April 1958, Volume 7 Issue 4

 

          Research Articles
Observations on Sexuality in Carica papaya L.Changes in Sexuality
Author: Hsu Ting-chung
Journal of Integrative Plant Biology 1958 7(4)
Abstract (Browse 1793)  |  Full Text PDF       
Observations on Sexuality in Carica papaya L.Female Plants
Author: Hsu Ting-chung
Journal of Integrative Plant Biology 1958 7(4)
Abstract (Browse 1829)  |  Full Text PDF       
ݧԧڧ֧ܧڧ ҧ֧ߧߧ ݧ ӧ֧ާ֧ߧߧ ڧߧ֧ܧ ڧܧѧ֧ާ ӧڧէ Liquidambar
Author: اѧ ٧ߧ -ާѧߧ
Journal of Integrative Plant Biology 1958 7(4)
Abstract (Browse 1872)  |  Full Text PDF       
Developmental Morphology and Histogenesis of Reproductive Structures of the Millet,Panicum Milliaceum L., I. DevelopmentaI Morphology of the Inflorescence and Flower
Author: Jing Zhi Lan
Journal of Integrative Plant Biology 1958 7(4)
      
    Developmental investigation of the panicle of the millet was carried out in the Department of Biology, Peking University in the years 1957 and 1958. This first report deals with the morphology of the development of the panicle. Observations were based on material dissected out under a binocular dissecting microscope. The vegetative shoot apex of the millet is in the form of a hemisphere. 14 or 15 and occasionally 16 leaves are produced when the vegetative apex is changed into the reproductive apex. During the transformation, the apex enlarges, increasing both in height and in diameter. But, unlike conditions obtaining in cereals such as the wheat, in the millet, height of the reproductive apex never exceeds its diameter. The first sign of initiation of the inflorescence is the appearance at the base of the shoot apex of a primordium of the bract which is rudimentary. In the axil of this rudimentary bract arises the axillary branch of the first order. The panicle of the millet is composed of branches of 5 successive orders. The formation of the first order branches is acropetal and in spirals. At the base of the axis, the axillary nature of the first order branches is clearly demonstrable. But the higher branches arise earlier and earlier in relation to the subtending bract. Thus, in the middle part of the axis, the primordium of the bract and that of the branch arise simultaneously, and towards the top the bract is so weakly developed that it is often hardly discernable. Branches of the second order arise laterally, right and left on those of the first order. From now on, the subtending bract no longer appears. Branches of the third, fourth and fifth orders arise respectively on those of the second, third and fourth orders. Spikelets are produced in the basipetal order. The first spikelet is formed at the tip of the main axis; later ones appear in succession at tips of branches of higher and higher order. Two florets are formed in each spikelet, but the first one degenerates. Thus, in each spikelet, only one grain matures. At flower initiation, the lemma appears first and then the primordium of the floret is formed in its axil. This supports the view that the lemma is in the nature of a bract subtending the flower, while the palaea is the first foliar member of the flower. In the development of the spikelets, the constituent parts develop in the following order: the outer glume, the inner glume, the lemma of the first floret, the primordium of the first floret, the lemma of the second floret and finally the primordium of the second floret. The order of the development of members of the flower is: the palaea, the stamens and the pistil and lastly the lodicules. The time-span for the development of different parts of the whole panicle is great. Thus, in an emergent panicle spikelets at various stages of development may be observed. At the top of the panicle the stamens and the pistil may be already differentiated; while at the lower part glume primordia may just begin to appear.
Abstract (Browse 2134)  |  Full Text PDF       
Comparative Studies on the Physiology of Lowland and Upland Rice I. On the Water Relation and Drought Resistance of Lowland Rice
Author: Yu Shu-veng, Chen Tsing-tsi and Liu Chung-tei
Journal of Integrative Plant Biology 1958 7(4)
      
    The purpose of the present investigation was to study the water relation and drought resistance of lowland and upland rice in various soil moisture conditions. The plants of two representative varieties Lao Lai Ching (lowland rice) and Nang Ton Xao (upland rice) were grown in pots with three different conditions; namely: 1. Flooded state with a water layer of 5 cm depth. 2. Moistened state with soil moisture amounting to 70%C75% of the full water-holding capacity. 3. Moistened state with soil moisture amounting to 45%C50% of the full water-holding capacity. The results obtained lead to the following conclusions: It seems that no intrinsic difference in the water relation exists between lowland and upland rice. Both varieties carry on their normal life activities in flooded condition. With regard to the adaptability to upland condition there are distinct differences between them. Cultivation in the moistened state without flooding leads to a poor yield of grain of both varieties, but the reduction in yield being greater in Lao Lai Ching. The yield of upland rice is not so much influenced by soil moisture as that of lowland rice. At droughty condition the growth of the upland rice plants far surpasses that of lowland ones, especially in the case of root-system. In upland condition the total water content of leaves is found to decrease, but the degree of decrease is rather greater in Lao Lai Ching than in Nang Ton Xao. Thus the water dificit of the former is somewhat larger than that of the later. The change of free water content shows the same tendency as the total water content, except that the difference between two varieties is still more significant. The free/bond water ratio of upland rice is also higher than that of lowland rice. In the case of decrease of soil moisture exomosis of electrolytes from leaves increased. However, upland rice is not so sensible to decrease of soil moisture in moistened state. The increase of exomosis owing to the scanty water supply is not so much in Nang Ton Xao as in Lao Lai Ching. This difference is more marked when exomosis was carried on at high temperature (50 ), which indicates that the heat resistance of upland rice is somewhat higher than that of lowland rice. The data presented here supports the suggestion of Prof. Ting, who believes that lowland and upland rice are two ecotypes produced by the edaphic conditions of lowland or upland in the region of cultivation. The relationship of the plant growth, drought resistance and the physiological indicators of water supply has been discussed.
Abstract (Browse 4949)  |  Full Text PDF       
ѧܧѧݧڧӧѧߧڧ ֧ߧڧ (ا - 2419) ڧ 3ѧ
Author: 10 -ӧߧ -ҧ ڧ ٧ -ا
Journal of Integrative Plant Biology 1958 7(4)
Abstract (Browse 1740)  |  Full Text PDF       
 

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