Photosynthetic Physiological Response Character of Different Maturity Maize Leaves to Heat Stress and Their Genotype Difference
YU Kangke
SUN Ningning
QI Hongzhi
ZHAN Jing
GU Haijing
LIU Gang
PAN Liwen
LIU Tianxue
Abstract：In order to explore the photosynthetic physiological response character to heat stress of maize leaves,the maize hybrids ZD958 and XY335 were used as materials,and heat stress was imposed from the 9th leaf stage to tasseling stage in 8:30-17:30 in the field conditions,the photosynthetic parameters,the activities of RuBPCase,PEPCase and sucrose phosphate synthase (SPS) were studied.The results showed that compared with control (normal condition),under heat stress,the leaf SPAD value decreased significantly except the juvenile leaf of ZD958,net photosynthesis rate (Pn),evaporation rate (Tr),and stomatal conductance(Gs) were decreased significantly with a larger reduction extent of maturity leaves than juvenile leaves,intercellular CO2 concentration(Ci) increased more in juvenile leaves than in maturity leaves,the maximum photochemical efficiency of PSⅡ was decreased with the juvenile leaves decreasing significantly,RuBPCase and SPS activities of maturity leaves of ZD958 and XY335 and the juvenile leaves of XY335 were decreased significantly,PEPCase activities of maturity leaves of ZD958 and the juvenile leaves of ZD958 and XY335 increased significantly.In conclusion,heat stress resulted in a significant decrease of photosynthesis capacity of maize leaves,and the influence of heat stress on maturity leaves was larger than that on juvenile leaves.ZD958 was more tolerant to heat stress than XY335.
Keywords：maizeheat stressleafphotosynthetic physiology
Publication Date：2017-05-02
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 34-38 )