Abstract
Abscisic acid (ABA) receptor pyrabactin resistance1/PYR1-like/regulatory components of ABA receptor (PYR1/PYL/RCAR) (named PYLs for simplicity) are core regulators of ABA signaling, and have been well studied in Arabidopsis and rice. However, knowledge is limited about the PYL family regarding genome organization, gene structure, phylogenesis, gene expression and protein interaction with downstream targets in Gossypium. A comprehensive analysis of the Gossypium PYL family was carried out, and 21, 20, 40 and 39 PYL genes were identified in the genomes from the diploid progenitor G. arboretum, G. raimondii and the tetraploid G. hirsutum and G. barbadense, respectively. Characterization of the physical properties, chromosomal locations, structures and phylogeny of these family members revealed that Gossypium PYLs were quite conservative among the surveyed cotton species. Segmental duplication might be the main force promoting the expansion of PYLs, and the majority of the PYLs underwent evolution under purifying selection in Gossypium. Additionally, the expression profiles of GhPYL genes were specific in tissues. Transcriptions of many GhPYL genes were inhibited by ABA treatments and induced by osmotic stress. A number of GhPYLs can interact with GhABI1A or GhABID in the presence and/or absence of ABA by the yeast-two hybrid method in cotton.
Highlights
Abscisic acid (ABA) is one of the most important phytohormones
A total of 21, 20, 40 and 39 PYL genes were identified in the genomes of two progenitor diploid species G. arboretum and G. raimondii, and their derived tetraploid species G. hirsutum and G. barbadense, respectively
When more than one Gossypium PYLs had the same ortholog in Arabidopsis, additional numbers followed by a hyphen were applied to distinguish among paralogs of the Gossypium PYLs
Summary
Abscisic acid (ABA) is one of the most important phytohormones. It regulates multiple cellular processes including seed maturation and dormancy, seedling growth, leaf senescence and stomatal movement in plants (Cutler et al, 2010). ABA play crucial roles in plant responses to various stresses such as drought, salinity, osmotic stress, extreme temperature, pathogen attack, and so on (Cutler et al, 2010; Lee & Luan, 2012). When plants are exposed to stresses, dehydrate stress, the level of ABA in tissues prominently increases. How to cite this article Zhang et al (2017), Genome-wide identification of ABA receptor PYL family and expression analysis of PYLs in response to ABA and osmotic stress in Gossypium.
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