The Role of Pollen Extensin Chimeras in Pollen-Pistil Interactions

[00:96 . 76]在高等植物中，雄花粉中的精子通过生长中的花粉管传递给雌蕊中的卵子。为了使受精发生，相容物种之间必须有非常特定的花粉-雌蕊识别。这项工作的重点是花粉管中被称为Pex蛋白的蛋白质。Pex蛋白的结构和位置表明它们是识别分子。一系列的基因和分子生物学实验将检验这是否属实。这些研究将在两个方面对改良作物品种的发展产生影响。首先，我们必须了解植物繁殖障碍的本质，因为我们有理由担心转基因作物与邻近植物物种的异花授粉。其次，未来的实验将集中在操纵Pex蛋白，以选择性地绕过植物物种之间的生殖障碍，从而引入理想的性状，例如从野生物种到驯化物种。

0091976BedingerIn higher plants, the sperm in the male pollen are delivered to the egg in the female pistil via a growing pollen tube. For fertilization to occur, there must be very specific pollen-pistil recognition between compatible species. The work focuses on proteins in the pollen tube called Pex proteins. The structure and location of the Pex proteins suggest that they are recognition molecules. A series of genetic and molecular biology experiments will test whether or not this is the case. These studies will have an impact on the development of improved crop species in two ways. First, it is imperative that we understand the nature of reproductive barriers in plants because of valid concerns about cross pollination of genetically engineered crop plants with neighboring plant species. Second, future experiments will focus on manipulating Pex proteins to selectively circumvent reproductive barriers between plant species in order to introduce desirable traits, for example from wild species into domesticated species.