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KMID : 0368419680110010022
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Journal of Plant Biology
1968 Volume.11 No. 1 p.22 ~ p.26
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Physiological Activities Exerted by Various Growth Regulatiors, Ca and K ion on Elongation of Soybean Hypocotyl Segments
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Abstract
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Hrpocotyl segments of shade-grown soybean sprouts (var. Kumdo) were floated in solutions of various substances at physiological levels and grown for either 24 hours at 28℃ or 72 hours at 25℃.
Increased length of the segments beyond 20㎜ (the original length) was obtained as a measure of the present studies.
At the room temperature, Ca and DNP strong1y inhibited elongation of the hypocotyl segments, whereas K, IAA. GA and EDTA in general promoted it. There were, however, no such differences in the effects at relatively low temperature.
This indicated that the elongation process not only involves stretching of wall materials, but also does synthesis of the materials. Ca was found to be antagonistic to the promotive action of GA in the elongation, and the IAA action involves metabolic energy. EDTA seemed to act as a widely known chelator removing Ca already existed in the hypocotyl tissue, thus showed a promotion in the elongation.
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