Water Use Efficiency of Winter Wheat Near Isogenic Lines and Its Relationship with Canopy-air Temperature Difference under Drought Conditions

doi:10.7668/hbnxb.2016.05.026

Abstract

Abstract: Grain yield and water use efficiency(WUE) were determined by utilizing donor parent Jing 411,recurrent parent Jinmai 47 and their 34 near isogenic lines(NILs) as research materials.In the meantime,the Canopy-air temperature difference(CTD) was also monitored,and the relationships between CTD and yield and WUE were analyzed for all the genotypes.The work mainly aimed at exploring the variation range of WUE in the tested genotypes,selecting the genotypes that significantly difference from the recurrent parent for quantitative trait location,as well as exploring the relationship between CTD and yield as well as WUE under drought conditions.Simulation experiment of drought was carried out with rain-shelter.The result indicated that WUE ranges within 1.30-1.92 kg/m³, for the 34 NILs and their parents,with 9 NILs significantly lower in WUE than the recurrent parent,indicating WUE is a trait of polygenic control with additive effect.There were extremely significant relationships between CTD and yield and WUE,though differing in the variation trends.With proceeding of growth period procession,the correlation between CTD and yield increases,reaching peak at grain filling stage(R²=0.684 9).While that between CTD and WUE decreases,peaking at jointing-booting stage(R²=0.769 8).The results suggested that CTD could serve as an index for identifying yield and WUE under drought conditions.

Key words: Canopy-air temperature difference (CTD), Yield, Water use efficiency (WUE), Near isogenic lines (NILs)

CLC Number:

HUANG Guirong, MEI Xurong, LIU Xiaoying, YAN Changrong, ZHANG Xinying, WANG Yajing, GU Fengxue, GUO Rui, ZHONG Xiuli. Water Use Efficiency of Winter Wheat Near Isogenic Lines and Its Relationship with Canopy-air Temperature Difference under Drought Conditions[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2016, 31(5): 174-179. doi: 10.7668/hbnxb.2016.05.026.

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