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Chalcone isomerase (CHI) is a key component of phenylalanine metabolism that can produce a variety of flavonoids. However, little information and no systematic analysis of  CHI  genes is available for cotton. Here, we identified 33  CHI  genes in the complete genome sequences of four cotton species ( Gossypium arboretum  L.,  Gossypium raimondii  L.,  Gossypium hirsutum  L., and  Gossypium barbadense  L.). Cotton CHI proteins were classified into two main groups, and whole-genome/segmental and dispersed duplication events were important in  CHI  gene family expansion. qRT-PCR and semiquantitative RT-PCR results suggest that  CHI  genes exhibit temporal and spatial variation and respond to infection with  Fusarium  wilt race 7. A preliminary model of  CHI  gene involvement in cotton evolution was established. Pairwise comparison revealed that seven  CHI  genes showed higher expression in cultivar 06-146 than in cultivar Xinhai 14. Overall, this whole-genome identification unlocks a new approach to the comprehensive functional analysis of the  CHI  gene family, which may be involved in adaptation to plant pathogen stress.

genes

The Chalcone Isomerase Family in Cotton: Whole-Genome Bioinformatic and Expression Analyses of the Gossypium barbadense L. Response to Fusarium Wilt Infection