摘要
为了探究干旱胁迫及复水条件下,冬小麦叶片生理指标和光合特性的变化规律,选用‘济麦22’为研究对象,在拔节期开始时以正常补水量的80%、50%、25%和0%4个水平条件进行一次性灌水,之后不再补水,进入开花期后统一复水,并以正常灌溉管理的冬小麦作为对照,测定不同时段各处理冬小麦叶片抗氧化酶的活性、丙二醛(MDA)的含量,以及叶片的光合参数。结果表明,干旱胁迫条件下,冬小麦叶片超氧化物岐化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性和丙二醛(MDA)含量明显升高,冬小麦光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、细胞间隙CO_(2)浓度(Ci)和叶片水分利用效率(WUE)呈下降的趋势,气孔限制值(Ls)呈升高的趋势,并且干旱胁迫程度越重,变化幅度越大,在达到特旱条件时,SOD值、CAT值较其他处理略有降低,Ci值略有升高,Ls值略有降低。复水后的冬小麦产生补偿效应,干旱胁迫较轻的处理各项指标均能恢复到正常水平,而干旱胁迫较重的处理未能恢复到正常水平。
In order to explore the changes of physiological indexes and photosynthetic characteristics of winter wheat leaves under drought stress and rewatering,this study took"Jimai 22"as the research object,and conducted one-time irrigation at four levels of 80%,50%,25%and 0%of the normal water supplement at the beginning of jointing stage.After that,there was no water supplement,and rewatering was unified after entering the flowering stage.Taking winter wheat under normal irrigation management as the control,the activities of antioxidant enzymes,the content of malondialdehyde(MDA)and the photosynthetic parameters of winter wheat leaves were measured.The results showed that under drought stress,the activities of superoxide dismutase(SOD),peroxidase(POD),catalase(CAT)and malondialdehyde(MDA)in winter wheat leaves increased significantly,while the photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs),intercellular CO_(2) concentration(Ci)and leaf water use efficiency(WUE)decreased,The Ls value showed an upward trend,and the more severe the drought stress was,the greater the change range was.When the extreme drought conditions were reached,the SOD and CAT values slightly decreased compared to other treatments,the Ci value slightly increased,and the Ls value slightly decreased.After rewatering,winter wheat had a compensation effect.All indexes of the treatment with light drought stress could return to the normal level,while the treatment with heavy drought stress could not return to the normal level.
作者
崔兆韵
徐祎
邹俊丽
尹逊栋
江梦圆
CUI Zhao-yun;XU Yi;ZOU Jun-li;YIN Xun-dong;JIANG Meng-yuan(Key Laboratory for Meteorological Disaster Prevention and Mitigation of Shandong,Jinan 250031,China;Tai’anEcology and Agrometeorology Center,Tai’an 271000,Shandong Province,China;Tai’an AgrometeorologicalExperimental Station,Tai’an 271000,Shandong Province,China;Tai’an Academy of Agricultural Science,Tai’an271000,Shandong Province,China;Nanjing University of Information Science and Technology,Nanjing 210044,China)
出处
《节水灌溉》
北大核心
2023年第10期36-42,共7页
Water Saving Irrigation
基金
中国气象局创新发展专项农业气象试验站区域联合试验(CXFZ2021Z059)
“十三五”山东重大气象工程项目(鲁发改农经[2017]97号)
山东省气象局引导类项目“基于机器学习的冬小麦面积提取方法研究”(2021SDYD33)。
关键词
关键需水期
冬小麦叶片
水分胁迫
干旱胁迫程度
复水
水分利用效率
补偿效应
气孔限制
生理指标
光合特性
critical water demand period
winter wheat leaves
water stress
degree of drought stress
rewatering
water use efficiency
compensation effect
stomatal limitation
physiological indicators
photosynthetic characteristics
