拔节期渍水对小麦籽粒品质相关性状的影响

为探讨拔节期渍害对小麦籽粒品质性状的影响,以34份小麦品种(系)为材料,比较了渍水处理和对照组的籽粒特性、面团流变学性状及溶剂保持力(SRC)的变化。结果表明,品种对所调查籽粒的品质性状、面团流变学特性及SRC均有显著或极显著影响,渍水处理对千粒重、峰值面积和峰值时间以及SRC有显著影响。渍水后,籽粒性状中的千粒重和硬度、面团流变学特性中的峰值面积和峰值时间分别较对照下降9.09%、3.76%、6.86%、7.49%,蔗糖SRC值和乳酸SRC值分别较对照降低2.68和4.39个百分点,差异达极显著水平。根据渍水前后的品质变化及相关性分析,上述性状中的千粒重、蔗糖SRC值和乳酸SRC值可以作为小麦品质耐渍性筛选指标。根据K-Means法统计供试小麦品种(系)耐渍性对品质影响的差异,发现宁麦9号、扬16-157、皖西麦7号和鄂麦6046品质耐渍性较好,可作为培育耐渍品种的亲本加以利用。本研究结果为小麦耐渍育种及渍害对小麦生长发育的影响提供了理论依据。

Effect of Jointing Waterlogging on Grain Quality in Wheat

In order to study the effect of waterlogging on wheat grain quality at jointing stage,34 wheat cultivars(lines)were used to compare the change of grain characteristics,dough rheological characteristics and Solvent Retention Capacity(SRC)between treatment group and control group.Results showed that wheat varieties had a highly significant effect on grain characteristics,dough rheological characteristics and SRC.Waterlogging treatment had a highly significant effect on 1000-grain weight,peak time,peak area and SRC.After waterlogging,1000-grain weight and grain hardness of grain characteristics,peak area and peak time of dough rheological characteristics decreased by 9.09%,3.76%,6.86%,7.49%,respectively,and SRC value of sucrose and lactate decreased by 2.68 and 4.39 percentage points,with significant or greatly significant differences between treatment and control.According to the quality changes and correlation analysis before and after waterlogging,1000-grain weight,sucrose SRC value and lactate SRC value can be used as indexes for screening waterlogging tolerance in wheat quality.According to cluster analysis of K-Means method for the differences of the effect of waterlogging tolerance on quality in wheat varieties(lines),Ningmai9,Yang16-157,Wanximai7 and Emai6046 had better waterlogging tolerance,which might be used as parents for breeding waterlogging tolerant varieties.The above results provided a theoretical basis for wheat waterlogging tolerance breeding and waterlogging influence on wheat growth.