摘要
[目的]探究干旱胁迫对木豆光合及生理生化指标的影响，为水电边坡生态修复中的物种筛选、植被群落的重建提供参考。[方法]采用盆栽控水法进行干旱胁迫，测定木豆叶片净光合速率（Pn）、气孔导度（Gs）、蒸腾速率（Tr）、胞间CO2浓度（Ci）、水分利用效率（Pn／Tr）、丙二醛（MDA）含量、脯氨酸（Pro）含量和可溶性糖含量8个抗旱指标的变化。[结果]木豆幼苗受水分变化的影响显著，在干旱胁迫下Pn、Gs、Tr、Ci、Pn／Tr等光合指标均显著下降，表现出不利的负向生理生态学响应；木豆叶片MDA、Pro和可溶性糖含量均显著增加以有效应对干旱胁迫。[结论]木豆的抗旱能力较强，适应于干热地区的生态环境，是水电边坡治理与开发的优选灌木。
Abstract
Objective] To explore the effects of drought stress on photosynthesis,physiological and biochemical indices of Cajanus cajan,and to provide scientific references for species screening and community reconstruction in ecological restoration of hydropower slope.[ Method] Pot wa-ter control method was used for drought stress of C.cajan.Changes of net photosynthetic rate (Pn),stomatal conductance (Gs),transpiration rate (Tr),intercellular CO2 concentration (Ci),water use efficiency (Pn/Tr),malondialdehyde (MDA),proline (Pro) and soluble glucose con-tent were detected in C.cajan.[Result] C.cajan seedlings were greatly affected by the moisture change.Under drought stress,the Pn,Gs,Tr, Ci and Pn/Tr all significantly decreased,showing a negative photosynthetic response to the drought stress.MDA,Pro and soluble glucose content significantly increased,so as to effectively respond to drought stress.[ Conclusion] C.cajan has strong draught tolerance,can adapt to the ecolog-ical environment of dry-heat area.It is the optimal shrub to control degraded mountain land.
国家科技期刊平台
NSTL
维普
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