CAI Xi-yue,CHEN Xiao-de,LIU Cheng,et al.Effect of Drought Stress with Exogenous Ca2+on Relative Water Content and the Characteristics of Photosynthesis of Koelreuteria paniculata[J].Northern Horticulture,2013,37(10):58-62.
外源钙对干旱胁迫下复羽叶栾树幼苗水分及光合特性的影响
- Title:
- Effect of Drought Stress with Exogenous Ca2+on Relative Water Content and the Characteristics of Photosynthesis of Koelreuteria paniculata
- 文章编号:
- 1001-0009(2013)10-0058-05
- Keywords:
- Koelreuteria bipinnata; drought stress; exogenous calcium; relative water content; photosynthesis
- 分类号:
- S 687.1
- 文献标志码:
- A
- 摘要:
- 以1 a生复羽叶栾树幼苗为试材，采用称重控水法模拟干旱，研究了外源钙处理对不同干旱胁迫条件下植物幼苗相对含水量、光合特性的影响。结果表明：经外源钙处理，有利于从整体上缓解干旱环境对幼苗的影响，保证植物在逆境中正常生长。对于相对含水量而言，胁迫越严重，下降的幅度越大；经外源钙处理，同一胁迫水平下幼苗相对含水量下降的幅度、速度均减小并且与无钙组同水平处理组均表现出显著性的差异，但并不能使相对含水量恢复到对照水平。植物一般采取低光合、低蒸腾、高水分利用效率的策略来适应干旱环境；通过外源钙处理，光合速率降低的速度及幅度减小，蒸腾作用进一步减小，同时减小了气孔导度的降低，并且提高了干旱条件下的水分利用效率。
- Abstract:
- Taking the seedlings of Koelreuteria bipinnata as material,weighing control water to simulate drought,the influence of exogenous calcium on relative water content and the characteristics of photosynthesis at different drought stress were studied.The results showed that processing of exogenous calcium was conducive to overall ease influence of seedlings in the arid environment，and to ensure the normal growth of the plants in the face of adversity.For the relative water content，the more serious the stress，the greater the falling.But,the same stress level with non calcium group,exogenous calcium treatment,the amplitude as well as speed of the drop of RWC reduced,and the RWC can not back to the control level in the calcium group.For the influence of the photosynthetic characteristics,seedlings took the strategy that lower photosynthetic，lower transpiration，higher water use efficiency to adapt to the drought environment.Through the exogenous calcium treatment，the speed and amplitude of photosynthetic rate reduction decreased，and further reduction of transpiration，at the same time the reduction of stomatal conductance was limited，and improved the water use efficiency at drought conditions.
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备注/Memo
第一作者简介：蔡喜悦(1986-)，男，硕士研究生，现主要从事应用生态学与植物生理生态学方面的研究工作。E-mail：caimingjun905@126.com.
责任作者：陈晓德(1955-)，男，硕士，副教授，硕士生导师，现主要从事应用生态学与植物生理生态学及生态修复与环境影响评价等方面的研究工作。E-mail：cxde@swu.edu.cn.
基金项目：国家星火计划资助项目(2006EA105025)。
收稿日期：2013-01-16