人工合成小麦幼苗耐低温特性鉴定

为了鉴定不同小麦品种的耐低温特性，筛选耐低温种质资源，本文以59个栽培二粒小麦/节节麦和硬粒小麦/节节麦人工合成小麦，在室温（18℃）和低温（4℃）处理下测定萌发15天的幼苗形态指标，采用性状相对值（各性状低温与室温下测定值的比值）和隶属函数法相结合的方法，综合评价人工合成小麦品种的抗低温特性。结果表明,栽培二粒小麦/节节麦人工合成小麦的耐低温特性总体较硬粒小麦/节节麦人工合成小麦强；筛选出一批耐低温特性强的栽培二粒小麦-节节麦人工合成小麦材料,可用于小麦耐低温育种。

Evaluation of low-temperature tolerant germplasm resource on seedling traits of synthetic hexaploid wheats

Synthetic hexaploid wheat from crossing tetraploid wheat （AABB） with Triticum tauschii （DD） possesses rich genetic diversities and elite genes for common wheat improvement. In order to evaluate the low-temperature tolerance of wheat varieties and to screen wheat germplasm resource of low-temperature tolerance. Fifty nine synthetic hexaploid wheats were used to investigate the morphologic traits of seedling （15d） at room temperature （18℃ ） and low temperature （4℃ ）, relative trait values （the ratios of trait values at low temperature to those at room temperature） and subordinate function values. The results showed that thelow-temperature tolerance in synthetics of Triticum dicoccum/Aegilops tauschii wheats was higher than that of Triticum duruml Aegilops tauschii. The germplasm with low-temperature tolerance could be used for wheatbreeding.