不同发育时期水稻强、弱势粒灌浆速率的遗传分析
首发时间:2006-03-09
摘要:以含有新株型稻的三个不育系、两个恢复系为试材,采用NC-Ⅱ设计,应用朱军提出的胚乳性状条件遗传方差分析方法,研究水稻强、弱势粒灌浆速率的遗传规律。结果表明,强势粒以VG为主。其中前期最大,且以胚乳效应为主;中后期以细胞质效应、母体效应为主。各条件方差分量表达时效性为VA(t∣t-1)在前期、中期表达;VC(t∣t-1)在中、后期表达;VAm(t∣t-1)在全灌浆期间都有不同程度的表达;VDm(t∣t-1)主要在前期表达。弱势粒只在中期VG大于VGE,仍以胚乳效应为主,表明其受环境影响较重。基因效应表达的时效性特征是,前期VD(t∣t-1)、VAm(t∣t-1)显著表达,以VAm(t∣t-1)为主,但VAm(t∣t-1)小于同时期表达的VAE(t∣t-1);进入中期后,以VA(t∣t-1)最大,其次为VAm(t∣t-1)。后期以VCE(t∣t-1)为主。弱势粒条件方差分析结果与方差分析结果在中后期存在明显矛盾。
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Genetics of Grain Filling Rate in Different Growth Stages of Superior and Inferior Grains in Rice
Abstract:Zhu`s genetic model of endosperm characters and statistical approaches of conditional genetic variances were used to analyze the genetic regulations of grain-filling rate for inferior and superior grains of rice including three NPT sterile lines and two restoring lines with NC-Ⅱdesign. The results showed that for the superior grains, VG was the main variance component, highest in the early stage. Endosperm effect was the major form in the early stage, and cytoplasmic and maternal effects were more important in the middle and late stages. The active time for each conditional variance component was VA(t∣t-1)in the early and middle stages, VC(t∣t-1) in the middle and late stages , VAm(t∣t-1) in the whole filling stage and VDm(t∣t-1) mainly in the early stage. For the inferior grains, only in the middle stage VG was more than VGE, and the main variance component was also from endosperm variances. This result indicated that the inferior grains were more likely to be influenced by environments. The expressing characters of gene effects were: VD(t∣t-1) and VAm(t∣t-1))expressing significantly in the early stage and VAm(t∣t-1) being more important; VAm(t∣t-1) being less than VAmE(t∣t-1). In the middle stage , VA(t∣t-1)became the most important variance and VAm(t∣t-1)was the second. In the late stage VCE(t∣t-1)became the main variance component. The results between conditional variance analysis and variances analysis of inferior grains were conflicting.
Keywords: Japonica Filling rate Genetic Conditional genetic variance
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