hnu.cn£©
Abstract (Browse 2180)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Formation of Mycorrhiza-like Structures in Cultured Root/Callus of Cathaya argyrophylla Chun et Kuang Infected with the Ectomycorrhizal Fungus
Author: Xue Sun, Yu-Hua Li and Lu-Min Vaario
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00334.x
      
    An in vitro system was used for ectomycorrhizal synthesis of Cenococcum geophilum Fr. with Cathaya argyrophylla Chun et Kuang, an endangered species. Calli initiated from stem segments and adventitious roots differentiated from young seedlings were removed and cocultured with Cenococcum geophilum on a modified Murashige-Skoog medium. Fungal hyphae were visible within intercellular spaces of the callus 4 weeks after inoculation, but definite and well-developed Hartig net structures did not form in the calli 8 weeks after inoculation. The typical ectomycorrhizal structures (i.e. hyphal mantle and intracortical Hartig net) were observed in root segments 8 weeks after inoculation. This is the first report of aseptic ectomycorrhizal-like formation/infection between root organ/callus of Cathaya argyrophylla and the ectomycorrhizal fungus Cenococcum geophilum. This culture system is useful for further investigation of mycorrhizal synthesis in Cathaya trees.£¨Author for correspondence. Tel: +86 (0)451 8219 1783; Fax: +86 (0)451 8219 1795; E-mail: lumin-fu@163.com£©
Abstract (Browse 2142)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Carbon Monoxide Alleviates Wheat Seed Germination Inhibition and Counteracts Lipid Peroxidation¡¡Mediated by Salinity
Author: Sheng Xu, Zhi-Sheng Sa, Ze-Yu Cao, Wei Xuan, Ben-Kai Huang, Teng-Fang Ling,Qiong-Ying Hu and Wen-Biao Shen
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00337.x
      
    Recently in animals, endogenous carbon monoxide (CO), like nitric oxide, was implicated as another important physiological messenger or bioactive molecule. However, little information is known about the physiological roles of CO in the whole plant. In the present study, we report that different concentrations of the CO donor hematin (0.1, 1.0 and 10.0 mol/L) alleviated wheat (Triticum aestivum L. Yangmai 158) seed germination inhibition caused by 250 mmol/L NaCl stress in a dose-dependent manner. These responses were also proved by the addition of different gaseous CO aqueous solutions from 0.1% to 100.0% of saturation. Among these treatments, the effect of 1.0 mol/L hematin and 1.0% saturation of CO aqueous solution were the most obvious. Furthermore, compared with non-hematin treatment, the degradation of storage reserves in wheat seeds was also accelerated. Time-course analyses showed that application of hematin dose-dependently increased the activities of superoxide dismutase, catalase, ascorbate peroxidase, and guaiacol peroxidase activities, thus decreasing the lipid peroxidation in germinating wheat seed subjected to salt stress. Meanwhile, the responses of hematin were specific for CO because the addition of the CO scavenger hemoglobin (0.2 g/L) blocked the various actions of 1.0 mol/L hematin. Taken together, the results of the present study demonstrate that CO, at a low concentration, is able to attenuate the seed germination inhibition produced by salinity stress and counteract the lipid peroxidation in germinating wheat seeds.£¨Author for correspondence. Tel (Fax): +86 (0)25 8439 6673; E-mail: wbshenh@njau.edu.cn£©
Abstract (Browse 2239)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Differential Expression of Rice Genes Under Different Nitrogen Forms and Their Relationship with Sulfur Metabolism
Author: Guo-Hui Zhu, Chu-Xiong Zhuang, Yu-Qi Wang, Lin-Rong Jiang and Xin-Xiang Peng
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00332.x
      
