Response of leaf photosynthesis characteristics and yield of maize hybrids differing in drought tolerance to drought stress

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摘要：

以耐旱性具有显著差异的2个玉米品种郑单958(耐旱性强)和驻玉309(耐旱性弱)为材料开展旱池控水试验,研究了正常灌溉(W1)和干旱胁迫(W2)对14叶展、吐丝期和乳熟期叶片光合参数及产量的影响.W1处理下,叶片光合速率(Pn)、气孔导度(Gs)、最大光化学效率(Fv/Fm)、实际光量子产量(ΦPSII)和叶绿素含量(SPAD)的品种间差异较小.W2处理下郑单958有较高的Pn,Gs和SPAD,分别比驻玉309高约10%、14%和5%,Fv/Fm的品种间显著差异仅出现在吐丝期,表现为郑单958高于驻玉309,而各生育期ΦPSII品种间差异均不显著.与W1相比,W2处理产量与叶片各生理性状的相关性更强,W1和W2处理下,产量与各指标平均值均呈正相关关系,且与ΦPSII的相关性最强.综上所述,与驻玉309相比,郑单958叶片光合生理性状在干旱胁迫下表现出较强的适应能力,这可能是郑单958耐旱性强的主要生理原因.

The experiment was carried out to study leaf photosynthesis characteristics and grain yield of maize under well water(W1)and water stress(W2)at different growth stages(V14,silking,milk-ripe stage).Two hybrids with different drought tolerance were used in this study,which were Zhengdan 958(drought-tolerance hybrid)and Zhuyu 309(drought-sensitive hybrid).There were littler difference in net photosynthesis(Pn),stomatal conductance(Gs),Efficiency of light energy transformation of photosystem Ⅱ(Fv/Fm),quantum efficiency of photosystem Ⅱ(ΦPSⅡ),SPAD value between hybrids under W1 treatment.However,Zhengdan 958 showed greater Pn,Gs,and SPAD,compared with Zhuyu 309 under W2,which were about 10%,14%,and 5%higher,respectively.Also,significant difference was detected in Fv/Fmbetween hybrids only at silking under W2,and Fv/Fmwas higher for Zhengdan 958 than for Zhuyu 309 in this stage.Moreover,there was no significant difference inΦPSⅡ between hybrids under W2 at each growth stage.Correlation analysis shows that there were strong relationships among grain yield and measured traits under water stress compared with under well water conditions,and under both W1 and W2 treatments,the relationships among grain yield and average traits(across three growth stages)were correlate positively,and among the measured traits,ΦPSⅡ always showed strong correlation with grain yield.The results revealed that,relative to Zhuyu309,leaf photosynthesis characteristics of Zhengdan 958 showed strong adaptive capacity to water stress,ant this may be the main physiological reason for the strong drought tolerance of Zhengdan 958.

作者：

蒿宝珍马静丽董嘉强王春艳敖彦文王小洁王书丽孙莉萍赵红艳姜丽娜

Hao Baozhen;Ma Jingli;Dong Jiaqiang;Wang Chunyan;Ao Yanwen;Wang Xiaojie;Wang Shuli;Sun Liping;Zhao Hongyan;Jiang Lina(School of Life Science and Basic Medicine,Xinxiang University,Xinxiang 453003,China;College of Life Sciences,Henan Normal University,Xinxiang 453007,China)

机构地区：

新乡学院生命科学与基础医学学院 betway官方app 生命科学学院

出处：

《betway官方app 学报：自然科学版》 CAS 北大核心 2022年第6期29-36,I0002,共9页

Journal of Henan Normal University(Natural Science Edition)

基金：

河南省自然科学基金面上项目(212300410380) 河南省科技攻关计划项目(202102110168) 国家重点研发计划项目(2017YFD0301101,2018YFD0300705).

关键词：

玉米干旱胁迫耐旱性光合特性产量

maize drought stress drought-tolerance photosynthesis characteristic grain yield

分类号：

S513 [农业科学—作物学]