Journal
BIOLOGIA PLANTARUM
Volume 57, Issue 1, Pages 49-55Publisher
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s10535-012-0265-1
Keywords
anthocyanin transport; Capsicum annuum; cDNA library; pericarp
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Funding
- National Council for Science and Technology (Conacyt
- Mexico)
- Fondos Mixtos Guanajuato [GTO-04-C02-24, GTO-2005-C02-50]
- Conacyt [55264]
- SAGARPA [11806]
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Chili pepper (Capsicum annuum L.) cv. Arbol and Uvilla fruits differing in anthocyanin contents were analyzed to characterize the accumulation patterns. The maximum accumulation of the aglycon delphinidin occurred 20 days postanthesis (DPA) with higher content in Uvilla than in Arbol fruits. Regarding the cDNA library, 9 186 cDNA clones were selected. The clones with high homology to genes concerning anthocyanin biosynthesis, such as encoding chalcone synthase (CHS), chalcone isomerase (CHI), flavanone 3-hydroxylase (F3H), flavonoid 3',5'-hydroxylase (F3'5'H), dihydroflavonol 4-reductase (DFR), anthocyanidin synthase (ANS), UDP Glc-flavonoid 3-O-gluco-syl transferase (UFGT), and also those possibly involved in anthocyanin transport into the vacuoles, an anthocyanin permease (ANP) and a glutathione S-transferase (GST) were used for gene expression analysis. In general, the expression of all investigated genes was developmentally regulated in both Arbol and Uvilla. CHS and CHI transcripts were expressed at the maximal level at 10 DPA, and then consistently declined throughout fruit development. F3'5'H, DFR, UFGT and GST expression exhibited a positive correlation with anthocyanin accumulation, and the highest transcript levels were detected prior to or by the time of maximum anthocyanin accumulation, depending on the chili pepper type. Pericarp fruit tissues from cv. Tampiqueo 74, an anthocyanin non-accumulator, also showed CHS, CHI, F3H, ANS and ANP expression at some developmental stages.
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