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首页> 外文学位 >Sex allocation and reproductive success in an andromonoecious perennial plant, Solanum carolinense L. (Solanaceae).
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Sex allocation and reproductive success in an andromonoecious perennial plant, Solanum carolinense L. (Solanaceae).

机译：多年生雄雄同株的茄科植物茄科的性别分配和繁殖成功。

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摘要

Sex allocation theory, as a reinterpretation of Bateman's principle, predicts that male success is limited by access to mates (pollinator attraction), while female success is limited by resources (fruit and seed production). This research was designed to address these predictions within an evolutionary context. First, to determine whether floral characters and the breeding system could respond to selection in Solanum carolinense, I performed a quantitative genetics experiment to determine the heritability of and genetic correlations between floral traits. Then, to determine whether floral characters affect sex-specific reproductive success, I designed a field experiment that elucidated the relationship between floral characters and realized male and female success under natural pollination conditions.; The sizes of flower parts are heritable in this species, and so flower size can respond to selection; however, positive genetic correlations among the sizes of floral parts indicate that flower shape is not likely to change. Flower number is also heritable, as is the proportion of male flowers produced by a plant. In the field experiment, flower size was shown to have a positive influence on reproductive success gained through female function, but a negative effect on reproductive success gained through male function. Flower number had a positive effect on both sex fUnctions, but higher proportions of male flowers, while increasing male success, caused a decline in female success within individuals. Differences in phenotype among individuals therefore lead to variation in their sex-specific success, which affects their functional gender.; In toto, these experiments indicate that sex allocation can affect sex-specific reproductive success in Solanum carolinense, and that there is the potential for the evolution of gender specialization in this species, which may lead to future changes in the breeding system. In addition, these results do not agree with some aspects of sex allocation theory, since the production of large, attractive structures may be more important to female than male fitness in this species.
机译：性别分配理论作为对贝特曼原理的重新解释，预测男性的成功受限于与伴侣的接触（传粉媒介的吸引），而女性的成功受限于资源（水果和种子的生产）。本研究旨在在进化背景下解决这些预测问题。首先，为了确定花卉性状和育种系统是否可以对茄果茄的选择作出反应，我进行了定量遗传学实验，以确定花卉性状的遗传力和遗传相关性。然后，为了确定花卉特征是否影响特定性别的生殖成功，我设计了一个田间实验，阐明了花卉特征与自然授粉条件下男性和女性成功之间的关系。该物种的花部分的大小是可遗传的，因此花的大小可以响应选择。然而，花的大小之间的正相关性表明花的形状不太可能改变。花的数目也是可遗传的，植物产生的雄花的比例也是可遗传的。在田间试验中，花的大小对通过女性功能获得的生殖成功有正面影响，但对通过男性功能获得的生殖成功有负面影响。花的数量对两性功能都有积极影响，但是较高比例的雄花，虽然增加了雄性的成功率，却导致女性内部雌性的成功率下降。因此，个体之间的表型差异会导致其特定性别的成功发生变化，从而影响其功能性别。总体而言，这些实验表明性别分配会影响茄茄的性别特定生殖成功，并且该物种的性别专业化有发展的潜力，这可能会导致繁殖系统的未来变化。此外，这些结果与性别分配理论的某些方面不一致，因为在该物种中，对女性而言，大型，有吸引力的结构的产生可能比雄性更重要。

著录项

  • 作者

    Elle, Elizabeth.;

  • 作者单位

    Rutgers The State University of New Jersey - New Brunswick.;

  • 授予单位 Rutgers The State University of New Jersey - New Brunswick.;
  • 学科 Biology Ecology.; Biology Genetics.; Biology Botany.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 112 p.
  • 总页数 112
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生态学（生物生态学）;遗传学;植物学;
  • 关键词

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