February 1954, Volume 3 Issue 2

 

          Research Articles

Author:
Journal of Integrative Plant Biology 1954 3(2)
Abstract (Browse 1172)  |  Full Text PDF       
妞圾抉扭把抉扼批 妙抉把扳抉抖我折快扼抗抉抄 尿志抉抖抉扯我我 坏把快志快扼我扶抑 我 孜我抖抉忍快扶我我 妓我扼找快扶我抄
Author: 完.孚.尾抄
Journal of Integrative Plant Biology 1954 3(2)
Abstract (Browse 1947)  |  Full Text PDF       
Retardation of Abscission in Plants by Auxin-like Chemical and Related Physiological Effects
Author: C. H. Lou, L. F. Yeu, Li C. Tseng, L. M. Shao & F. G. Meng
Journal of Integrative Plant Biology 1954 3(2)
      
    Under natural habitation, many plants shed their leaves, fruits, and other parts as a means of protective adaptation to unfavorable conditions, as, for example, the autumn leaf fall of deciduous trees prior to-winter dormancy. Abscission also occurs in plant organs when their normal functioning can no longer be maintained. When the plant is under cultivation or when its product is in storage, it is often desirable to prevent its leaves or fruits from abscission. Premature or untimely abscission, such as the boll shedding in cotton, may bring serious losses to farm production. Shedding of leaves in Chinese cabbage during winter storage, preharvest drop of apples and oranges, etc. are problems of similar nature now confronting in our agriculture. It has long been known that auxin-like chemicals, when properly applied, are effective in retarding abscission in a variety of plants. In our present investivation, it has been shown that auxin-like chemicals, notably 2,4-D (2,4-dichloro-phenoxyacetic acid), are capable of retarding boll abscission in cotton and leaf shedding in Chinese cabbage; the following conclusions have been reached. Proper use of 2,4-D and other auxin-like chemicals on plants can delay the formation of the "separation layer" (proximal to the abscission layer in anatomy) at the base of the organ concerned, thus removing the apparent and immediate cause of abscission. Leaves, flowers, and bolls of cotton when treated with 2, 4-D remain firmly attached to the plant even after they were dead and dried up. The treated Chinese cabbage would not shed its leaves even though the leaf dlabes were rotten. In dose connection with its retarding effect in abscission, 2,4-D and related chemicals inevitably exert their influence on the plant as a whole. Sometimes, the dosage of 2,4-D, though it successfully retards abscission, may bring serious injury to the plant. In fact, the success of the chemical treatment in farm practice depends a great deal upon these related physiological effects. Different parts of a plant respond to the same treatment in different ways. The younger the tissue, the more susceptible it is to 2,4-D action. Generally speaking, at lower concentrations, the chemical promotes growth, increases the water-holding capacity and the solute content of the treated tissue; while, at higher concentrations, it begins to retard growth and induce malformations and sterility. It is proposed that, by applying smaller dosages of 2,4-D to the lower part of cotton at early stages of growth, flower and boll-shedding can be prevented; and, by applying larger dosages to the upper part at later stages, further undesirable growth of the top can be checked and the late "ineffective" flowers destroyed. As the effect of the-chemical can be converted from promotive to inhibitive with increasing dosage, and as its effect can be systemic, cumulative and retentive for a long period in the plants, it is important in experimentation not only to control the concentration of each application but also to ascertain the total amount of the effective dosage employed. On the basis of our previous and the present investigation, as well as the various reports appeared in the literature, the multiple action and opposite effects of 2,4-D and related chemicals on plants can be explained as follows: The chemical can penetrate into the cell, migrate among the tissue, and react specifically with the protoplasm. As a result of the chemical stimulation, the general metabolism of the affected tissue can be promoted or inhibited, as is evidenced by the corresponding rise and fall in aerobic respiration. Consequently, the various functionings then proceeding in the affected tissues can be correspondingly accelerated or retarded. Whether its action is promotive or inhibitive depends, on the one hand, upon the amount of the chemical present, and on the other, upon the functional state of the tissues in question, which changes steadily with plant development.
Abstract (Browse 2240)  |  Full Text PDF       
Physiological Studies in Bud and Boll Shedding of Cotton Plant
Author: C. C. King, T. S. Ni, Y. W. Tang, H. S. Lei, K. L. Sy, C. W. Cheng, C. L. Chang, K. W. Chow & S. F. Sui
Journal of Integrative Plant Biology 1954 3(2)
Abstract (Browse 1830)  |  Full Text PDF       
Intervarietal Grafting Hybridization in Tomato
Author: Shen Te-Su
Journal of Integrative Plant Biology 1954 3(2)
Abstract (Browse 2061)  |  Full Text PDF       
On the Cutting Back of the Flower Stem in Relation to the Head Formation of Cabbage
Author: Lee Shu-Hsien
Journal of Integrative Plant Biology 1954 3(2)
Abstract (Browse 1896)  |  Full Text PDF       
The Determination of Anti-bacterial Activity of Seventy Chinese Herbs
Author: Wang Yuen, Huang Erl-Siu, Wang Yu-Chin, Lin Yi-Min & Wu Ken-Tang.
Journal of Integrative Plant Biology 1954 3(2)
Abstract (Browse 1919)  |  Full Text PDF       
Studies on Chinese Sargassums, I. Sargassum Pallidum (Turn) Ag.
Author: C. K. Tseng & C. F. Chang
Journal of Integrative Plant Biology 1954 3(2)
Abstract (Browse 2029)  |  Full Text PDF       
The Economic Plants of Northern Sikang and Some Problems Relation to the Cultivation of Certain Plants
Author: Tsui You-Wen
Journal of Integrative Plant Biology 1954 3(2)
Abstract (Browse 1973)  |  Full Text PDF       
 

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