    Microarray analysis was initially performed to screen for differentially expressed genes between nitrate- and ammonium-fed rice (Oryza sativa L.) leaves. In total, 198 genes were shown to have a unique expression response to each treatment and most of the genes for which function is known were involved in signal transduction, plant stress resistance, transcriptional regulation, and basic metabolism. Northern blotting analysis confirmed that expression of the MT and PCS genes was highly upregulated in ammonium-fed leaves compared with expression in nitrate-fed leaves and it was further revealed that ammonium-fed leaves accumulated more cysteine and glutathione. The upregulated expressions of the MT and PCS genes and the higher levels of cysteine and glutathione in ammonium-fed leaves indicate that ammonium may be able to accelerate sulfur assimilation metabolism in rice leaves. Unexpectedly, Northern blotting analysis showed that the expression of the two key enzymes in the sulfur assimilation pathway, namely adenosine 5''-phosphosulfate reductase and O-acetylserine(thiol)lyase, was not upregulated by ammonium treatment. It was found that the total content of free amino acids was much higher in ammonium-fed leaves compared with nitrate-fed leaves, mainly resulting from an increase in several amino acids such as serine, asparagine, glutamine, and arginine. The increased amino acids, in particular serine (as a central substrate for the synthesis of the thiol metabolites), may have promoted sulfur assimilation metabolism under conditions of ammonium nutrition.£¨Author for correspondence. Tel(Fax): +86 (0)20 8528 2023; E-mail: xpeng@scau.edu.cn£©
Abstract (Browse 2351)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
NaCl and TDZ are Two Key Factors for the Improvement of In Vitro Regeneration Rate of Salicornia europaea L.
Author: Xiu-Ling Shi, He-Ping Han, Wu-Liang Shi1 and Yin-Xin Li
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00342.x
      
    The present study aimed to find out suitable conditions for the in vitro culture of Salicornia europaea L. and to develop an efficient regeneration system. S. europaea plants were regenerated successfully in vitro from callus derived from mature embryos. Via the method of 2,4-dichlorophenoxyacetic acid (2,4-D)-short-treatment on mature seeds, callus was induced from hypocotyls on the MS medium with 4.55 µmol/L N-phenyl-N''-1, 2, 3-thiadiazol-5-yl urea (TDZ) 3¨C4 weeks after the seeds germinated. The callus differentiated into shoots at a rate of 27.6% after subculture for one time on the same medium. When NaCl was included in the medium, shoots were formed in cluster and the shoot differentiation frequency was increased to 55.2%. The shoots were rooted when cultured on 1/2 MS medium supplemented with indole-3-butyric acid (IBA), kinetin (KN) and activated charcoal (AC). The results indicated that NaCl and TDZ played an important role in the improvement of the regeneration rate of the halophyte, S. europaea.£¨Author for correspondence. Tel: +86 (0)10 6283 6258; Fax: +86 (0)10 8259 6139; E-mail:yxli@ibcas.ac.cn£©
Abstract (Browse 2488)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Ethylene Production and 1-Aminocyclopropane-1-Carbo- xylate (ACC) Synthase Gene Expression in Tomato (Lycopsicon esculentum Mill.) Leaves Under Enhanced UV-B Radiation
Author: Lizhe An, Xiaofeng Xu, Hongguan Tang, Manxiao Zhang, Zongdong Hou,Yanhong Liu, Zhiguang Zhao, Huyuan Feng, Shijian Xu and Xunling Wang
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00331.x
      
