全球水稻分子育种核心种质资源耐低钾品种的苗期筛选

以全球水稻分子育种计划提供的117份核心种质资源为供试材料,进行苗期水培试验,比较两种不同K 浓度处理下的苗期根茎性状表现.结果表明:两种处理条件下,品种间存在显著差异;以发根数、总根长、苗高、地下部干重、地上部干重等5个性状相对指数的平均值构成品种的综合指数,作为筛选耐低钾品种的评判标准,结合稻苗生长情况,从117份核心种质资源中筛选出9个耐低钾品种和32个较耐低钾品种.

Screening for Low-kalium Tolerance Varieties at Seedling Stage from the Core Germplasm of Integrated International Rice Molecular Breeding Program

Through hydroponic experiments with two different K concentrations, ten characteristics of 117 accessions of rice varieties provided by the Integrated International Rice Molecular Breeding Program were compared at the seedling stage. The result indicated that the seedling characteristics with low-kalium water culture were obviously different from those with regular-kalium water culture, and there were significant difference among 117 varieties in two different regimes. According to the synthetic appraisal index consisted of the relative indexes of number of root, total root length, overground weight, underground weight and seedling height, nine varieties with high tolerance to low-kalium and 32 variety with tolerance to low-kalium were screened out.