干旱胁迫下腐植酸对燕麦叶绿素荧光特性的调控效应  

Regulatory Effect of Humic Acid on Chlorophyll Fluorescence Characteristics of Oat under Drought Stress

作　　者：李英浩 刘景辉[1] 赵宝平[1] 田露[1] 王琦[1] 朱珊珊 戴云仙[1] LI Yinghao;LIU Jinghui;ZHAO Baoping;TIAN Lu;WANG Qi;ZHU Shanshan;DAI Yunxian(Oat Scientific and Technical Innovation Team,Inner Mongolia Agricultural University,Hohhot 010019,China)

机构地区：[1]内蒙古农业大学杂粮产业协同创新中心,呼和浩特010019

出　　处：《灌溉排水学报》2020年第4期26-33,共8页Journal of Irrigation and Drainage

基　　金：燕麦种质资源引进与新品种选育(YZGC2017020);燕麦加工技术研究与旱作高产栽培示范推广项目;国家自然科学基金项目(31560373)。

摘　　要：【目的】明确腐植酸(HA)对干旱胁迫下燕麦叶片叶绿素荧光特性的调控效应。【方法】采用盆栽试验,研究了在正常供水(75%田间持水率)、中度干旱胁迫(60%田间持水率)、重度干旱胁迫(45%田间持水率)3个水分条件下喷施HA对燕麦叶片叶绿素量及荧光参数的影响。【结果】①水分胁迫导致Chla+Chlb、Chla/Chlb、Fm、Fv、Fv/Fm、Fv/Fo和qP显著降低,而Fo和NPQ显著升高;②与CK相比,干旱胁迫下HA处理Chla+Chlb提高0.6%~40.82%、Chla/Chlb提高1.13%~30.09%、Fm提高0.7%~121.19%、Fv提高1.0%~171.79%、Fv/Fm提高0.2%~83.89%、Fv/Fo提高1.9%~211.56%、qP提高0.1%~68.30%、NPQ提高6.02%~73.36%、而Fo降低0.70%~14.06%,其中在重度干旱胁迫下均达到显著差异。【结论】干旱胁迫对燕麦PSⅡ光反应系统产生明显伤害,喷施腐植酸可缓解其影响,且在重度干旱胁迫条件下效果最明显。Due to global climate change and the intensification of human activities, the water cycle conditions on the earth have undergone drastic changes, resulting in serious water problems and water environmental crisis in many regions and river basins. Water scarcity has become a bottleneck limiting sustainable agricultural development. Water is the main factor for crop production in semi-arid areas. Improving crop resistance and efficient use of water resources has become an inevitable choice for promoting sustainable agricultural growth in China’s arid regions. Oat is an herbaceous plant belonging to the genus Oataceae of the family Poaceae, which is highly resistant to stress. It is widely planted in barren, arid, cold and other areas, and is a crop for both food and feed. Oat has a developed root system, strong water absorption capacity, large root and shoot, and strong water regulation capacity, and has become a pioneer crop for land desertification control. Already studies have shown that drought stress can destroy many metabolic and physiological processes of plants. Drought stress will reduce plant biomass, reduce chlorophyll content, and change chlorophyll fluorescence parameters, while photosynthesis is one of the most important physiological processes that plants are inhibited under drought stress, but its complex and precise physiological and biochemical regulation process is not clear. The effect of water stress on plant photosynthesis can be studied by analyzing chlorophyll fluorescence kinetic parameters. Changes in chlorophyll fluorescence parameters of plant leaves can accurately measure the level of plant photosynthetic potential and the degree of damage. The application of chlorophyll fluorescence kinetics can deeply analyze the effects of environmental stress on plant photosynthetic apparatus, especially PSⅡ, and the adaptation mechanism of photosynthetic apparatus to environmental changes. Humic acid is a kind of organic substances formed by the microbial decomposition and transformation of ani

关 键 词：干旱腐植酸 燕麦 干旱胁迫 叶绿素 叶绿素荧光参数 

分 类 号：S158[农业科学—土壤学] S512.6[农业科学—农业基础科学]