    Tomato (Lycopsicon esculentum Mill.) plants grown in a greenhouse were irradiated with two different levels of UV-B, namely 8.82 (T1) and 12.6 kJ/m2 per day (T2). Ethylene production, 1-aminocyclopropane-1-carboxylate (ACC) content, 1-(malonylamino) cyclopvopane-1-carboxylic acid (MACC) content, gene expression of ACC synthase (EC 4.4.1.14), and ACC oxidase activity in tomato leaves were determined. The results indicated that ACC content, the activity of ACC synthase and ACC oxidase, and ethylene production increased continuously under low doses of UV-B radiation, whereas at high doses of radiation these parameters increased during the first 12 d and then started to decrease. The MACC content increased continuously over 18 d under both doses of UV-B irradiation. The changes in ACC content, ACC synthase activity, ACC oxidase activity, the transcriptional level of the ACC synthase gene, and ethylene production were consistent with each other, suggesting that ACC synthase was the key enzyme in ethylene biosynthesis and that ethylene production in tomato leaf tissues under UV-B radiation could be regulated by the expression of the ACC synthase gene. The results also indicate that the change in ethylene metabolism may be an adaptive mechanism to enhanced UV-B radiation.£¨Author for correspondence. Tel: +86 (0)931 891 2560; Fax: +86 (0)931 755 6069; E-mail: lizhean@lzu.edu.cn£©
Abstract (Browse 2385)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Floral Ontogeny of Two Species in Magnolia L.
Author: Feng-Xia Xu
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00341.x
      
    Floral ontogeny is described in two species of genus Magnolia (Magnoliaceae), Magnolia albosericea Chun et C. Tsoong, and M. amoena Cheng, representing subgenus Magnolia and subgenus Yulania in Magnolia, by using scanning electron microscope (SEM). The sequence of initiation of floral organs is from proximal to distal. The three distinct outermost and middle organs are initiated in sequence, but ultimately form a single whorl, thus their ontogeny is consistent with a sepal interpretation. The last three tepals (petals) alternate with the preceding tepal whorl. The members of androecium and gynoecium arise spirally, although the androecium shows some intermediacy between a spiral and whorled arrangement. The carpel primordia initiate in group of four to five. The order of stamen initiation within each tier is not determined. The floral ontogeny is remarkably homogeneous between the subgenus Magnolia and subgenus Yulania that does not support the resuming of genus Yulania.£¨Author for correspondence.Tel: +86 (0)20 3725 2661; Fax: +86 (0)20 3725 2831; E-mail: xfx@scib.ac.cn£©
Abstract (Browse 2442)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Identification and Mapping of Two New Genes Conferring Resistance to Powdery Mildew from Aegilops tauschii (Coss.) Schmal
Author: Xiao-Li Sun, Di Liu, Hai-Quan Zhang, Na-Xin Huo, Rong-Hua Zhou and Ji-Zeng Jia
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00328.x
      
    Two powdery mildew resistance genes were identified from Aegilops tauschii accessions Y201 and Y212 and mapped using two different F2 populations derived from the crosses between susceptible accession Y2272 and Y201, and susceptible accession Y2263 and Y212. Genetic analysis of resistance to powdery mildew indicated that the resistance of Y201 was controlled by a single dominant gene, whereas the resistance of Y212 was controlled by a single recessive gene. We have temporarily designated these genes as PmY201 and PmY212, respectively. By bulk segregation analysis, six microsatellite markers including Xgwm174, cfd26, cfd57, cfd102, Xgwm583 and Xgwm639 were found to be linked to PmY201 with genetic distances of 5.2, 7.7, 9.6, 12.5, 20.2 and 22.1 cM, respectively. Five SSR markers, including cfd57, Xgwm182, cfd7, cfd102, and cfd12, were found to be linked to PmY212 with distances of 5.6, 7.2, 11.5, 14.7, and 18.5 cM, respectively. According to the locations of the linked markers, the two resistance genes were located in the 5DL region. Based on the chromosomal locations and the resistance patterns of the two genes, we propose that PmY201 and PmY212 are two novel powdery mildew resistance genes, and are suitable for marker-assisted selection.£¨Author for correspondence. Tel(Fax): +86 (0)10 6218 6623; E-mail: jzjia@mail.caas.net.cn£©
Abstract (Browse 2374)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Creating Wheat Germplasm for High Quality Breeding by Monosomic Backcrossing
Author: Yan-Mei Wang£¬Jun Ji£¬ Dao-Wen Wang£¬Zheng-Bin Zhang£¬Ai-Min Zhang
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00343.x
      
