小麦水分高效利用种质的筛选方法探讨

The Approach to the Screening Method of Wheat Germplasm with High Water Use Efficiency

讨论了抗旱性和水分高效利用的区别,认为可以用类似研究抗旱性的方法比较不同小麦种质的水分利用效率,筛选出具有水分高效利用特性的小麦种质。此方法引入了干旱产量指数、丰水产量指数和产量-水分高效利用指数的概念。通常具有水分高效利用特性(水高效)的小麦种质的干旱产量指数、丰水产量指数和产量-水分高效利用指数都应大于1.05;水分利用效率低(水低效)的种质的干旱产量指数、丰水产量指数和产量-水分高效利用指数都在0.95以下;其它属于水分利用中等效率(水中效)种质。通过新疆的抗旱鉴定试验和新春2号品种在生产实践中的抗旱性表现和水分高效利用特性,说明了该鉴定方法的适用性。

The difference between drought resistance and high water use efficiency was discussed in this paper. The methods used in studying drought resistance can be used to compare the water use efficiency of different wheat germplasm and screen the wheat germplasm with high water use efficiency. The concepts of drought yield index （DYI）, water yield index （WYI） and yield-high water use efficiency index （YHWUEI） were introduced. The DYI, WYI and YHWUEI of high water use efficiency germplasm were all more than 1.05,these of low water use efficiency germplasm were less than 0.95. The others belonged to medium water use efficiency germplasm.