中国农业科学2012，Vol.45Issue(23)：4947-4958,12.DOI:10.3864/j.issn.0578-1752.2012.23.023
花期前后高温对不同基因型玉米光合特性及产量和品质的影响
Effect of High Temperature During Flowering on Photosynthetic Characteristics and Grain Yield and Quality of Different Genotypes of Maize (Zea Mays L.)
摘要
Abstract
[Objective] The objective of this study was to identify exogenous spermidine on photosynthesis and chlorophyll fluorescence under high temperature treatments during flowering (0-8 d before silking and 0-8 d sifter silking). [Method] The heat-tolerant maize genotype XD20 and heat-sensitive maize genotype ZY309 were used in this study. Photosynthetic parameters, chlorophyll fluorescence variation, the activities of ribulose-l,5-bi-sphosphate carboxylase (PEPCase) and phosphoenolpyrovate carboxylase (RuBPCase) were investigated during flowering. [Result] The results showed that the heat-sensitive genotype got a significant reduction in grain yield with a more reduction rate under the treatment after flowering than before flowering. It was less affected for heat-tolerant genotype. SPAD, net photosynthetic rate (Pn), stomatal conductance (Gs), primarily photochemical efficiency (Fv/Fm), actual photochemical efficiency (OPSII), photochemical quenching (qP), PEPCase and RuBPCase activities of ear-leaves were reduced. But intercellular CO2 concentration (Ci), non-photochemical quenching (qN) were increased. [Conclusion] The results showed that there were significant effects of high temperature treatments during flowering on photosynthetic characteristics of summer maize, and the yield were significantly decreased. The heat-tolerant maize genotype has more photosynthesizing capacity and chlorophyll content than the heat-sensitive maize genotype.关键词
玉米/基因型/高温/产量/品质/光合特性Key words
maize/genotype/high temperature/yield/quality/photosynthetic characteristics引用本文复制引用
赵龙飞,李潮海,刘天学,王秀萍,僧珊珊..花期前后高温对不同基因型玉米光合特性及产量和品质的影响[J].中国农业科学,2012,45(23):4947-4958,12.基金项目
国家玉米产业技术体系专项资金(NYCYTX-02)、河南省重大公益性项目(091100910100)、国家公益性行业(气象)科研专项(GYHY201006041) （NYCYTX-02）
