干旱条件下冬小麦近等基因系水分利用效率及其与气冠温差的关系

鉴定比较供体亲本京411和轮回亲本晋麦47及其34个近等基因系材料之间产量和水分利用效率(WUE),同时测定不同生育期的气冠温差(CTD),分析WUE在这些材料之间的变异范围,筛选WUE与轮回亲本显著差异的材料用于QTL定位,同时探索干旱条件下CTD与产量和WUE的关系及其随生育期进程变化的趋势。利用防雨棚和渗漏池开展模拟干旱试验。结果表明,34个近等基因系及其父母本WUE为1.30~1.92 kg/m~3,其中9个品系WUE显著低于轮回亲本晋麦47,表明WUE为多基因控制的数量性状,而且存在明显的加性效应。CTD与产量和WUE均呈极显著正相关关系。不同的是,随生育期进程推进,CTD与产量的相关性增强,在灌浆期最高,R2达到0.684 9,而与WUE的相关性减弱,R2在拔节-孕穗期最高,达到0.769 8。研究初步表明,CTD可以作为干旱条件下产量和WUE的鉴定指标。

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

Grain yield and water use efficiency(WUE)were determined by utilizing donor parent Jing 41 1 ,re-current parent Jinmai 47 and their 34 near isogenic lines(NILs)as research materials.In the meantime,the Cano-py-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 loca-tion,as well as exploring the relationship between CTD and yield as well as WUE under drought conditions.Simula-tion 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,indica-ting 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 be-tween 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.