The evolution of self‐fertilization and inbreeding depression under pollen discounting and pollen limitation
The evolution of self‐fertilization and inbreeding depression under pollen discounting and pollen limitation
复制标题
DOI：
10.1111/j.1420-9101.2005.00905.x
复制
发表时间：
2005-05
影响因子：
2.1
通讯作者：
Emmanuelle Porcher;R. Lande
中科院分区：
文献类型：
--
作者：
Emmanuelle Porcher;R. Lande
我们模拟的花粉折扣和花粉限制的联合作用下，植物交配系统的进化，使用一个动态模型的近交衰退，允许通过自交部分清除隐性致死突变。稳定的混合交配系统发生在一个广泛的参数值与花粉折扣单独。然而，当典型的花粉限制水平与花粉折扣相结合时，稳定的自交率总是很高，但小于1（在大多数情况下，0.9 < s < 1）;在这种情况下，完全自交不会进化，因为花粉折扣在高自交率下变得非常大，因此自交的自动优势变为劣势。这些结果表明，具有高自交率的混合交配系统可以通过选择来维持，而具有低至中等自交率的混合交配系统更可能归因于不可避免的geitonogamous自交。
We model the evolution of plant mating systems under the joint effects of pollen discounting and pollen limitation, using a dynamic model of inbreeding depression, allowing for partial purging of recessive lethal mutations by selfing. Stable mixed mating systems occur for a wide range of parameter values with pollen discounting alone. However, when typical levels of pollen limitation are combined with pollen discounting, stable selfing rates are always high but less than 1 (0.9 < s < 1 in most cases); in this situation, complete selfing does not evolve because pollen discounting becomes very large at high selfing rates, so that the automatic advantage of selfing changes to a disadvantage. These results suggest that mixed mating systems with high selfing rates can be maintained by selection, whereas mixed mating systems with low to moderate selfing rates are more likely attributable to unavoidable geitonogamous selfing.