    By crossing bread wheat cultivar GC8901 with the 1D monosonic line of Xiaoyan No. 6 and backcrossing the offspring with the Xiaoyan No. 6 1D monosonic line for 5 years, high-molecular-weight glutenin subunits 1Dx5+1Dy10 from GC8901 have been transferred into wheat cultivar Xiaoyan No. 6. The BC5F1 offspring lines had been detected by using methods of cytology, marker, molecular marker and six elite single plants with high molecular-weight glutenin subunits: 1Ax1, 1Bx14+1By15, 1Dx5+1Dy10 were identified. Those lines have high-yield potential with better agronomic characters and have been used in high quality wheat breeding processes as well.£¨Authors for correspondence. E-mails: zzb@ms.sjziam.ac.cn and amzhang@genetics.ac.cn£©
Abstract (Browse 2289)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Identification of Novel Stress-responsive Transcription Factor Genes in Rice by cDNA Array Analysis
Author: Cong-Qing Wu, Hong-Hong Hu, Ya Zeng, Da-Cheng Liang, Ka-Bin Xie,Jian-Wei Zhang, Zhao-Hui Chu and Li-Zhong Xiong*
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00305.x
      
    Numerous studies have shown that array of transcription factors has a role in regulating plant responses to environmental stresses. Only a small portion of them however, have been identified or characterized. More than 2 300 putative transcription factors were predicted in the rice genome and more than half of them were supported by expressed sequences. With an attempt to identify novel transcription factors involved in the stress responses, a cDNA array containing 753 putative rice transcription factors was generated to analyze the transcript profiles of these genes under drought and salinity stresses and abscisic acid treatment at seedling stage of rice. About 80% of these transcription factors showed detectable levels of transcript in seedling leaves. A total of 18 up-regulated transcription factors and 29 down-regulated transcription factors were detected with the folds of changes from 2.0 to 20.5 in at least one stress treatment. Most of these stress-responsive genes have not been reported and the expression patterns for five genes under stress conditions were further analyzed by RNA gel blot analysis. These novel stress-responsive transcription factors provide new opportunities to study the regulation of gene expression in plants under stress conditions.(Author for correspondence. Tel: +86 (0)27 8728 1536; Fax: +86 (0)27 8728 7092; E-mail: lizhongx@mail.hzau.edu.cn)
Abstract (Browse 2352)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
A Novel Approach to Functional Analysis of the Ribulose Bisphosphate Carboxylase Small Subunit Gene by Agrobacterium-Mediated Gene Silencing  
Author: Xiao-Fu Zhou, Peng-Da Ma, Ren-Hou Wang, Bo Liu and Xing-Zhi Wang
Journal of Integrative Plant Biology 2006 48(10): 1225-1232
DOI: 10.1111/j.1744-7909.2006.00320.x
      
    A novel approach to virus-induced post-transcriptional gene silencing for studying the function of the ribulose bisphosphate carboxylase small subunit (rbcS) gene was established and optimized using potato virus X vector and Nicotiana benthamiana as experimental material. The analysis of silencing phenomena, transcriptional level, protein expression, and pigment measurement showed that the expression of the rbcS endogenous gene was inactivated by the expression of a 500-bp homologous cDNA fragment carried in the virus vector. £¨Author for correspondence. Tel: +86 (0)431 509 9769; E-mail: xingzhi@public.cc.jl.cn£©
Abstract (Browse 2443)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Quantitative Trait Loci Mapping of Maize Yield and Its Components Under Different Water Treatments at Flowering Time  
Author: Gui-He Lu, Ji-Hua Tang, Jian-Bing Yan, Xi-Qing Ma, Jian-Sheng Li, Shao-Jiang Chen, Jian-Cang Ma, Zhan-Xian Liu, Li-Zhu E, Yi-Rong Zhang and Jing-Rui Dai
Journal of Integrative Plant Biology 2006 48(10): 1233-1243
DOI: 10.1111/j.1744-7909.2006.00289.x
      
