Changes of Photosynthetic Parameters in Wheat Flag Leaf and Their Correlation Analysis Under Post-anthesis High Temperature Conditions

doi:10.3321/j.issn:1000-7091.2003.03.003

Abstract

Abstract: Studies were carried out on changes of photosynthetic parameters in wheat flag leaf in the late stage under different high-temperature periods(HTP). The results indicated that post-anthesis high temperature stress (38℃,over 24 hours) induced significant decrease of net photosynthetic rate(Pn), transpiration rate (Tr), stomatal conductance(C), and water use efficiency (WUE) in the flag leaf, but significant increase of intercellular CO2 concentration(Ci)(all these F-values of photosynthetic parameters are significant at 0.001 level). Significant interaction effects were also found between HTP and days after treatment(DFT), which indicated that the photosynthetic parameters, such as Pn, E,C and WUE, decreased more seriously with the time going on. A close correlation existed between these photosynthetic parameters and the lipid peroxidation in plant leaf.Pn,Tr, C and WUE decreased obviously with the increase of plasm membrane permeability and the MDA content- a product of the lipid peroxidation in plant leaves. The negative correlation between Ci and Pn indicated that the decrease of Pn under high temperature stress was mainly caused by non-stomatal factors.

Key words: Winter wheat, High temperature stress, Photosynthetic parameters, Late development stage

CLC Number:

S511

WANG Chen-yang, ZHU Yun-ji, XIA Guo-jun, WANG Li-chen, WEI Li, SHI Xiu-li. Changes of Photosynthetic Parameters in Wheat Flag Leaf and Their Correlation Analysis Under Post-anthesis High Temperature Conditions[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2003, 18(3): 8-11. doi: 10.3321/j.issn:1000-7091.2003.03.003.

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