Effect of low-nitrogen stress on photosynthesis and chlorophyll fluorescence characteristics of maize cultivars with different low-nitrogen tolerances

查看全文 作　　者：WU Ya-[1]wei;LI [2]Qiang;JIN [1]Rong;CHEN [1]Wei;LIU Xiao-[1]lin;KONG Fan-[1]lei;KE Yong-[1]pei;SHI [1]Haichun;YUAN Ji-[1]chao

机构地区：[1]Key Laboratory of Crop Ecophysiology and Farming System in Southwest China,Ministry of Agriculture/College of Agriculture,Sichuan Agricultural University,Chengdu 611130,P.R.China;[2]Chongqing Key Laboratory of Economic Plant Biotechnology/Collaborative Innovation Center of Special Plant Industry in Chongqing/Institute of Special Plants,Chongqing University of Arts and Sciences,Chongqing 402160,P.R.China

出　　处：《Journal of Integrative Agriculture》索引2019年第18卷第6期,共11页

基　　金：financially supported by the Sichuan Key Technology Support Program of China (2014NZ0040);the Special Fund for Agro-scientific Research in the Public Interest of China (20150312705) 摘　　要：Nitrogen(N)is a critical element for plant growth and productivity that influences photosynthesis and chlorophyll fluorescence.We investigated the effect of low-N stress on leaf photosynthesis and chlorophyll fluorescence characteristics of maize cultivars with difference in tolerance to low N levels.The low-N tolerant cultivar ZH311 and low-N sensitive cultivar XY508 were used as the test materials.A field experiment(with three N levels:N0,0 kg ha–1;N1,150 kg ha–1;N2,300 kg ha–1)in Jiyanyang,Sichuan Province,China,and a hydroponic experiment(with two N levels:CK,4 mmol L–1;LN,0.04 mmol L–1)in Chengdu,Sichuan Province,China were conducted.Low-N stress significantly decreased chlorophyll content and rapid light response curves of the maximum fluorescence under light(Fm′),fluorescence instable state(Fs),non-photochemical quenching(qN),the maximum efficiency of PSII photochemistry under dark-adaption(Fv/Fm),potential activity of PSII(Fv/Fo),and actual photochemical efficiency of PSII(ΦPSII)of leaves.Further,it increased the chlorophyll(Chl)a/Chl b values and so on.The light compensation point of ZH311 decreased,while that of XY508 increased.The degree of variation of these indices in low-N tolerant cultivars was lower than that in low-N sensitive cultivars,especially at the seedling stage.Maize could increase Chl a/Chl b,apparent quantum yield and light saturation point to adapt to N stress.Compared to low-N sensitive cultivars,low-N tolerant cultivars maintained a higher net photosynthetic rate and electron transport rate to maintain stronger PSII activity,which further promoted the ability to harvest and transfer light.This might be a photosynthetic mechanism by which low-N tolerant cultivar adapt to low-N stress. 关键词：MAIZE NITROGEN CHLOROPHYLL CONTENT PHOTOSYNTHESIS CHLOROPHYLL FLUORESCENCE characteristics

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Effect of low-nitrogen stress on photosynthesis and chlorophyll fluorescence characteristics of maize cultivars with different low-nitrogen tolerances

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