不同小麦品种旗叶叶绿素含量、叶片显微结构及产量对花后遮光的响应机制  

Effects of shading postanthesis on flag leaf chlorophyll content,leaf microstructure and yield of different wheat varieties

作　　者：李秀 李刘龙 李慕嵘 尹立俊 王小燕[1] LI Xiu;LI Liu-Long;LI Mu-Rong;YIN Li-Jun;WANG Xiao-Yan(Agricultural College of Yangtze University/Hubei Collaborative Innovation Center for Grain Industry/Hubei Key Laboratory of Waterlogging Disaster and Agricultural Use of Wetland,Jingzhou 434025,Hubei,China)

机构地区：[1]长江大学农学院/湿地生态与农业利用教育部工程研究中心/涝渍灾害与湿地农业湖北省重点实验室,湖北荆州434025

出　　处：《作物学报》2023年第1期286-294,共9页Acta Agronomica Sinica

基　　金：国家自然科学基金项目(31871578);国家重点研发计划项目(2016YFD0300107);湿地生态与农业利用教育部工程研究中心资助。

摘　　要：开花期至成熟期弱光是小麦生产中的环境胁迫之一,本研究以江汉平原大面积推广品种郑麦9023、襄麦55、扬麦158和扶麦1228为试验材料,研究弱光对小麦产量的影响及其适应机制。自开花期至成熟期进行遮光(AS),并以不遮光处理为对照(CK),测定了旗叶叶绿素含量、叶绿素a/b和叶片显微结构,以及耐弱光指标—超氧化物歧化酶活性、干物质量和产量等指标。结果表明,与对照相比,花后遮光导致各品种小麦旗叶SPAD值、超氧化物歧化酶活性、叶绿素a含量及叶绿素b含量升高,栅栏组织海绵组织厚度、叶片结构紧密度、干物质积累量和产量降低。不同小麦品种对花后弱光的响应表现不同,襄麦55和扬麦158旗叶叶肉细胞形态和分布受影响小于郑麦9023和扶麦1228。与郑麦9023和扶麦1228相比,襄麦55和扬麦158旗叶SPAD值、叶绿素a含量、叶绿素b含量和超氧化物歧化酶活性增幅较大,叶绿素a/b降幅较大。遮光处理下襄麦55(29%)和扬麦158(34%)减产幅度小于郑麦9023(38%)和扶麦1228(47%),表明襄麦55和扬麦158能够保持较高的产量,对弱光环境具有较高的适应性。能够保持较高的旗叶生理活性是襄麦55和扬麦158在光照不足环境下生产力高于郑麦9023、扶麦1228的生理基础。Low light from flowering to maturity is one of the environmental stresses in wheat production.In this study,four commercial varieties,Zhengmai 9023,Xiangmai 55,Yangmai 158,and Fumai 1228 from Jianghan Plain,were used to investigate the influence of low light on wheat yield and the mechanisms of plants’adaptation to low light.Shading(AS)treatments were started from flowering till maturity with normal light treatment as the control(CK).Traits monitored from flowering to maturity included chlorophyll contents,chlorophyll a/b and leaf microstructure in flag leaves,and low-light tolerance indicators of superoxide dismutase enzyme activity,dry matter,and yield.Results showed that compared with controls,shading postanthesis resulted in increasing SPAD value of flag leaf,superoxide dismutase(SOD)activity,chlorophyll a and chlorophyll b contents,decreased palisade tissue thickness of spongy tissue,tightness of leaf tissue structure,dry matter accumulation,and grain yield of all varieties.Varieties revealed different responses to low light treatment with the morphology and distribution of mesophyll cells of the flag leaf of Xiangmai 55 and Yangmai 158 being less affected than Zhengmai 9023 and Fumai 1228.Compared with Zhengmai 9023 and Fumai 1228,the SPAD value,chlorophyll a content,chlorophyll b contents,and superoxide dismutase activity of flag leaves of Xiangmai 55 and Yangmai 158 increased significantly,while the chlorophyll a/b decreased significantly.Shading treatment caused yield reductions were much less in Xiangmai 55(29%)and Yangmai 158(34%)than Zhengmai 9023(38%)and Fumai 1228(47%),indicating that Xiangmai 55 and Yangmai 158 were capable of maintaining high productivity resulted in a high level of adaptability to low-light environments.The ability to maintain a higher physiological activity of flag leaf was the major physiological mechnism for higher productivity of wheat under insufficient light conditions.

关 键 词：小麦 花后遮光 叶片显微结构 产量 

分 类 号：S512.1[农业科学—作物学]