Effects of Pollen-load Size on Sporophyte Competitive Ability in Two Epilobium Species
Effects of Pollen-load Size on Sporophyte Competitive Ability in Two Epilobium Species
复制标题
花粉量大小对两种柳兰孢子体竞争能力的影响
DOI：
10.2307/2426239
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发表时间：
1991
影响因子：
0.6
通讯作者：
A. Snow
中科院分区：
文献类型：
--
作者：
A. Snow
花粉管之间对胚珠的竞争可导致孢子体活力的增加。这种现象已经在一些栽培物种中得到了很好的研究，但对于它是否发生在自然种群中却知之甚少。研究了花粉管竞争对七叶莲子代性能的影响。canum。利用三株父本植物的花粉混合物，每个物种的三株母本植物接受了少量或过量的花粉负荷。这些处理的后代与野生燕麦竞争生长，并在温室中9周后收获。在6个母系家族中，只有一个家族的花粉竞争激烈，导致后代显著增大。在另一个母系中，过量花粉负荷的后代实际上比少量花粉负荷的后代要小。授粉处理对种子大小的影响不一致，对植株大小没有影响。这项研究不支持花粉竞争促进选择更快生长后代的假设。
-Competition among pollen-tubes for ovules can lead to increased sporophytic vigor. This phenomenon has been well studied in a few cultivated species, but little is known about whether it occurs in natural populations. I tested for effects of pollen-tube competition on progeny performance in Epilobium septentrionale and E. canum ssp. canum. Three maternal plants of each species received small vs. excessive pollen-loads, using mixtures of pollen from three paternal plants. Progeny from these treatments were grown in competition with wild oats and harvested after nine weeks in the greenhouse. Intense pollen competition led to significantly larger progeny in only one of the six maternal families. In another maternal family, offspring from excessive pollen-loads were actually smaller than those from small pollen-loads. Pollination treatment had inconsistent effects on seed size, which did not appear to influence plant size. This study does not support the hypothesis that pollen competition fosters selection for faster-growing progeny.