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DISSERTATION RESEARCH: Investigating recombination and the origin of genetic variation in apomictic ferns

论文研究：研究无融合生殖蕨类植物的重组和遗传变异的起源

基本信息

批准号：
1110767
负责人：
Kathleen Pryer
金额：
$ 1.5万
依托单位：
Duke University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2011
资助国家：
美国
起止时间：
2011-05-01 至 2014-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1110767&HistoricalAwards=false
关键词：
DISSERTATION RESEARCH Investigating recombination origin

项目摘要

Asexual plant and animal lineages have long been considered evolutionary dead ends, incapable of generating significant genetic variability. Recent evidence, however, suggests that some asexual lineages may undergo subsexual processes that can lead to an increase in genetic variation, thereby improving evolutionary potential for adaptation in extreme environments. This dissertation research will examine whether recombination can be documented in an apomictic fern lineage. Apomictic ferns are capable of a unique type of sporogenesis (one not known to occur in flowering plants) where there is a possibility for homologous chromosomes to pair and recombine genetic information during meiosis. Using modern genomic approaches in combination with cytological studies, this study aims to identify whether such genetic variation exists in these ferns and the possible extent of this phenomenon in natural populations.The proposed research will enhance current understanding of apomixis in ferns, an early diverging lineage of vascular plants that shares certain asexual traits with both animals and angiosperms. An increased knowledge of the biology of apomixis across plants is relevant not only for evolutionary and ecological studies of genetic variability in ferns, but can have wide-ranging implications for agricultural and crop sciences.

无性繁殖的植物和动物谱系长期以来被认为是进化的死胡同，无法产生显著的遗传变异。然而，最近的证据表明，一些无性繁殖的谱系可能会经历亚性过程，这可能会导致遗传变异的增加，从而提高适应极端环境的进化潜力。本论文的研究将探讨重组是否可以记录在一个无融合生殖蕨类谱系。无融合生殖蕨类植物能够进行一种独特的孢子发生（一种在有花植物中不存在的孢子发生），在这种孢子发生中，同源染色体有可能在减数分裂期间配对并重组遗传信息。本研究利用现代基因组学方法结合细胞学研究，旨在确定这些蕨类植物中是否存在这种遗传变异，以及这种现象在自然居群中的可能程度，从而加深对蕨类植物无融合生殖的认识。植物间无融合生殖生物学知识的增加不仅与蕨类植物遗传变异的进化和生态学研究有关，而且对农业和作物科学具有广泛的影响。