Latest Accepted Articles

  Editorial
Announcement: Changes in the JIPB Board
Author: Chun-Ming Liu
Online Date: May 18, 2017
DOI: 10.1111/jipb.12553
                     
      
    

As a journal run entirely by scientists from plant science community, JIPB has developed from a China-based national journal to an international one over the past decade. Serving as the JIPB Editor-in-Chief, I have witnessed the gradual elevation of the journal in terms of publication quality and international visibility. The SCI impact factor has markedly increased from 0.671 in 2007 to 3.993 in 2016. Meanwhile, the number of yearly downloads have drastically increased from 54,931 to over 175,000 and our ranking among the plant science journals worldwide has increased from 100th to 24th! Internationally, the subscriptions of JIPB currently includes 15,200 universities and research institutions.

Abstract (Browse 5)   |   Full Text
The plant vascular system II: From essential functions in resource allocation, inter-organ communication and defense, to evolution of the monocot cambium
Author: William J. Lucas and Chun-Ming Liu
Online Date: May 3, 2017
DOI: 10.1111/jipb.12551
                     
      
    

In this Special Issue, a focus is also placed on the role of the xylem as an essential conduit for the long-distance delivery of water and mineral nutrients from the soil to the vegetative (above-ground) regions of the plant. Xylem cells destined to form tracheids or vessel members, which will make up the conduit for this water and mineral transport from the roots to the shoots, undergo apoptosis, a process of programmed cell death. In their review, Venturas et al. (2017) provide an in-depth analysis of the processes underlying the passage of water through these mature, and thus, dead, xylem conducting cells. They elegantly describe the physics associated with this transport of water from the soil to the above-ground tissues and organs of the plant. A tensional gradient, within the water column, pulls the transpiration stream through the plant and Venturas et al. (2017) address the challenges that this presents to the plant, including the unthinkable, in that the water column can rupture, a process termed cavitation. The authors provide an up-to-date analysis of the debate as to how plants might refill such cavitated xylem cells, an important topic with respect to tissue hydraulics. This review closes with an insightful section on the impact of climate change on xylem function.

Abstract (Browse 65)   |   Full Text
  Special Issue: Plant Vascular Biology
Plant xylem hydraulics: What we understand, current research, and future challenges
Author: Martin D. Venturas, John S. Sperry and Uwe G. Hacke
Received: January 10, 2017         Accepted: March 9, 2017
Online Date: March 14, 2017
DOI: 10.1111/jipb.12534
                     
      
    

Herein we review the current state-of-the-art of plant hydraulics in the context of plant physiology, ecology, and evolution, focusing on current and future research opportunities. We explain the physics of water transport in plants and the limits of this transport system, highlighting the relationships between xylem structure and function. We describe the great variety of techniques existing for evaluating xylem resistance to cavitation. We address several methodological issues and their connection with current debates on conduit refilling and exponential shape vulnerability curves. We analyze the trade-offs existing between water transport safety and efficiency. We also stress how limited is the information available on molecular biology of cavitation and the potential role of aquaporins in conduit refilling. Finally, we draw attention to how plant hydraulic traits can be used for modeling stomatal responses to environmental variables and climate change, including drought mortality.

Abstract (Browse 97)   |   Full Text
  Letters to the Editor
Overexpression of GhFIM2 propels cotton fiber development by enhancing actin bundle formation
Author: Min Zhang, Li-Bo Han, Wen-Yan Wang, Shen-Jie Wu, Gai-Li Jiao, Lei Su, Gui-Xian Xia and Hai-Yun Wang
Received: April 7, 2017         Accepted: April 28, 2017
Online Date: May 5, 2017
DOI: 10.1111/jipb.12552
                     
      
    

Cell elongation and secondary wall deposition are two consecutive stages during cotton fiber development. The mechanisms controlling the progression of these two developmental phases remains largely unknown. Here, we report the functional characterization of the actin-bundling protein GhFIM2 in cotton fiber. Overexpression of GhFIM2 increased the abundance of actin bundles, which was accompanied with accelerated fiber growth at the fast-elongating stage. Meanwhile, overexpression of GhFIM2 could propel the onset of secondary cell wall biogenesis. These results indicate that the dynamic rearrangement of actin higher structures involving GhFIM2 plays an important role in the development of cotton fiber cells.

