摘要
以玉米品种浚单20为试验材料,采用盆栽方法,在4叶期开始水分处理,设CK(土壤相对湿度70%~80%)、持续淹水3、5、7 d和渍水5、10、15 d共7个处理,比较涝渍条件下不同叶龄叶片净光合速率、蒸腾速率、气孔导度、细胞间CO2浓度及SPAD值的变化。结果表明,苗期淹水和渍水均显著降低玉米叶片的SPAD值,淹水影响程度大于渍水,淹水7 d和渍水7 d时叶片的SPAD值分别比对照降低37.9%和3.3%。不同叶龄叶片的光合特性对涝渍响应存在差异,叶龄大的叶片抗涝渍能力相对较强。涝渍≤7 d时新出生的第5叶和第6叶的净光合速率、蒸腾速率和气孔导度显著下降;涝渍胁迫7 d时,渍水和淹水的净光合速率分别比CK降低18.5%和15.4%;渍水15 d时,第9叶的净光合速率比CK偏高6.1%,表明玉米对涝渍的适应性逐渐增加。
This paper deals with the differences in the responses of chlorophyll content and photosynthetic characteristics of maize seedling leaves at different foliar ages to waterlogging stress.A total of 7 water treatments,including CK,3,5 and 7 d of flooding and 5,10 and 15 d of waterlogging,for the tested maize cultivar XD20 began at the 4-leaf stage to make a comparative analysis of the changes in the net photosynthetic rate,transpiration rate,stomatal conductance,intercellular CO2 concentration and SPAD value of leaves at different foliar ages under waterlogging conditions.The results indicated that flooding and waterlogging at seedling stage significantly reduced the SPAD value of maize leaves,and flooding affected maize more greatly than waterlogging.The SPAD value of leaves after 7 d of flooding and 7 d of waterlogging was 37.9%and 3.3%lower respectively than CK.The photosynthetic characteristics of leaves at different foliar ages presented varied responses to waterlogging.When the number of waterlogging days was≤7 d,the net photosynthetic rate,transpiration rate and stomatal conductance of the new 5 th and 6 th leaf significantly dropped;after 7 d of waterlogging,the net photosynthetic rate of the waterlogged and flooded leaves was 18.5%and 15.4%lower respectively compared with CK;after 15 d of waterlogging,the net photosynthetic rate of the 9 th leaf rose by 6.1%compared with CK.
作者
余卫东
冯利平
胡程达
YU Wei-dong;FENG Li-ping;HU Cheng-da(China Meteorological Administration/CMA·Henan Key Laboratory of Agro-meteorological Support and Applied Technique,Zhengzhou 450003;College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193,China)
出处
《玉米科学》
CAS
CSCD
北大核心
2019年第5期73-80,86,共9页
Journal of Maize Sciences
基金
公益性行业(气象)科研专项(GYHY201006041)
“973”计划项目(2013CB430205)
关键词
玉米
涝渍
光合作用
光响应曲线
叶绿素
Maize
Waterlogging
Photosynthesis
Light response curve
Chlorophyll
