KANG Li-ping,ZHANG Lu.Effect of Water Stress on Photosynthetic Characteristics of Cowpea Seedlings[J].Northern Horticulture,2012,36(08):17-19.
水分胁迫对豇豆幼苗光合特性的影响
- Title:
- Effect of Water Stress on Photosynthetic Characteristics of Cowpea Seedlings
- 文章编号:
- 1001-0009（2012）08-0017-03
- Keywords:
- cowpea; water stress; photosynthetic characteristics
- 分类号:
- S 643.404+.3
- 文献标志码:
- A
- 摘要:
- 对四叶一心期的豇豆幼苗进行水分胁迫处理，研究其光合特性的变化。结果表明：随着胁迫时间的延长，土壤含水量、豇豆幼苗叶片含水量出现持续下降；气孔张开率、气孔导度、叶绿素含量出现持续下降趋势，到胁迫8 d后均与对照出现极显著差异；豇豆幼苗叶片胞间CO2浓度表现为为基本稳定、突然下降、再持续升高的趋势，胁迫8 d后为极显著差异；光合速率、蒸腾速率随胁迫时间延长出现持续下降趋势，蒸腾速率从胁迫4 d与对照出现显著差异，从6 d时开始出现极显著差异；光合速率则从6 d开始出现显著差异，从8 d开始出现极显著差异；光合速率与气孔张开率、气孔导度、叶片叶绿素含量成正相关，且与气孔张开率、气孔导度呈显著正相关；与胞间CO2浓度呈负相关。从相关性分析可以看出，气孔因素是影响光合速率的主要因素。豇豆幼苗忍耐自然水分胁迫时间为8 d。
- Abstract:
- The cowpea seedlings were treated when they had four leaves and a heart by water stress.The results showed that the soil water content and leaves water content continued to decrease,the stomata opening rate and stomata conductance continued to decrease too,and they were different from not treated significantly when stressed 8 days later,the chlorophyll content decreased and was different from not treatment significantly when stressed 8 days later，the intercellular CO2 concentration firstly was stable，then decreased,finally continued to increase，and was different from not treated significantly when stressed 8 days later,the transpiration rate and photosynthetic rate decreased continuously，the transpiration rate had remarkable difference from not treated when has been stressed for 4 days,while significant difference when has been stressed for 6 days,the photosynthetic rate had remarkable difference from not treated when has been stressed for 6 days,while significant difference when has been stressed for 8 days.The photosynthetic rate was positively related to stomata opening rate,stomata conductance and chlorophyll content,while was negatively related to intercellular CO2 concentration.It was concluded that stomata factor was the main factor effecting photosynthetic rate.The cowpea seedlings can endure water stressing for 8 days.
参考文献/References:
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备注/Memo
第一作者简介：康利平（1977-），女，硕士，讲师，现主要从事蔬菜栽培生理及生物技术方面的研究工作。E-mail：zhlklp@163.com。