Abstract
Cotton fiber development is a complex biological process that many genes are involved. Thousands of genes have been identified as relevant to fiber development through transcriptomic analysis, genetic mapping, and comparative orthologous gene analysis. Among them, about 80 have been characterized for their actual roles in fiber development by transgenic analysis. The causative genes of five mutations related to fiber initiation (N1, n2, li3), elongation (Li1), or secondary cell wall assembly (im) were identified via genetic mapping. About 2000 fiber quantitative trait loci (QTL) were identified using a variety of populations and genetic mapping methods. A few stable fiber QTL were repeatedly identified by different research groups, and some of them are being used in practical breeding. In this chapter, the accomplishments and progress in the area of identifying and characterizing fiber genes are reviewed. The characterized fiber genes are summarized according to their primary roles in fiber development. Stable fiber QTL that are valuable to breeding are provided. The author also provides a future perspective and research gaps that should be future research priorities in order to better understand cotton fiber development.
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