小麦F2:3家系抗旱相关性状的遗传变异分析

在正常灌溉和干旱胁迫两种环境条件下种植以敏感型品种偃展2号和抗旱型品种石4185为亲本构建的402个F2:3家系群体.在正常灌溉和干旱胁迫两种环境条件下,应用该群体研究了株高、穗长、穗茎节长、旗叶长、旗叶宽、小穗数、单株穗数、单株穗粒数、单株穗粒重9个数量性状的遗传特点.结果表明:两种环境条件下,F2:3家系各性状分离明显,且基本符合正态分布,表现为数量性状遗传特点,是一个较为理想的QTL作图群体.但F2:3家系内各性状都存在不同程度的差异,单株穗数、单株穗粒数、单株稳粒重在正常灌溉和干旱胁迫两种条件下差异较大,表明受环境条件影响大.株高、穗长、穗茎节长在正常灌溉和干旱胁迫两种条件下差异较小,表明受环境条件影响小.

Genetic variation Analyse of drought-resistance traits with F2:3 family of wheat

Abstract: Four hundred and two F2:3 families, developed from the cross between drought -sensitive variety Yan Zhan 2 and drought-resistance wheat variety Shi 4185, were evaluated for its starch content in the replicated experiments under irrigated and dry land two environments. Based on the analysis of the F2:3 family, the genetic behaviors of 9 quantitative traits including plant height, spike length, in-ternodal length below spike , flag leaf width and area ,fertilized spikelet per spike,numbers of spike per plant, number of spike grains and weight of spike grains . The results revealed that there were obvious segregations for all traits among F2:3 family, under the condition of irrigated and dry land. All traits showed normal distributions.This reflected that this F2:3 family was suitable for QTL mapping for all plant traits. However, there were variations in F2:3 family for almost all traits.