摘要
玉米热带种质在具有诸多育种优势性状的同时,具有籽粒脱水较慢的不足。利用温带种质改良热带材料的籽粒脱水性状已经成为育种者关注的焦点之一。本研究以温带玉米自交系HCL645和热带玉米自交系ZHL908所组配的105个F2:3家系为材料,通过对F2:3分离家系在授粉后不同时期的籽粒含水量的测定,计算相关的籽粒脱水速率,评价后代的籽粒含水量相关性状的变异情况,揭示温热玉米种质改良过程中的籽粒含水量变化类型和改良方向。结果表明,温热改良F2:3家系的籽粒含水量呈下降趋势,拟合方程为y=-17. 9 In(x)+47. 83,其中R2=0. 987。相关的籽粒脱水速率表现为逐渐减小,拟合方程为y=-1. 22 In(x)+1. 980,其中R2=0. 978。这些研究结果将为热带玉米种质改良和利用提供一定的支持依据。
Tropical maize germplasm plays an important role in current breeding practice because it has advantage in yield related traits.However,one disadvantage of tropical germplasm is its slower kernel dehydration.The use of temperate germplasm to improve the dehydration traits of tropical materials has become one of the focus of breeders.In this study,105 F2: 3progeny of the temperature maize inbred line HCL645 and the tropical maize inbred line ZHL908 were used as materials.The kernel moisture content of the F2: 3progeny at different stages after pollination was measured and the related kernel dehydration rate was calculated.The variation of kernel moisture content-related traits in offspring was evaluated and the temperature-heat effect was investigated.The types and improvement direction of kernel moisture content in maize germplasm improvement process were examined.The results showed that the kernel moisture content of F2: 3progeny decreased responding to the increasing of time after pollination,with fitted equation to be y =-17. 9 In( x) + 47. 83,R2=0. 987,and the kernel moisture content generally descended.The kernel dehydration rate of F2: 3progeny also decreased along with the increasing of time after pollination,with fitted equation to be y =-1.22 In( x) +1. 980,R2= 0. 978,and the kernel dehydration rate is generally reduced. These results would provide some useful evidence for the improvement of tropical maize germplasm in future maize breeding practice.
作者
吴文强
吴迅
郭向阳
王安贵
陈泽辉
ZHAO Qiang
WU Wen-qiang;WU Xun;GUO Xiang-yang;WANG An-gui;CHEN Ze-hui(College of Agriculture,Guizhou University,Guiyang,Guizhou 550025,China;Upland Crops Institute,Guizhou Academy of Agricultural Sciences,Guiyang,Guizhou 550006,China)
出处
《山地农业生物学报》
2018年第6期76-79,共4页
Journal of Mountain Agriculture and Biology
基金
黔农科院自主创新科研专项字(2014)006
黔农科院产业扶贫(2018)02号
黔科合支撑[2016]2549
黔科合重大专项[2013]6022
黔科合人才团队[2014]4024号
黔科合基础[2017]1413
黔科合支撑[2017]2507
黔科合支撑[2018]2296号
黔科合支撑[2017]2504-1
关键词
温热玉米种质
温带玉米种质
籽粒含水量
籽粒脱水速率
tropical maize germplasm
temperature maize germplasm
kernel moisture content
kernel dehydration rate
