Differential Expression of Two Flavonoid 3′-Hydroxylase cDNAs Involved in Biosynthesis of Anthocyanin Pigments and 3-Deoxyanthocyanidin Phytoalexins in Sorghum | Zendy

Chun-Hat Shih | Zendy; Ivan K. Chu | Zendy; Wing Kin Yip | Zendy; Clive Lo | Zendy

Open Access

Differential Expression of Two Flavonoid 3′-Hydroxylase cDNAs Involved in Biosynthesis of Anthocyanin Pigments and 3-Deoxyanthocyanidin Phytoalexins in Sorghum

Author(s) -

Chun-Hat Shih,

Ivan K. Chu,

Wing Kin Yip,

Clive Lo

Publication year - 2006

Publication title -

plant and cell physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.975

H-Index - 152

eISSN - 1471-9053

pISSN - 0032-0781

DOI - 10.1093/pcp/pcl003

Subject(s) - flavonoid biosynthesis , flavonoid , sorghum , gene , anthocyanin , biology , mutant , gene expression , enzyme , phytoalexin , biochemistry , microbiology and biotechnology , botany , transcriptome , agronomy , resveratrol , antioxidant

Three unique sorghum flavonoid 3'-hydroxylase (F3'H) cDNAs (SbF3'H1, SbF3'H2 and SbF3'H3) were discovered through bioinformatics analysis. Their encoded proteins showed >60% identity to the Arabidopsis TT7 (F3'H) protein. Overexpression of SbF3'H1 or SbF3'H2 restored the ability of tt7 mutants to produce 3'-hydroxylated flavonoids, establishing their roles as functional F3'H enzymes. In sorghum mesocotyls, SbF3'H1 expression was involved in light-specific anthocyanin accumulation while SbF3'H2 expression was involved in pathogen-specific 3-deoxyanthocyanidin synthesis. No SbF3'H3 expression was detected in all tissues examined. The sorghum mesocotyls represent a good system for investigation of differential regulation of F3'H genes/alleles responding to different external stimuli.

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