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KMID : 0368419810240020061
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Journal of Plant Biology
1981 Volume.24 No. 2 p.61 ~ p.72
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Effects of Water Stress on Leaf Growth, Leaf Diffusive Resistance and Net Photosynthetic Rate in Snapbean (Phaseolus unlgaris L.)
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Suh Kye-Hong
Kim Joon-Ho
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Abstract
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Effects of water stress on leaf growth, leaf diffusive resistance and net photosynthetic rate were studied on the first trifoliate leaves of snapbean(Phaseolus vulgaris L.) grown under controlled environmental conditions in a growth cabinet. As the drying cycle progressed, leaf water potential, relative water content and the net photosynthetic rate were decreased, but the leaf diffusive resistance was increased. Leaf growth in the elongation and the area was the most sensitive, but the net photosynthetic rate was the least sensitive to water stress. The grade of the leaf photosynthetic rate was the least sensitive to water stress. The grade of the leaf diffusive resistance after recovery was not affected by the different degrees of water stress experienced during the drying cycle but the recovering time attained to the control level was delayed. The leat diffusive resistance was not affected at leaf water potential above -8 bars, but increased rapidly below that value.
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