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首页> 外文期刊>Turkish Journal of Agriculture & Forestry >Tolerance and avoidance responses to salinity and water stresses in Calotropis procera and Suaeda aegyptiaca
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Tolerance and avoidance responses to salinity and water stresses in Calotropis procera and Suaeda aegyptiaca

机译：淡水Calotropis procera和埃及鳄盐碱胁迫对盐分和水分胁迫的耐受和回避响应。

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This study was designed to evaluate the response of 2 wild shrubs, Calotropis procera and Suaeda aegyptiaca, to salinity (100% seawater), drought, and waterlogging stresses. The 90-day-old plants were subjected to the stress treatments for 3 weeks, and growth and some physiological parameters were evaluated. The total plant dry mass of C. procera plants was reduced by 40%, whereas S. aegyptiaca was not significantly affected by salinity stress. Water deficit and waterlogging stresses significantly reduced the total dry mass of both species. Under all conditions, the root/shoot ratio in C. procera was 3-fold higher than in S. aegyptiaca. All applied stresses markedly increased leaf shedding in C. procera plants only. These plants appeared to have a higher salinity and waterlogging stress intensity index as manifested by chlorophyll levels lower than those in S. aegyptiaca. Under all conditions, Na~+ levels of S. aegyptiaca were twice those of C. procera plants. All stresses reduced the K~+/Na~+ ratio in C. procera leaves. On the other hand, S. aegyptiaca plants were able to maintain this ratio near control levels under salinity and drought stresses. Consequently S. aegyptiaca leaves had higher partial osmotic pressure than C. procera. The proline and total free amino acids levels in C. procera were between 1.3- and 2-fold higher than in S. aegyptiaca. Among all amino acids, the common change in both species under all stresses was an accumulation of free proline and a decrease in methionine levels.The results revealed that the response of both species to salinity and water stresses included avoidance and tolerance mechanisms with some differences between them.
机译：这项研究旨在评估2种野生灌木calotropis procera和Suaeda aegyptiaca对盐度（100％海水），干旱和涝渍胁迫的响应。对90天大的植物进行胁迫处理3周，并评估其生长和一些生理参数。 C. procera植物的总植物干重减少了40％，而埃及沙门氏菌不受盐分胁迫的显着影响。水分缺乏和内涝胁迫显着降低了两个物种的总干重。在所有条件下，proc.procera的根/茎比均比埃及假单胞菌高3倍。所有施加的胁迫仅在proc.procera植物中显着增加了叶片脱落。这些植物似乎具有较高的盐度和涝渍胁迫强度指数，其叶绿素水平低于埃及埃及假单胞菌。在所有条件下，埃及埃及假单胞菌的Na〜+水平是proc.procera植物的两倍。所有胁迫均降低了proc。procera叶片的K〜+ / Na〜+比例。另一方面，在盐分和干旱胁迫下，埃及埃及沙棘植物能够保持该比例接近对照水平。因此，埃及埃及沙棘叶的部分渗透压要高于proc。procera。 proc.procera中的脯氨酸和总游离氨基酸水平比埃及埃及假单胞菌高1.3到2倍。在所有氨基酸中，两个物种在所有胁迫下的共同变化是游离脯氨酸的积累和蛋氨酸水平的降低。结果表明，两个物种对盐分和水分胁迫的响应包括回避和耐受机制，两者之间存在一些差异。他们。

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