施氮对干旱胁迫紫苏叶绿素含量和光合作用的影响  

Effects of Nitrogen Application on Chlorophyll Content and Photosynthesis of Perilla Frutescens under Drought Stress

作　　者：赵永平 惠亚云 朱亚 赵盟 张毅 付献欧 马雪莉 ZHAO Yongping;HUI Yayun;ZHU Ya;ZHAO Meng;ZHANG Yi;FU Xian’ou;MA Xueli(College of Biology Pharmacy and Food Engineering,Shangluo University,Shangluo 726000,China)

机构地区：[1]商洛学院生物医药与食品工程学院

出　　处：《广东农业科学》2019年第10期63-68,共6页Guangdong Agricultural Sciences

基　　金：商洛市博士科技创新团队项目(SK2017-45);商洛学院高层次引进人才专项(14SKY027);陕西省大学生创新创业训练项目(201811396004)

摘　　要：【目的】初步明确氮素对干旱胁迫条件下紫苏叶绿素和光合作用的影响。【方法】采用盆栽试验,研究施氮对不同干旱胁迫处理不同品种紫苏叶绿素含量和光合指标变化的影响。【结果】各处理间叶绿素含量、光合速率、气孔导度、蒸腾速率和胞间CO2浓度差异显著,不同干旱胁迫条件下叶绿素含量均随施氮量的增加而升高,在轻度干旱胁迫处理施氮量超过300 kg/hm^2时,TD-S-1品种叶绿素含量呈现下降趋势,而LS-Y-1品种呈现继续升高的趋势。TD-S-1和LS-Y-1均在轻度干旱胁迫施氮量为300 kg/hm^2时,光合速率最大,较不施氮处理分别提高1.39倍和1.29倍,与气孔导度和蒸腾速率的变化趋势基本一致,而胞间CO2浓度均最低。【结论】轻度干旱胁迫条件下,施氮量达到300 kg/hm2对提高紫苏的光合作用具有一定的促进作用。【Objective】The effect of nitrogen on chlorophyll and photosynthesis of perilla frutescens under drought stress was preliminarily determine.【Method】The effects of nitrogen application on the chlorophyll content and photosynthetic index of different varieties of perilla frutescens under different drought stress were studied by pot experiment.【Result】The results showed that the chlorophyll content,photosynthetic rate,transpiration rate,stomatal conductance and intercellular CO2 concentration differed significantly under various drought stress conditions.The chlorophyll content were increased with the increase of N application.With N application amount of more than 300 kg/hm2 under mild drought stress treatment,chlorophyll content of TD-S-1 presented a downward trend,and that of LS-Y-1 continued to rise.TD-S-1 and LS-Y-1 had the highest photosynthetic rate when the nitrogen application amount was 300 kg/hm2 under mild drought stress,which was 1.39 times and 1.29 times higher than that without nitrogen application,respectively.The change trend of stomatal conductance and transpiration rate was consistent with that of photosynthetic rate,and the intercellular CO2 concentration was the lowest.【Conclusion】It can be concluded that under mild drought stress,nitrogen application of 300 kg/hm2 has a certain promoting effect on improving photosynthesis of perilla frutescens.

关 键 词：紫苏 施氮量 光合速率 气孔导度 蒸腾速率 胞间CO2浓度 干旱胁迫 

分 类 号：S143.1[农业科学—肥料学]