Massive expansion and differential evolution of small heat shock proteins with wheat (Triticum aestivum L.) polyploidization.

ABSTRACT: Wheat (Triticum aestivum), one of the world's most important crops, is facing unprecedented challenges due to global warming. To evaluate the gene resources for heat adaptation in hexaploid wheat, small heat shock proteins (sHSPs), the key plant heat protection genes, were comprehensively analysed in wheat and related species. We found that the sHSPs of hexaploid wheat were massively expanded in A and B subgenomes with intrachromosomal duplications during polyploidization. These expanded sHSPs were under similar purifying selection and kept the expressional patterns with the original copies. Generally, a strong purifying selection acted on the α-crystallin domain (ACD) and theoretically constrain conserved function. Meanwhile, weaker purifying selection and strong positive selection acted

SUBMITTER: Wang X 

PROVIDER: S-EPMC5451465 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature