COMPARATIVE WATER RELATIONS OF PHASEOLUS-VULGARIS L AND PHASEOLUS-ACUTIFOLIUS GRAY
COMPARATIVE WATER RELATIONS OF PHASEOLUS-VULGARIS L AND PHASEOLUS-ACUTIFOLIUS GRAY
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DOI：
10.1104/pp.77.1.113
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发表时间：
1985-01-01
期刊：
影响因子：
7.4
通讯作者：
MARKHART, AH
中科院分区：
文献类型：
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作者：
MARKHART, AH
菜豆的叶面积扩展、干重和水分关系。和P.在温室的一个干燥循环中对尖叶灰分进行了比较，以了解有助于获得较好的抗旱性的特征。尖叶草。口吃OFP。尖叶植物的闭合水势远高于OFP。尖叶黄杨的根系穿透性更强，这也有助于其抗旱性的提高。无论是在水分充足还是在水分胁迫条件下，两种植物的根冠比都没有差异。两种植物的叶片渗透势也相似，在水分胁迫期间没有明显的渗透调节。这些结果表明，P。尖叶可以推迟脱水，并表明敏感的气孔和深入的根系是特征，如果加入到栽培豆类中，可能会提高它们的抗旱性。
Leaf area expansion, dry weight, and water relations ofPhaseolus vulgarisL. andP. acutifoliusGray were compared during a drying cycle in the greenhouse to understand the characteristics which contribute to the superior drought tolerance ofP. acutifolius. Stomates ofP. acutifoliusclosed at a much higher water potential than those ofP. vulgaris, delaying dehydration of leaf tissue.P. acutifoliushad a more deeply penetrating root system, which also contributes to its drought tolerance. Root-shoot ratios did not differ between the two species either under well watered or water stressed conditions. Leaf osmotic potential was also similar in the two species, with no apparent osmotic adjustment during water stress. These results indicate thatP. acutifoliuspostpones dehydration and suggest that sensitive stomates and a deeply penetrating root system are characteristics which, if incorporated into cultivated beans, might increase their drought tolerance.