Whole genome duplication does not promote common modes of reproductive isolation in Trifolium pratense
Whole genome duplication does not promote common modes of reproductive isolation in Trifolium pratense
复制标题
全基因组复制不会促进红车轴草常见的生殖隔离模式
DOI：
10.1002/ajb2.1466
复制
发表时间：
2020
影响因子：
3
通讯作者：
Segraves, Kari A.
中科院分区：
文献类型：
--
作者：
Porturas, Laura D.;Segraves, Kari A.
虽然多倍体早在20世纪初就已经被研究，但多倍体生态学和进化的基本方面仍然没有被探索。特别是，令人惊讶的是，人们对新形成的多倍体（新多倍体）如何在人口统计学上建立起来知之甚少。模型预测，大多数多倍体应该在最初的几代内灭绝，这是由于在主要的二倍体种群中作为少数群体而导致的生殖劣势（即，少数细胞型原则），但多倍体是非常常见的。因此，多倍体研究的一个关键目标是确定自然界中促进多倍体建立的机制。由于交配前隔离是至关重要的，以neopolylpoids，以避免少数细胞型排斥，从而促进建立，我们研究了花的形态和三个常见的交配前障碍，以确定其重要性，在产生的neopolylpoids从diploids.MethodsWe生殖隔离诱导neopolylploidy在红三叶pratense和比较其花性状的二倍体祖先。除了在花形态的变化，我们研究了三个交配前的障碍：隔离自受精，开花时间短，授粉介导的isolation.ResultsWe发现显着差异的二倍体和新多倍体花的形态，但这些变化并没有促进交配前的障碍，将产生从二倍体的新多倍体生殖隔离。开花物候，传粉者的访问，或自交之间的cytotypes.ConclusionsOur结果表明，障碍以外的测试在这项研究中，如地理隔离，营养繁殖，雌蕊柱头不兼容，可能是更重要的，在促进隔离和建立neopolyploidT。普拉滕斯。
PremiseAlthough polyploidy has been studied since the early 1900s, fundamental aspects of polyploid ecology and evolution remain unexplored. In particular, surprisingly little is known about how newly formed polyploids (neopolyploids) become demographically established. Models predict that most polyploids should go extinct within the first few generations as a result of reproductive disadvantages associated with being the minority in a primarily diploid population (i.e., the minority cytotype principle), yet polyploidy is extremely common. Therefore, a key goal in the study of polyploidy is to determine the mechanisms that promote polyploid establishment in nature. Because premating isolation is critical in order for neopolylpoids to avoid minority cytotype exclusion and thus facilitate establishment, we examined floral morphology and three common premating barriers to determine their importance in generating reproductive isolation of neopolyploids from diploids.MethodsWe induced neopolyploidy inTrifolium pratenseand compared their floral traits to the diploid progenitors. In addition to shifts in floral morphology, we examined three premating barriers: isolation by self‐fertilization, flowering‐time asynchrony, and pollinator‐mediated isolation.ResultsWe found significant differences in the morphology of diploid and neopolyploid flowers, but these changes did not facilitate premating barriers that would generate reproductive isolation of neopolyploids from diploids. There was no difference in flowering phenology, pollinator visitation, or selfing between the cytotypes.ConclusionsOur results indicate that barriers other than the ones tested in this study—such as geographic isolation, vegetative reproduction, and pistil–stigma incompatibilities—may be more important in facilitating isolation and establishment of neopolyploidT. pratense.