THE QUANTITATIVE GENETICS OF SEXUAL DIMORPHISM IN SILENE LATIFOLIA (CARYOPHYLLACEAE). I. GENETIC VARIATION
THE QUANTITATIVE GENETICS OF SEXUAL DIMORPHISM IN SILENE LATIFOLIA (CARYOPHYLLACEAE). I. GENETIC VARIATION
复制标题
石竹科植物性二态性的数量遗传学。
DOI：
--
复制
发表时间：
1992
期刊：
影响因子：
--
通讯作者：
T. Meagher
中科院分区：
文献类型：
--
作者：
T. Meagher
人们普遍认识到，在植物对父本和母本功能的资源需求之间存在着基本的冲突。在雌雄异株的物种中，这些不同的需求，以及它们施加的选择压力，可能导致性二型的进化。本研究通过对宽叶蝇子草一系列生长和生殖性状的遗传变异和性状间及性别间的遗传相关性进行分析，探讨宽叶蝇子草性二型性进化的可能性。性二型性在很大程度上限于生殖性状，特别是花的数量和花的大小。典型相关分析显示相当大的生长性状，如发芽日期，高度，和叶片大小，和繁殖性状之间的相关性;植物生长快早也开花早，植物产生大叶也产生大花。有几个性二形性状的遗传变异，在此分析的重点是花的大小，特别是花萼直径。最后，研究人员发现，两性内部和两性之间的遗传相关性限制了两性之间进化分歧的速度。遗传学结果表明，S.阔叶树在很长一段时间内受到两性的不同选择，导致性别限制的基因效应逐渐固定，因此剩余的遗传效应在两性中都表达。由这种残余变异产生的两性之间的遗传相关性限制了进一步的进化变化。
It is widely recognized that there are basic conflicts between the resource needs of a plant for paternal versus maternal functions. In dioecious species, these divergent demands, and the selection pressures they impose, can lead to the evolution of sexual dimorphism. The present study was conducted to assess the potential for the evolution of sexual dimorphism in Silene latifolia by evaluating the genetic variation and genetic correlation between characters and between the sexes for a range of growth and reproductive characters. Sexual dimorphism is largely restricted to reproductive characters, particularly flower number and flower size. A canonical correlation analysis revealed considerable intercorrelation between growth characters, such as germination date, height, and leaf size, and reproductive characters; plants that grow fast early on also flower earlier, and plants that produce big leaves also produce big flowers. There was genetic variation for several sexually dimorphic characters; much of the focus in this analysis was on flower size, particularly calyx diameter. Finally, genetic correlations within and between the sexes were found that limit the rate of evolutionary divergence between the sexes. The genetic results suggest that S. latifolia has been subject to divergent selection on the two sexes for a long period of time, bringing about a gradual fixation of sex‐limited gene effects, so that the remaining genetic effects are expressed in both sexes. Genetic correlations between the sexes that arise from this residual variation impose limits on further evolutionary change.