玉米B染色体优先受精变异:B染色体驱动机制的一个组成部分

Vincent A. Brennan, Hua Yang, Zhi Gao, James A. Birchler
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引用次数: 2

摘要

摘要玉米B染色体是一条多余染色体,由于其可有可无性,只存在于部分玉米品系中。在其进化过程中,B染色体发展了一个由两部分组成的驱动机制,以确保其在玉米群体中继续存在。它的驱动机制涉及在第二次花粉有丝分裂中产生两个精子细胞的不分离和精子优先受精,在双受精过程中,两条B染色体更多地与卵子结合,而不是与中心细胞结合。先前的研究表明,一些玉米品系表现出不同的反应,这是由母本控制的。我们试图通过测试广泛的特征玉米品系来检查这一性状的变异。大多数自交系表现出对卵细胞的典型偏好,有些似乎是随机受精,而一个自交系(B73)表现出对含有精子的B细胞的偏好,以使中心细胞受精。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Variation for maize B chromosome preferential fertilization: a component of the B chromosome drive mechanism
Abstract The B chromosome in maize is a supernumerary chromosome that due to its dispensability is present in only some lines of maize. Over its evolution, the B chromosome has developed a two-part drive mechanism that ensures its continued presence in maize populations. Its drive mechanism involves nondisjunction at the second pollen mitosis in which two sperm cells are produced and preferential fertilization by the sperm with the two B chromosomes more often joining with the egg as opposed to the central cell in the process of double fertilization. Previous work had suggested some lines of maize exhibit a different response and that this was controlled by the female parent. We sought to examine the variation for this trait by testing a wide spectrum of characterized maize lines. Most inbred lines exhibit the canonical preference for the egg cell, some appear to have random fertilization, and one inbred line (B73) shows a preference for the B containing sperm to fertilize the central cell.
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