Analysis of Physiological Characteristics of Heat Resistant Wheat

doi:10.7668/hbnxb.20191560

Abstract

Abstract: The purposes of this study were to determine the physiological mechanism of resistance improvement of heat-resistant varieties and to select simple heat-resistant evaluation indexes. Warming experiment was carried out in Gaocheng of Hebei Province from Autumn 2017 to Summer 2019 to study the effects of different warming treatments on the yield and physiological indexes of winter wheat under greenhouse warming and artificial climate chamber warming condition. The results showed that the thousand grain weight,grain yield and economic coefficient of Jimai 418 decreased under high temperature,but the reduce extent was smaller than that of Heng 4444 and Shannong 28,and the heat sensitive index of yield of Jimai 418 was significantly lower than 1,which belonged to heat resistant variety. The correlation analysis showed that the SPAD value,relative water content,photosynthetic rate and canopy temperature of flag leaf were significantly related to yield,the SPAD value and canopy temperature of flag leaf were also significantly correlated with the yield heat sensitivity index. The comprehensive high yield and heat tolerance which these indexes can be used as the reference index for heat-resistant variety selection. The physiological characteristics of heat resistant varieties were as follows:photosynthetic rate,SPAD value,relative water content and fluorescence parameters QY and Fv/Fm of flag leaf decreased slightly at high temperature,and the canopy temperature was lower as well,and the physiological activity of flag leaf was still high at late growth stage.

Key words: Winter wheat, Warming, Physiological index, Heat-resisting

CLC Number:

S512.01

Lü Lihua, LI Qian, LEI Mingshuai, YAO Yanrong, JIA Xiuling. Analysis of Physiological Characteristics of Heat Resistant Wheat[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(S1): 138-144. doi: 10.7668/hbnxb.20191560.

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