二倍体小麦种间水分利用效率的差异及与根系生长的关系

提高作物水分利用效率(WUE)是当前半干旱地区农业研究的热点问题.利用管栽和田间干旱棚试验在两种土壤水分条件下,研究了5个不同二倍体小麦种WUE的差异及其与根系生长之间的关系.结果发现:两种水分条件下,不同二倍体小麦种间WUE存在显著差异,其从大到小的排列顺序为RR＞DD＞AA＞BB,说明R染色体组上可能存在控制高水分利用效率

Difference of Water Use Efficiency of Diploidy Wheat Species with Different Chromosome Set and Its Relationship with Root System Growth

To raise water use efficiency (WUE) of crop is a key problem in semi arid area agriculture. The present soil column and field shelter out rain experiment with 5 different dipolidy wheat species under two soil water conditions were designed to investigate the WUE difference of 5 different dipolidy wheat species and its relationship with root system growth. Experimental result showed that there was markedly difference of WUE among different dipolidy wheat species with different chromosome set. WUE of Frence rye (R chromosome set) was the largest and T. spelta (B chromosome set) was the least in all 5 dipolidy material under two water conditions. Root system growth and its profile distribution existed difference among various dipolidy wheat species with different chromosome set under two soil water conditions,the root growth of T. boeoticum and T. monococcum (A chromosome set) was the largest and Ae. Squarrosa (D chromosome set) was the least in all 5 material. There was a negative correlation between WUE and root system growth, WUE was reduced with the increase of root system growth (root system weight and root system length ) in all 5 dipolidy wheat. Therefore, it was an important measure rising WUE to reduce root system growth and to increase biomass production.