Phenotypic plasticity in Potamogeton (Potamogetonaceae)
Phenotypic plasticity in Potamogeton (Potamogetonaceae)
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DOI：
10.1007/bf02804229
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发表时间：
2002-01-01
影响因子：
1.2
通讯作者：
Kaplan, Z
中科院分区：
文献类型：
--
作者：
Kaplan, Z
本文从形态学特征的稳定性角度，探讨了眼子菜属植物种和杂种广泛形态变异的来源。通过移栽试验、不同环境因子值下的无性系培养试验和统一条件下的不同无性系培养试验，分析了表型可塑性在总形态变异中所占的比例。从184个种群的41个眼子菜类群的样品生长，表型可塑性的巨大范围，这是可能的一个单一的克隆，详细记录在14个良好描述的例子。当在相同的环境条件下一起生长时，在田间观察到的单个物种的不同种群之间的差异大多不会保持。在不同环境因子值下培养的克隆材料产生不同的表型，在少数情况下，单个基因型能够在该物种已知的观察性状中表现出几乎整个形态变异范围，最近文献中声称的几个适于区分品种甚至物种的性状被证明依赖于环境条件，并且是高度不可靠的标记，分类群的划分。最近文献中的三个例子说明了不令人满意的分类结果时，这种分类的表型是通过。表型可塑性是眼子菜属植物种内形态变异的主要来源，其影响远大于基因型差异引起的形态差异。
Sources of the extensive morphological variation of the species and hybrids of Potamogeton were studied, especially from the viewpoint of the stability of the morphological characters used in Potamogeton taxonomy. Transplant experiments, the cultivation of clones under different values of environmental factors, and the cultivation of different clones under uniform conditions were performed to assess the proportion of phenotypic plasticity in the total morphological variation. Samples from 184 populations of 41 Potamogeton taxa were grown, The immense range of phenotypic plasticity, which is possible for a single clone, is documented in detail in 14 well-described examples. The differences among distinct populations of a single species observed in the field were mostly not maintained when grown together under the same environmental conditions. Clonal material cultivated under different values of environmental factors produced distinct phenotypes, and in a few cases a single genotype was able to demonstrate almost the entire range of morphological variation in an observed trait known for that species, Several characters by recent literature claimed to be suitable for distinguishing varieties or even species were proven to be dependent on environmental conditions and to be highly unreliable markers for the delimitation of taxa. The unsatisfactory taxonomy that results when such classification of phenotypes is adopted is illustrated by three examples from recent literature. Phenotypic plasticity was found to be the main source of morphological variation within the species of Potamogeton, having much more influence than morphological differences caused by different genotypes.