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首页> 外文期刊>International journal of plant sciences >EXPLAINING OUTCROSSING RATE IN CAMPANULASTRUM AMERICANUM (CAMPANULACEAE): GEITONOGAMY AND CRYPTIC SELF-INCOMPATIBILITY
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EXPLAINING OUTCROSSING RATE IN CAMPANULASTRUM AMERICANUM (CAMPANULACEAE): GEITONOGAMY AND CRYPTIC SELF-INCOMPATIBILITY

机译：解释美国金刚藻（CAMPANULACEAE）的异交率：基因组遗传学和隐匿性自交不亲和性

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摘要

A flexible mating system may enable self-compatible plants to prevent self-fertilization under certain circumstances. Campanulastrum americanum is a self-compatible, protandrous herb. Although within-plant pollen transfer is likely and self pollen can produce a full set of seeds, selfing in natural populations is rare. We investigated explanations for the high outcrossing rate. One possibility was that self pollen contacts the stigma rarely. We surveyed floral displays in nature to gauge the potential for within-plant pollen transfer. Floral displays in nature are large enough to enable frequent geitonogamous pollinator visits and subsequent self-pollination. Alternatively, the high outcrossing rate could result from cryptic self-incompatibility, a mechanism that favors outcross pollen over self pollen. To determine whether outcross pollen has a seed-siring advantage over self pollen, we pollinated maternal plants with equal mixtures of self and outcross pollen. Genotyping the offspring revealed that outcross pollen sired significantly more seeds than self pollen. We explored whether differential growth rates of self and outcross pollen tubes produce cryptic self-incompatibility. Growth rates did not differ, indicating that cryptic self-incompatibility occurs by some other mechanism. Cryptic self-incompatibility enables C. americanum to reduce inbreeding when outcross pollen is present yet ensure reproduction when only self pollen is available.
机译：灵活的交配系统可以使自交植物在某些情况下能够防止自体受精。美国桔梗（Campanulastrum americanum）是一种自溶性，原状的草药。尽管植物内的花粉可能会转移并且自花粉可以产生完整的种子，但自然种群中的自交却很少。我们调查了高异形率的解释。一种可能性是自花粉很少接触柱头。我们调查了自然界中的花卉展示，以评估植物内部花粉转移的潜力。自然界中的花卉展示足够大，可以进行频繁的传粉虱传粉者探访和随后的自花授粉。或者，高异种率可能是由于隐秘的自交不亲和性导致的，这种不亲和性是自异花粉偏爱异种花粉的一种机制。为了确定异花粉是否比自花粉具有种籽优势，我们用相同的自花粉和异花粉混合物为母本植物授粉。对后代进行基因分型显示，异花粉的种子比自花粉的种子多得多。我们探讨了自花粉管和异花粉管的不同增长率是否会产生隐秘的自我不相容性。增长率没有差异，表明通过其他某种机制发生了隐秘的自我不兼容性。隐性自交不亲和力使美洲念珠菌在存在异花粉时能够减少近交，但在只有自花粉时才能确保繁殖。

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