Inbreeding depression in dioecious populations of the plant Mercurialis annua: comparisons between outcrossed progeny and the progeny of self-fertilized feminized males
Inbreeding depression in dioecious populations of the plant Mercurialis annua: comparisons between outcrossed progeny and the progeny of self-fertilized feminized males
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DOI：
10.1038/hdy.2009.21
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发表时间：
2009-06-01
期刊：
影响因子：
3.8
通讯作者：
Pannell, J. R.
中科院分区：
文献类型：
--
作者：
Eppley, S. M.;Pannell, J. R.
近交抑制是植物通过选择避免自交受精来维持雌雄分离的关键因素。然而，我们对雌雄异株物种的近交抑制程度知之甚少，这显然是因为雄性或雌性很难自我受精。我们通过在欧洲一年生植物水仙（Mercurialis annua）的雌雄异株元群体中无性繁殖来自世系的雄性，将其中一些雌性化，并将雌性化的无性系与非雌性化的无性系杂交，克服了这个问题。利用这种方法，我们比较了该物种在西班牙自然生长的田间条件下自交和异交后代的适合度。繁殖性近交抑制（基于种子萌发、早期和晚期存活率、种子质量和花粉活力）范围为-0.69 ~ 0.82，平均值接近于零。我们考虑了黄花楸近交抑制的低均值和高方差的可能解释，并讨论了我们的结果对维持雌雄异株而不是雌雄同体的影响。遗传（2009）102,600-608；doi: 10.1038 / hdy.2009.21;2009年3月18日在线发布
Inbreeding depression is a key factor in the maintenance of separate sexes in plants through selection for the avoidance of self-fertilization. However, very little is known about the levels of inbreeding depression in dioecious species, obviously because it is difficult to self-fertilize males or females. We overcame this problem by clonally propagating males from lineages in a dioecious metapopulation of the European annual plant Mercurialis annua, feminizing some of them and crossing the feminized with the unfeminized clones. Using this method, we compared the fitness of selfed vs outcrossed progeny under field conditions in Spain, where this species grows naturally. Multiplicative inbreeding depression (based on seed germination, early and late survival, seed mass and pollen viability) ranged from -0.69 to 0.82, with a mean close to zero. We consider possible explanations for both the low mean and high variance in inbreeding depression in M. annua, and we discuss the implications of our results for the maintenance of dioecy over hermaphroditism. Heredity (2009) 102, 600-608; doi:10.1038/hdy.2009.21; published online 18 March 2009