渗透调节对缺水木豆(Cajanus cajan (L.) millsp.)叶片脱水耐性的贡献

D. J. Flower, M. M. Ludlow
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引用次数: 223

摘要

水分胁迫下的鸽子豌豆叶片在低水势条件下具有高水平的渗透调节。在受控环境中生长的植物中,研究了这种叶片脱水耐受性调节的可能贡献。不同土壤条件下植物截留水分对渗透调节的影响不同,导致叶片水势下降速率不同。在所有处理中,渗透调节水平与叶片水势呈负相关。此外,在任何特定水势下,经历快速胁迫发展的植物比经历缓慢胁迫发展的植物表现出更少的渗透调节。不同渗透调节水平的叶片在-3.4 ~ -6.3 MPa水势下死亡,但所有叶片在相对含水量相似(32%)时死亡。因此,叶片在相对含水量达到致死值时死亡,而不是在叶片达到致死水势时死亡。渗透调节有助于在叶片水势较低的情况下维持较高的相对含水量,从而延缓了致死相对含水量发生的时间,降低了叶片水势。本文讨论了渗透调节对水分胁迫下鸽豆叶片存活的影响。版权
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Contribution of osmotic adjustment to the dehydration tolerance of water‐stressed pigeon pea (Cajanus cajan (L.) millsp.) leaves
Abstract Water‐stressed pigeonpea leaves have high levels of osmotic adjustment at low leaf water potentials. The possible contribution of this adjustment of dehydration tolerance of leaves was examined in plants grown in a controlled environment. Osmotic adjustment was varied by withholding water from plants growing in differing amounts of soil, which resulted in different rates of decline of leaf water potential. The level of osmotic adjustment was inversely related to leaf water potential in all treatments. In addition, at any particular water potential, plants that had experienced a rapid development of stress exhibited less osmotic adjustment than plants that experienced a slower development of stress. Leaves with different levels of osmotic adjustment died at water potentials between –3.4 and –6.3 MPa, but all leaves died at a similar relative water content (32%). Consequently, leaves died when relative water content reached a lethal value, rather than when a lethal leaf water potential was reached. Osmotic adjustment delayed the time and lowered the leaf water potential when the lethal relative water content occurred, because it helped maintain higher relative water contents at low leaf water potentials. The consequences of osmotic adjustment for leaf survival in water‐stressed pigeonpea are discussed. Copyright
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