作物学报2025，Vol.51Issue(4)：1091-1101,11.DOI:10.3724/SP.J.1006.2025.43032
盐胁迫对不同耐盐型玉米品种叶片光合性能和干物质积累与分配的影响
Effects of salt stress on photosynthetic performance and dry matter accumula-tion and distribution in leaves of different salt-tolerant maize varieties
摘要
Abstract
The effects of salt stress on photosynthetic performance,dry matter accumulation,and distribution characteristics in different salt-tolerant maize varieties were investigated to provide a theoretical basis for breeding salt-tolerant maize and optimiz-ing high-yield,stress-resistant cultivation in mildly and moderately saline-alkali soils.The experiments were conducted from 2022 to 2023 using the salt-tolerant maize variety Wansheng 69(WS69)and the salt-sensitive variety Denghai 605(DH605),with non-saline conditions as the control(CK).Two salt concentrations—low(1.5‰,MS)and high(3.0‰,HS)—were used to assess the effects of soil salinity on the material production performance of these maize varieties.Salt stress significantly reduced the leaf area index,chlorophyll content(SPAD value),and leaf photosynthetic potential of summer maize.Under high salt stress,the average photosynthetic rate(Pn),stomatal conductance(Gs),and transpiration rate(E)of DH605 and WS69 leaves decreased by 22.11%,19.99%,11.63%,and 13.51%,13.42%,8.81%,respectively,compared to CK,while the intercellular carbon dioxide concentration(Ci)increased by 19.83%and 10.79%.Salt stress also impeded dry matter accumulation in summer maize,signifi-cantly reducing plant biomass,the maximum growth rate(Wmax),and the maximum accumulation rate(Rmax),while increasing the number of days required to reach the maximum accumulation rate(Tmax).The proportion of dry matter accumulation after anthesis increased in salt-tolerant varieties but decreased in salt-sensitive varieties.Additionally,salt stress reduced the dry matter distribu-tion to reproductive organs,leading to yield reduction.Under MS and HS treatments,the average yield of DH605 was 16.12%and 27.42%lower than CK,respectively,while the yield of WS69 decreased by 6.90%and 9.12%.After salt stress,salt-tolerant varieties maintained higher leaf area indices,SPAD values,and photosynthetic potential,with less reduction in photosynthetic performance,which helped sustain the accumulation of photosynthetic products.Overall,salt stress significantly decreased dry matter accumulation and distribution to reproductive organs after anthesis,reducing the harvest index and ultimately resulting in lower yields.关键词
玉米/盐胁迫/叶片光合性能/干物质积累Key words
maize(Zea mays L.)/salt stress/leaf photosynthetic performance/dry matter accumulation引用本文复制引用
李雪婷,任昊,王洪章,张吉旺,赵斌,任佰朝,刘莹,姚海燕,刘鹏..盐胁迫对不同耐盐型玉米品种叶片光合性能和干物质积累与分配的影响[J].作物学报,2025,51(4):1091-1101,11.基金项目
本研究由山东省重点研发计划项目(LJNY202103),山东省现代农业产业技术体系建设项目(SDAIT-02-08),山东省重大科技创新工程计划项目(2021CXGC010804-05)和国家重点研发计划项目(2022YFD1201700)资助. This study was supported by the Key Research and Development Project of Shandong Province(LJNY202103),the Shandong Province Key Agricultural Project for Application Technology Innovation(SDAIT-02-08),the Major Scientific and Technological Innovation Project in Shandong Province(2021CXGC010804-05),and the National Key Research and Development Program of China(2022YFD1201700). （LJNY202103）
