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Heat shock protein 70 (Hsp70) plays an essential role in plant growth and development, as well as stress response. Rapeseed  (Brassica napus  L.) originated from recently interspecific hybridization between  Brassica rapa  and  Brassica oleracea . In this study, a total of 47  Hsp70  genes were identified in  B. napus  (A n A n C n C n  genome), including 22 genes from A n  subgenome and 25 genes from C n  subgenome. Meanwhile, 29 and 20  Hsp70  genes were explored in  B. rapa  (A r A r  genome) and  B. oleracea  (C o C o  genome), respectively. Based on phylogenetic analysis, 114 Hsp70 proteins derived from  B. napus ,  B. rapa ,  B. oleracea  and  Arabidopsis thaliana , were divided into 6 subfamilies containing 16 A r -A n  and 11 C o -C n  reliable orthologous pairs. The homology and synteny analysis indicated whole genome triplication and segmental duplication may be the major contributor for the expansion of  Hsp70  gene family. Intron gain of  BnHsp70  genes and domain loss of BnHsp70 proteins also were found in  B. napus , associating with intron evolution and module evolution of proteins after allopolyploidization. In addition, transcriptional profiles analyses indicated that expression patterns of most  BnHsp70  genes were tissue-specific. Moreover,  Hsp70  orthologs exhibited different expression patterns in the same tissue and C n  subgenome biased expression was observed in leaf. These findings contribute to exploration of the evolutionary adaptation of polyploidy and will facilitate further application of  BnHsp70  gene functions.

peerj

Genome-wide identification and characterization of the <i>Hsp70</i> gene family in allopolyploid rapeseed (<i>Brassica napus</i> L.) compared with its diploid progenitors

Genome-wide identification and characterization of the Hsp70 gene family in allopolyploid rapeseed (Brassica napus L.) compared with its diploid progenitors