Drought stress induced changes in some organic substances in nodules and other plant parts of two potential legumes differing in salt tolerance
Drought stress induced changes in some organic substances in nodules and other plant parts of two potential legumes differing in salt tolerance
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DOI：
10.1016/j.flora.2005.06.005
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发表时间：
2005-01-01
期刊：
影响因子：
1.9
通讯作者：
Iram, A
中科院分区：
文献类型：
--
作者：
Ashraf, M;Iram, A
以菜豆（Phaseolus vulgaris）和田菁（Sesbania aculeata）两种豆科植物为研究对象，通过温室试验研究了水分胁迫对根瘤及其他植物器官生长和代谢的影响，主要目的是探讨根瘤在耐旱性中的重要作用。对15天龄的普通杨和S. aculeata降低了两种植物的茎质量和根瘤质量，但在P.vulgaris中的降低比S.有刺的硝酸还原酶（NR）活性降低的程度，普通杨叶片和根瘤比S。有刺的可溶性蛋白质在根瘤中的分布。aculeata比P. vulgaris降低更多。水分亏缺使两种植物各部位游离氨基酸含量均增加，但紫花苜蓿叶片和根瘤中游离氨基酸含量的增加幅度大于紫花苜蓿。有刺的脯氨酸和甜菜碱等渗透保护物质在根瘤和其他部位增加较多。干旱胁迫下的针叶树结果表明，S.结果表明，耐盐的刺青冈比盐敏感的普通青冈表现出更强的耐旱性。抗旱性强。aculeata与根瘤数量和质量的较小减少、叶片和根瘤中硝酸还原酶的高活性、根和根瘤中游离脯氨酸的高积累以及根瘤中甘氨酸甜菜碱的高含量相关。(c)2005年Elsevier GmbH。All rights reserved.
A greenhouse experiment was conducted to assess the effect of water stress on growth and metabolic changes in nodules and other plant parts of two leguminous species, Phaseolus vulgaris and Sesbania aculeata, with the major objective that nodules play a vital role in drought tolerance. Imposition of water deficit conditions for 45 days to 15day-old plants of P. vulgaris and S. aculeata reduced shoot mass and nodule mass of both species, but the reduction was more pronounced in P. vulgaris than in S. aculeata. Nitrate reductase (NR) activity was reduced more in the leaves and nodules of P. vulgaris than in S. aculeata. Soluble proteins in the nodules of S. aculeata were more decreased as compared to that in P. vulgaris. Free amino acids increased in all parts of both species due to water deficit, but a higher increase was observed in leaf and nodules of P. vulgaris than in S. aculeata. Osmoprotectants such as proline and glycine betaine increased more in the nodules and other parts of S. aculeata under drought stress. In conclusion, S. aculeata (salt tolerant) showed a higher degree of drought tolerance than P. vulgaris (salt sensitive). Drought tolerance of S. aculeata was found to be associated with a smaller reduction in number and mass of root nodules, a high activity of nitrate reductase in leaves and nodules, high accumulation of free proline in roots and nodules, and high glycine betaine content in nodules. (c) 2005 Elsevier GmbH. All rights reserved.