Genetic modifications of dimorphic incompatibility in the Turnera ulmifolia L. complex (Turneraceae)

J. Shore, S. Barrett
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引用次数: 22

Abstract

Diploid and tetraploid populations of Turnera ulmifolia are distylous and exhibit a strong self-incompatibility system. Distyly is governed by a single locus with two alleles. Several self-compatible variants were, however, obtained and the nature and genetic control of self-compatibility was assessed using controlled crosses. The study documented the occurrence of self-compatible variants in four contrasting situations. These included the following. (i) Self-compatibility in a diploid short-styled variant. The gene(s) governing self-compatibility interact with the distyly locus and are expressed only in short-styled plants. When tetraploids carrying the genes were synthesized, self-incompatibility reappeared. (ii) Self-compatibility occurred in a cross between geographically separate diploid populations. Self-compatibility appeared sporadically in the F1. Crosses revealed that self-compatibility is likely under polygenic control. (iii) Low levels of self-compatibility occurred in a tetraploid population....
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芜菁复合体二形不亲和性的遗传修饰
杜鹃的二倍体和四倍体群体是二花的,表现出很强的自交不亲和系统。disyly由一个带有两个等位基因的位点控制。然而,获得了几个自亲和变异,并利用控制杂交评估了自亲和的性质和遗传控制。该研究记录了自相容变异在四种不同情况下的发生。其中包括以下内容。(i)二倍体短花柱变异的自亲和性。控制自亲和性的基因只在短柱植物中表达。当携带基因的四倍体合成时,再次出现自交不亲和。(ii)自亲和发生在地理上分离的二倍体群体间的杂交中。在F1中偶有自亲和。杂交表明,自亲和性可能受多基因控制。(iii)低水平的自交亲和发生在四倍体群体....
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