INTERSPECIFIC POLLEN TRANSFER AS A MECHANISM OF COMPETITION - CONSEQUENCES OF FOREIGN POLLEN CONTAMINATION FOR SEED SET IN THE ALPINE WILDFLOWER, POLEMONIUM-VISCOSUM
INTERSPECIFIC POLLEN TRANSFER AS A MECHANISM OF COMPETITION - CONSEQUENCES OF FOREIGN POLLEN CONTAMINATION FOR SEED SET IN THE ALPINE WILDFLOWER, POLEMONIUM-VISCOSUM
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DOI：
10.1007/bf00377020
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发表时间：
1989-01-01
期刊：
影响因子：
2.7
通讯作者：
GREGORY, T
中科院分区：
文献类型：
--
作者：
GALEN, C;GREGORY, T
早期的研究表明，在自然条件下，粘性青霉种群接受外来花粉与失去结实有关。在这里，我们报告了使用来自两个同花物种的外来花粉进行授粉的实验，这两个物种与粘性拟南芥共享传粉者。实验的目的是确定在受控条件下，不适当的花粉转移是否会导致结实率下降，如果是，则确定干扰发生的阶段。在用Mertensia或Castilleja花粉进行授粉前处理的花中，随后沉积的同种花粉粒的粘附性不受影响。然而，在接受异源花粉的花朵中，同种籽粒的萌发和胚珠受精成功率显著低于对照。这些结果表明，高山植物群落中传粉者的不忠可能通过抑制同种花粉粒的表现而降低粘性杨树的雌性生殖成功率。尽管种间花粉粒形态存在较大差异，但Mertensia和Castilleja花粉的负效应是相似的。因此，对外来花粉干扰的敏感性似乎是粘性假单胞菌的一种固有特性，而不依赖于竞争种产生的花粉的独特结构特性。
Earliear studies showed that under natural conditions foreign pollen receipt is correlated with loss of seed set in populations of P. viscosum. Here, we report on experimental pollinations using foreign pollen from two co-flowering species that share pollinators with P. viscosum. Experiments were designed to ascertain whether improper pollen transfer causes reduced seed set under controlled conditions and, if so, to determine the stage at which interference occurs. In flowers pre-treated by pollination with either Mertensia or Castilleja pollen, adherence of subsequently deposited conspecific pollen grains was unaffected. However, conspecific grains had significantly lower germination and ovule fertization success in flowers receiving foreign pollen than in controls. These results suggest that pollinator infidelity in high alpine plant communities can reduce female reproductive success of P. viscosum by inhibiting the performance of conspecific pollen grains. Negative effects of Mertensia and Castilleja pollen were comparable despite large interspecific differences in pollen grain morphology. Accordingly, susceptibility to foreign pollen interference appears to be an intrinsic property of P. viscosum that is not dependent on the unique structural properties of pollen produced by competitive species.