Gene Expression During Pollen Development
Because of allelic segregation at meiosis, post meiotic gene expression can result in considerable genetic variability in the pollen population even from single plants, and thus offers opportunities for selection among male gametophytes. Due to the haploid state and the large population size, male gametophytic selection (MGS) can be extremely efficient and represent an important factor in the high evolution rate of Angiosperms. Moreover, if used in a controlled way, it can be a powerful tool for manipulating the genetic makeup of many useful plant species. Prerequisites for this to occur are: i) that a considerable amount of genes are expressed postmeiotically, thus producing a large number of pollen phenotypes, and ii) that many of these genes are expressed also in the sporophytic phase. Only in this latter case MGS is expected to exert a significant effect on the resulting sporophytic generation.
KeywordsStarch Maize Polypeptide Sorghum Populus
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