Abstract (Browse 50)   |   Full Text
Arabidopsis Forkhead-Associated Domain Protein 3 negatively regulates peroxisome division
Author: Mintu Desai, Ronghui Pan and Jianping Hu
Received: February 7, 2017         Accepted: March 21, 2017
Online Date: March 23, 2017
DOI: 10.1111/jipb.12542
                     
      
    

Peroxisomes are ubiquitous and dynamic eukaryotic organelles capable of altering their abundance in response to environmental and developmental cues, yet the regulatory mechanism of plant peroxisome division/proliferation is unclear. To identify transcriptional regulators of the peroxisome division factor gene PEX11b, we performed a nuclear pull-down experiment and identified Arabidopsis Forehead-Associated Domain Protein 3 (FHA3) as a novel protein that binds to the promoter of PEX11b. Our data supported the conclusion that, in contrast to the previously identified HY5 HOMOLOG (HYH) protein that promotes the transcription of PEX11b, FHA3 is a negative regulator of PEX11b expression and peroxisome division.

Abstract (Browse 130)   |   Full Text
  Cell and Developmental Biology
HP30-2, a mitochondrial PRAT protein for import of signal sequence-less precursor proteins in Arabidopsis thaliana
Author: Claudia Rossig, John Gray, Oscar Valdes, Sachin Rustgi, Diter von Wettstein, Christiane Reinbothe and Steffen Reinbothe
Received: February 16, 2017         Accepted: May 19, 2017
Online Date: May 22, 2017
DOI: 10.1111/jipb.12555
                     
      
    

Chloroplasts and mitochondria contain a family of putative preprotein and amino acid transporters designated PRAT. Here, we analyzed the role of two previously characterized PRAT protein family member, encoded by At3g49560 (HP30) and At5g24650 (HP30-2), in planta using a combination of genetic, cell biological and biochemical approaches. Expression studies and GFP tagging identified HP30-2 both in chloroplasts and mitochondria, whereas HP30 was located exclusively in chloroplasts. Biochemical evidence was obtained for an association of mitochondrial HP30-2 with two distinct protein complexes, one containing the inner membrane translocase TIM22 and the other containing an alternative NAD(P)H dehydrogenase subunit (NDC1) implicated in a respiratory complex 1-like electron transport chain. Through its association with TIM22, HP30-2 is involved in the uptake of carrier proteins and other, hydrophobic membrane proteins lacking cleavable NH2-terminal presequences, whereas HP30-2's interaction with NDC1 may permit controlling mitochondrial biogenesis and activity.

Abstract (Browse 5)   |   Full Text
  Plant-environmental Interactions
Unfolded protein response activation compensates ER-associated degradation deficiency in Arabidopsis
Author: Qingliang Li, Hai Wei, Lijing Liu, Xiaoyuan Yang, Xiansheng Zhang and Qi Xie
Received: February 17, 2017         Accepted: April 10, 2017
Online Date: April 18, 2017
DOI: 10.1111/jipb.12544
                     
      
    

Abiotic stresses often disrupt protein folding and induce endoplasmic reticulum (ER) stress. There is a sophisticated ER quality control (ERQC) system to mitigate the effects of malfunctioning proteins and maintain ER homeostasis. The accumulation of misfolded proteins in the ER activates the unfolded protein response (UPR) to enhance ER protein folding and the degradation of misfolded proteins mediate by ER-associated degradation (ERAD). That ERQC reduces abiotic stress damage has been well studied in mammals and yeast. However, in plants, both ERAD and UPR have been studied separately and found to be critical for plant abiotic stress tolerance. In this study, we discovered that UPR-associated transcription factors AtbZIP17, AtbZIP28 and AtbZIP60 responded to tunicamycin (TM) and NaCl induced ER stress and subsequently enhanced Arabidopsis thaliana abiotic stress tolerance. They regulated the expression level of ER chaperones and the HRD1-complex components. Moreover, overexpression of AtbZIP17, AtbZIP28 and AtbZIP60 could restore stress tolerance via ERAD in the HRD1-complex mutant hrd3a-2, which suggested that UPR and ERAD have an interactive mechanism in Arabidopsis.

Abstract (Browse 45)   |   Full Text
  Metabolism and Biochemistry
Phenolic metabolism and molecular mass distribution of polysaccharides in cellulose-deficient maize cells
Author: Mar®™a de Castro, Romina Mart®™nez-Rubio, Jos®¶ Luis Acebes, Antonio Encina, Stephen C. Fry and Pen®¶lope Garc®™a-Angulo
Received: March 30, 2017         Accepted: April 21, 2017
Online Date: May 5, 2017
DOI: 10.1111/jipb.12549
                     
      
    

As a consequence of the habituation to low levels of dichlobenil (DCB), cultured maize cells presented an altered hemicellulose cell fate with a lower proportion of strongly wall-bound hemicelluloses and an increase in soluble extracellular polymers released into the culture medium. The aim of this study was to investigate the relative molecular mass distributions of polysaccharides as well as phenolic metabolism in cells habituated to low levels of DCB (1.5 uM). Generally, cell wall bound hemicelluloses and sloughed polymers from habituated cells were more homogeneously sized and had a lower weight-average relative molecular mass. In addition, polysaccharides underwent massive cross-linking after being secreted into the cell wall, but this cross-linking was less pronounced in habituated cells than in non-habituated ones. However, when relativized, ferulic acid and p-coumaric acid contents were higher in this habituated cell line. Feasibly, cells habituated to low levels of DCB synthesized molecules with a lower weight-average relative molecular mass, although cross-linked, as a part of their strategy to compensate for the lack of cellulose.

