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Enzymes of the chalcone synthase (CHS) family participate in the synthesis of multiple secondary metabolites in plants, fungi and bacteria. CHS showed a significant correlation with the accumulation patterns of anthocyanin. The peel color, which is primarily determined by the content of anthocyanin, is an economically important trait for eggplants that is affected by heat stress. A total of 7  CHS  ( SmCHS1-7 ) putative genes were identified in a genome-wide analysis of eggplants ( S .  melongena  L.). The  SmCHS  genes were distributed on 7 scaffolds and were classified into 3 clusters. Phylogenetic relationship analysis showed that 73  CHS  genes from 7 Solanaceae species were classified into 10 groups.  SmCHS5 ,  SmCHS6  and  SmCHS7  were continuously down-regulated under 38°C and 45°C treatment, while  SmCHS4  was up-regulated under 38°C but showed little change at 45°C in peel. Expression profiles of key anthocyanin biosynthesis gene families showed that the PAL, 4CL and AN11 genes were primarily expressed in all five tissues. The CHI, F3H, F3’5’H, DFR, 3GT and bHLH1 genes were expressed in flower and peel. Under heat stress, the expression level of 52 key genes were reduced. In contrast, the expression patterns of eight key genes similar to  SmCHS4  were up-regulated at a treatment of 38°C for 3 hour. Comparative analysis of putative CHS protein evolutionary relationships,  cis -regulatory elements, and regulatory networks indicated that  SmCHS  gene family has a conserved gene structure and functional diversification.  SmCHS  showed two or more expression patterns, these results of this study may facilitate further research to understand the regulatory mechanism governing peel color in eggplants.

plos one

Chalcone synthase (CHS) family members analysis from eggplant (Solanum melongena L.) in the flavonoid biosynthetic pathway and expression patterns in response to heat stress