HYBRIDIZATION, GENOMIC CONSTITUTION AND GENERIC DELIMITATION IN ELYMUS SL (POACEAE, TRITICEAE)
HYBRIDIZATION, GENOMIC CONSTITUTION AND GENERIC DELIMITATION IN ELYMUS SL (POACEAE, TRITICEAE)
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DOI：
10.1007/bf00982855
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发表时间：
1995-01-01
影响因子：
1.9
通讯作者：
RUNEMARK, H
中科院分区：
文献类型：
--
作者：
ASSADI, M;RUNEMARK, H
属间杂交是在基因组定义的披碱草属、冰草属、披碱草属、假鹅观草属和细穗披碱草属的代表之间进行的。披碱草属模式种披碱草的基因组组成为SSH，这是一种只有披碱草属中才有的基因组组合。拟鹅观草属的S基因组几乎总是对其所属分类群的形态产生显性影响。Wang(1989)指出，偃麦草的J基因组与S的基因组有相当大的同源性，在二倍体SJ杂交种中的平均c值为0.35。从S到SJ(E)、J(B)和J(B)的遗传一致性是可以预期的，与观察到的连续形态变异模式一致。由于在分类群之间没有形态不连续，Pseudoroegneria(S)，Elymus(SH，SY，有时具额外的基因组)，Elytrigia(SSH，SSHX)和Thinopyrum(SJ，SJJ，J)是最好的处理作为一个属，披碱草，遵循在欧洲植物志和土耳其的植物群中的Melderis的属的概念。披碱草的基本基因组成分将是S和/或J基因组。冰草是以P基因组为基础的二倍体、四倍体和六倍体，在形态上与小麦科其他属不同。在披碱草属和假鹅观草属的少数物种中，P基因组是一个额外的组成部分。在这些情况下，P基因组的形态影响可以忽略不计。因此，将冰草作为一个单独的属似乎是合理的。
Intergeneric crosses were made between representatives of the genomically-defined genera Elymus, Agropyron, Elytrigia, Pseudoroegneria, and Thinopyrum. The genomic constitution of Elytrigia repens, the type species of Elytrigia, is shown to be SSH, a genomic combination otherwise found only in Elymus. The S genome of Pseudoroegneria has almost always a dominant influence on the morphology of the taxa of which it is a component. Wang (1989) showed that the J genome in Thinopyrum and the S genome have considerable homoeology, with a mean c-value of 0.35 in diploid SJ hybrids. A genetic coherence from S to SJ(e), J(e), J(e),J(b), and J(b) can be expected, agreeing with the continuous morphologic variation pattern observed. Because of the absence of morphological discontinuities between the taxa, Pseudoroegneria (S), Elymus (SH, SY, sometimes with additional genomes), Elytrigia (SSH, SSHX), and Thinopyrum (SJ, SJJ, J) are best treated as a single genus, Elymus, following the generic concept of Melderis in Flora Europaea and Flora of Turkey. The basic genomic constituents of Elymus will then be the S and/or J genomes. Agropyron, with diploids, tetraploids, and hexaploids based on the P genome is morphologically distinct from other genera in Triticeae. In a few species of Elymus and Pseudoroegneria, a P genome is an additional constituent. In these cases the P genome has a negligible morphological influence. Therefore, it seems reasonable to maintain Agropyron as a separate genus.