Evolutionary considerations of claims for physical dormancy-break by microbial action and abrasion by soil particles
Evolutionary considerations of claims for physical dormancy-break by microbial action and abrasion by soil particles
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DOI：
10.1017/s0960258500000453
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发表时间：
2000-12-01
影响因子：
2.1
通讯作者：
Baskin, CC
中科院分区：
文献类型：
--
作者：
Baskin, JM;Baskin, CC
生态学、种子和植物生物学各个领域的书籍和评论文章继续报道，种子(和果实)休眠的打破是通过土壤微生物的作用和/或土壤颗粒的磨损来实现的。然而，科学文献中几乎没有证据支持这些假设，事实上，由于两个相关的原因，这些假设没有很好的进化论意义。首先，几种类型的解剖学上专门的水分限制结构已经进化为具有物理休眠的分类群的种子或果皮的一部分。这些结构作为物理环境变化的信号探测器，导致种子(和果实)只在这些地点变得透水，在季节和栖息地，一些幼苗很有可能形成。其次，在幼苗不能存活的季节和生境中，由于微生物的作用或磨损，种子(和果实)的种皮可能会破裂，从而降低了所讨论的植物分类群的适合性(Lambda)。
Books and review articles in various areas of ecology and seed and plant biology continue to report that dormancy-break in seeds (and fruits) with water-impermeable coats (i.e. physical dormancy) occurs via soil-microbial action and/or abrasion by soil particles. However, there is little evidence in the scientific literature to support these assumptions, which, in fact, do not make good evolutionary sense for two related reasons. First, several types of anatomically specialized water-restriction structures have evolved as part of the seed or fruit coat of taxa with physical dormancy. These structures act as 'signal detectors' of physical-environmental changes that cause seeds (and fruits) to become water-permeable only at these sites, in seasons and habitats in which there is a good chance that some seedlings will become established. Second, seed (and fruit) coat breakdown by microbial action or by abrasion likely would occur in seasons and habitats in which seedlings could not survive, thus lowering the fitness (lambda) of the plant taxa in question.