摘要
对2472个来自不同核心种质资源库的代表性水稻品种进行了苗期耐低磷初选和复筛,并通过全生育期鉴定,研究了耐低磷水稻种质资源筛选的基本条件和指标。结果表明,采用两步筛选法,即苗期初筛和复筛,并通过全生育期产量验证,既可以获得典型耐低磷和低磷敏感水稻品种,又提高效率,吻合度达67%;在供试土壤有效磷含量小于5 mg/kg时,筛选密度为4株/600g土,设低磷水平为50 mg/kg(外加);分蘖数及其耐低磷指数(相对分蘖数)综合性较强,作为苗期筛选指标比较适宜;对于少数特殊的品种,它们在高磷和低磷处理时都没有分蘖,此时用干重耐低磷指数(相对干重)来衡量它们的耐低磷能力比较合适;全生育期验证以经济产量及其耐低磷指数(相对经济产量)为鉴定指标,其中有效穗对经济产量影响最大。
Screening and selecting typical low-P tolerant rice genotype was very important component of both theory and application study. A simple, intuitionistic and representative index was useful to reduce workload, and could increase the reliability in screening. In this study, 2472 cultivars from different gene bases screened at seedling stage and whole growing stage was used to examine the indexes for screening low-P tolerant rice genotypes. The results showed that using two steps screening, screening and rescreening at seedling only could obtain typical low-P tolerant rice genotypes, stage, combined with the verification for whole growing stages not but also increase screening efficiency with the anastomotic ratio of screening and rescreening equivalent to 67 %. Under the condition of available P content of tested soil being lower than 5 mg/kg, and screening density being four plants/600g soil, adopting P 50 mg/kg soil as low P limit; At seeding stage, tiller and its relative value were regard as the main indexes for evaluating rice with different P efficiency, and dry weight of shoot as the reference one. But at whole growing stage, grain yield and its relative value were the reliable verifying indexes, and effective head had decisive effect on grain yield.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2006年第5期642-648,共7页
Journal of Plant Nutrition and Fertilizers
基金
国家973项目"水稻重要新基因的发掘与有效利用研究"(G1998010204)资助
关键词
水稻
磷效率
筛选
指标
rice
P-efficiency
screening
index
