Autogamy and floral longevity in Mimulus guttatus
Autogamy and floral longevity in Mimulus guttatus
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DOI：
10.1086/340444
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发表时间：
2002-07-01
影响因子：
2.3
通讯作者：
Kelly, JK
中科院分区：
文献类型：
--
作者：
Arathi, HS;Rasch, A;Kelly, JK
花的寿命是假菊繁殖成功的重要决定因素。在控制条件下，对铁山稻居群的花寿命进行了研究。在没有传粉者的情况下，花通常持续4-6天。然而，这一特性表现出相当大的可塑性。花粉成功地沉积在柱头上，而不是从花中取出花粉，从而导致寿命缩短。减少水分供应也减少了花的寿命。实验表明，在一朵花的整个生命周期中，雄性和雌性的生殖能力都在不断下降。这可能表明花在花冠脱落的时候已经获得了最大的益处。我们还进行了操纵实验，以确定在一朵花的一生中何时发生自交配。虽然一些自交配发生在花期后的前几天，但大多数发生在花的生命周期后期。考虑到这些结果与先前的研究的关系，我们认为，在M. guttatus花的自交配的数量和时间可能是由一个群体中传粉者的活动水平决定的。
Floral longevity is an important determinant of reproductive success in Mimulus guttatus. We conducted a series of experiments investigating floral longevity in the Iron Mountain population of M. guttatus under controlled conditions. In the absence of pollinators, flowers typically last 4-6 d. However, this trait exhibits considerable plasticity. Reduced longevity is triggered by the successful deposition of pollen on the stigma but not by removal of pollen from the flower. Reducing water availability also reduced the duration of the floral life span. Experimental manipulations reveal that both male and female reproductive capacity declines continuously throughout the life span of a flower. This may indicate that flowers have obtained the maximum benefit possible by the time the corolla is abscised. We also performed manipulative experiments to determine when autogamy occurs in the lifetime of a flower. Although some autogamy occurs in the first couple of days postanthesis, most of it occurs late in the floral life span. Considering these results in relation to previous studies, we argue that the amount and timing of autogamy in M. guttatus flowers is likely to be determined by the level of pollinator activity in a population.