Abstract (Browse 25)   |   Full Text
JA but not JA-Ile is the cell-nonautonomous signal activating JA mediated systemic defenses to herbivory in Nicotiana attenuata
Author: Tohir A. Bozorov, Son Truong Dinh and Ian T. Baldwin
Received: November 5, 2016         Accepted: April 17, 2017
Online Date: April 19, 2017
DOI: 10.1111/jipb.12545
                     
      
    

The whole-plant activation of defense responses to wounding and herbivory requires systemic signaling in which jasmonates (JAs) play a pivotal role. To examine the nature of the slower cell- nonautonomous as compared to the rapid cell-autonomous signal in mediating systemic defenses in Nicotiana attenuata, reciprocal stem grafting-experiments were used with plants silenced the JA biosynthetic gene ALLENE OXIDE CYCLASE (irAOC) or plants transformed to create JA sinks by ectopically expressing Arabidopsis JA-O-methyltransferase (ovJMT). JA-impaired irAOC plants were defective in the cell-nonautonomous signaling pathway but not in JA transport. Conversely, ovJMT plants abrogated the production of a graft-transmissible JA signal. Both genotypes displayed unaltered cell-autonomous signaling. Defense responses (17-hydroxygeranyllinalool diterpene glycosides, nicotine and proteinase inhibitors) and metabolite profiles were differently induced in irAOC and ovJMT scions in response to graft-transmissible signals from elicited wild type stocks. The performance of Manduca sexta larvae on the scions of different graft combinations was consistent with the patterns of systemic defense metabolite elicitations. Taken together, we conclude that JA and possibly MeJA, but not JA-Ile, either directly functions as a long-distance transmissible signal or indirectly interacts with long distance signal(s) to activate systemic defense responses.

Abstract (Browse 46)   |   Full Text
  Molecular Ecology and Evolution
The circadian clock component, LHY, tells a plant when to respond photosynthetically to light in nature
Author: Youngsung Joo, Variluska Fragoso, Felipe Yon, Ian T. Baldwin and Sang-Gyu Kim
Received: January 25, 2016         Accepted: April 18, 2017
Online Date: April 21, 2017
DOI: 10.1111/jipb.12547
                     
      
    

The circadian clock is known to increase plant growth and fitness, and thought to prepare plants for photosynthesis at dawn and dusk; whether this happens in nature was unknown. We transformed the native tobacco, Nicotiana attenuata to silence two core clock components, NaLHY (irLHY) and NaTOC1 (irTOC1). We characterized growth and light-and dark-adapted photosynthetic rates (Ac) throughout a 24 h day in empty vector-transformed (EV), irLHY, and irTOC1 plants in the field, and in NaPhyA-and NaPhyB1-silenced plants in the glasshouse. The growth rates of irLHY plants were lower than those of EV plants in the field. While irLHY plants reduced Ac earlier at dusk, no differences between irLHY and EV plants were observed at dawn in the field. irLHY, but not EV plants, responded to light in the night by rapidly increasing Ac. Under controlled conditions, EV plants rapidly increased Ac in the day compared to dark-adapted plants at night; irLHY plants lost these time-dependent responses. The role of NaLHY in gating photosynthesis is independent of the light-dependent reactions and red light perceived by NaPhyA, but not NaPhyB1. In summary, the circadian clock allows plants not to respond photosynthetically to light at night by anticipating and gating red light-mediated in native tobacco.

Abstract (Browse 64)   |   Full Text
Natural hybridization and reproductive isolation between two Primula species
Author: Yanping Xie, Xingfu Zhu, Yongpeng Ma, Jianli Zhao, Li Li and Qingjun Li
Received: March 28, 2017         Accepted: April 17, 2017
Online Date: April 21, 2017
DOI: 10.1111/jipb.12546
                     
      
    

Natural hybridization frequently occurs in plants and can facilitate gene flow between species, possibly resulting in species refusion. However, various reproductive barriers block the formation of hybrids and maintain species integrity. Here, we conducted a field survey to examine natural hybridization and reproductive isolation (RI) between sympatric populations of Primula secundiflora and P. poissonii using ten nuclear simple sequence repeat (SSR) loci. Although introgressive hybridization occurred, species boundaries between P. secundiflora and P. poissonii were maintained through nearly complete reproductive isolation. These interfertile species provide an excellent model for studying the RI mechanisms and evolutionary forces that maintain species boundaries.

Abstract (Browse 68)   |   Full Text

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