Nonviable seed set enhances plant fitness: the sacrificial sibling hypothesis
Nonviable seed set enhances plant fitness: the sacrificial sibling hypothesis
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DOI：
10.1890/07-1436.1
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发表时间：
2009-02-01
期刊：
影响因子：
4.8
通讯作者：
Satake, Akiko
中科院分区：
文献类型：
--
作者：
Ghazoul, Jaboury;Satake, Akiko
许多树种产生的果实远远超过最终成熟的果实，其中很大一部分正在发育的果实在发育过程中被流产。这是否是一个母系控制的晚作用自交不亲和机制，或近交衰退的表达，是很难确定的。然而，在任何一种情况下，选择都倾向于使近交或不亲和的合子早期败育，以尽量减少资源的损失。在许多物种中，这并没有发生，这表明保留自交或近交种子在相对较晚的发育阶段流产的适应性原因的可能性。我们建议，这样的种子作为种子捕食者汇，从而增加了生存概率的异交和完全可行的种子稀释前扩散的种子捕食者的影响发挥着重要的作用。我们认为，通过种子捕食者攻击期间保留和发展的自交种子有效地提供和牺牲的异交种子的利益。
Many tree species produce far more fruits than eventually mature, with a large proportion of developing fruits being aborted midway through the development process. Whether this is a maternally controlled late-acting self-incompatibility mechanism, or an expression of inbreeding depression, is difficult to determine. In either case, however, selection is expected to favor early abortion of inbred or incompatible zygotes to minimize loss of resources. In many species, this does not occur, suggesting the possibility of adaptive reasons for retaining selfed or inbred seeds that are aborted at relatively late developmental stages. We propose that such seeds serve an important function in diluting the impact of pre-dispersal seed predators by acting as seed predator sinks and thereby increasing the survival probabilities of outcrossed and fully viable seeds. We suggest that selfed seeds retained and developed through the periods of seed predator attack are effectively offered and sacrificed for the benefit of outcrossed seeds.