Molecular Evolution of Self Incompatibility in Plants

生物体可以对新的疾病产生抵抗力，或者利用 新的食物来源，因为他们的遗传多样性， 作为进化的原材料， 过程 存在许多机制来增加或减少 大量的遗传多样性。 近亲繁殖，一种交配系统， 近亲交配产生后代，可以减少 在自然种群中的遗传变异， 基因在血统上相同的概率。 在植物中， 近亲繁殖会导致植物寿命缩短和作物产量降低 当相同的基因是致命基因时。 结果一些 植物已经进化出一种自交不亲和机制， 防止自花受精， 近亲繁殖 在许多植物中， 是由一个基因编码的 自交不亲和基因可以 不仅增加了基因座的遗传变异 但也可能增加附近基因的多样性。 的 本研究的主要目的是研究 茄属植物自交不亲和基因座的核苷酸序列 carolinense，马荨麻，为了确定影响 自交不亲和机制对这种独特的 基因位点和附近的核苷酸位点上。

Organisms can become resistant to new diseases or utilize a new food source as a result of diversity in their genetic material which serves as raw material for the evolutionary process. Many mechanisms exist to increase or decrease the amounts of genetic diversity. Inbreeding, a mating system where closely related individuals mate to produce offspring, can reduce genetic variation in natural populations by increasing the probability that genes are identical by descent. In plants, inbreeding can lead to short-lived plants and reduced crop yields when the identical genes are lethal genes. As a result, some plants have evolved a self-incompatibility mechanism that prevents self-fertilization and the harmful effects of inbreeding. In many species of plants, the self-incompatibility function is encoded by a single gene. The self-incompatibility gene can not only increase genetic variation at the locus that encodes it but may also increase diversity of genes located nearby. The main objective of this research is to study variation of nucleotide sequences of the self-incompatibility locus of Solanum carolinense, the horse nettle, in order to determine the impact that the self-incompatibility mechanism has on this unique genetic locus and on nearby nucleotide sites.