    Drought or water stress is a serious agronomic problem resulting in maize (Zea mays L.) yield loss throughout the world. Breeding hybrids with drought tolerance is one important approach for solving this problem. However, lower efficiency and a longer period of breeding hybrids are disadvantages of traditional breeding programs. It is generally recognized that applying molecular marker techniques to traditional breeding programs could improve the efficiency of the breeding of drought-tolerant maize. To provide useful information for use in studies of maize drought tolerance, the mapping and tagging of quantitative trait loci (QTL) for yield and its components were performed in the present study on the basis of the principle of a mixed linear model. Two hundred and twenty-one recombinant inbred lines (RIL) of Yuyu 22 were grown under both well-watered and water-stressed conditions. In the former treatment group, plants were well irrigated, whereas those in the latter treatment group were stressed at flowering time. Ten plants of each genotype were grown in a row that was 3.00 m ¡Á 0.67 m (length ¡Á width). The results show that a few of the QTL were the same (one additive QTL for ear length, two additive QTL and one pair of epistatic QTL for kernel number per row, one additive QTL for kernel weight per plant), whereas most of other QTL were different between the two different water treatment groups. It may be that genetic expression differs under the two different water conditions. Furthermore, differences in the additive and epistatic QTL among the traits under water-stressed conditions indicate that genetic expression also differs from trait to trait. Major and minor QTL were detected for the traits, except for kernel number per row, under water-stressed conditions. Thus, the genetic mechanism of drought tolerance in maize is complex because the additive and epistatic QTL exist at the same time and the major and minor QTL all contribute to phenotype under water-stressed conditions. In particular, epidemic QTL under water-stressed conditions suggest that it is important to investigate the drought tolerance of maize from a genetic viewpoint.£¨Author for correspondence. Tel: +86 (0)10 62732571; E-mail: daijr@cau.edu.cn£©
Abstract (Browse 3693)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Overexpression of a Chloroplast-located Peroxiredoxin Q Gene, SsPrxQ, Increases the Salt and Low-temperature Tolerance of Arabidopsis
Author: Li-Wen Jing, Shi-Hua Chen, Xiao-Li Guo, Hui Zhang and Yan-Xiu Zhao
Journal of Integrative Plant Biology 2006 48(10): 1244-1249
DOI: 10.1111/j.1744-7909.2006.00357.x
      
    Abiotic stress, such as salt, drought and extreme temperature, can result in enhanced production of reactive oxygen species (ROS). Plants have developed both enzymatic ROS-scavenging and non-enzymatic ROS-scavenging systems. The major ROS-scavenging enzymes of plants include superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase (CAT), glutathione peroxidase (GPX) and peroxiredoxins (Prxs). In the present work, we identified a gene encoding chloroplast-located peroxiredoxin Q, SsPrxQ, from Suaeda salsa L. located at chloroplast. Overexpression of SsPrxQ in Arabidopsis leads to an increase in salt and low-temperature tolerance.
Abstract (Browse 2122)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
Iridoid Glycosides from Pedicularis dolichocymba Hand.-Mazz.
Author: Hong-Biao Chu¡¡and Ning-Hua Tan
Journal of Integrative Plant Biology 2006 48(10)
DOI: 10.1111/j.1744-7909.2006.00326.x
      
    During investigation of the chemical constituents of the whole plant ethanol extract of Pedicularis dolichocymba Hand.-Mazz. (Scrophulariaceae), four new iridoid glycosides, dolichocymbosides A (compound 1), B (compound 2), C (compound 3) and D (compound 4), were isolated. Their structures were determined based on spectral data including 1D and 2D-nuclear magnetic resonance spectroscopy (1H-1H COSY, HSQC, HMBC, ROESY) and FAB-MS. £¨Author for correspondence. Tel (Fax): +86 (0)871 5223 800; E-mail: nhtan@mail.kib.ac.cn£©
Abstract (Browse 2222)  |  References  |  Full Text HTML  |  Full Text PDF  |  Cited By       
 

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