Individual variation, gametophytic competition and style length: does size affect paternity?
Individual variation, gametophytic competition and style length: does size affect paternity?
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个体变异、配子体竞争和花柱长度：大小会影响亲子关系吗？
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
K. Shea
中科院分区：
文献类型：
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作者：
S. Travers;K. Shea
授粉后，花粉粒之间为胚珠受精而进行的竞争可能会将劣势雄配子体从生殖过程中过滤掉。据推测，在相对较长的花柱中，遗传多样性花粉粒之间的竞争将比相对较短的花柱更激烈。然而，很少有实证研究探讨了花柱长度的影响，花粉供体之间的差异，在siring成功。我们开发了一个模型的花粉管生长的一年生草本植物（Clarkia unguiculata）在体内的花粉性能和花柱长度的措施的基础上，研究花柱长度和两个竞争的捐助者与不同的花粉性能参数的种子繁殖的百分比之间的关系。我们发现，在一系列条件下，当花柱长度增加时，上级供体的繁殖成功率没有增加。此外，只有在短于野生居群的花柱中，花柱长度与花柱过滤能力呈正相关。unguiculata，这表明在花柱长度的变化有过滤能力在本种的自然群体的影响不大。我们的结论是，男性和女性的生殖成功可以影响花柱长度，但在一组有限的条件下。
Post-pollination competition among pollen grains for the fertilization of ovules can potentially filter out inferior male gametophytes from the reproductive process. It has been assumed that, in relatively long styles, competition among genetically diverse pollen grains will be more intense than in relatively short styles. However, very few empirical studies have examined the influence of style length on differences among pollen donors in siring success. We developed a model of pollen tube growth based on measures of in vivo pollen performance and style length of an annual herb (Clarkia unguiculata) to examine the relationship between style length and the percentage of seeds sired by two competing donors with differing pollen performance parameters. We found that there is no increase in the siring success of a superior donor as style length increases under a range of conditions. Moreover, there was a positive relationship between style length and style filtering ability only in styles shorter than those found in wild populations of C. unguiculata, suggesting that variation in style length has little influence on filtering ability in natural populations of this species. We conclude that both male and female reproductive success can be influenced by style length, but under a restricted set of conditions.