A WD40 Repeat Protein from Medicago truncatula Is Necessary for Tissue-Specific Anthocyanin and Proanthocyanidin Biosynthesis But Not for Trichome Development

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Article discussing how WD40 repeat protein from Medicago truncatula is necessary for tissue-specific anthocyanin and proanthocyanidin biosynthesis but not for trichome development.

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17 p. : col. ill.

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Pang, Yongzhen; Wenger, Jonathan P.; Saathoff, Katie; Peel, Gregory J.; Wen, Jiangqi; Huhman, David et al. November 2009.

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Article discussing how WD40 repeat protein from Medicago truncatula is necessary for tissue-specific anthocyanin and proanthocyanidin biosynthesis but not for trichome development.

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17 p. : col. ill.

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Abstract: WD40 repeat proteins regulate biosynthesis of anthocyanins, proanthocyanidins (PAs), and mucilage in the seed and the development of trichomes and root hairs. We have cloned and characterized a WD40 repeat protein gene from Medicago truncatula (MtWD40-1) via a retrotransposon-tagging approach. Deficiency of MtWD40-1 expression blocks accumulation of mucilage and a range of phenolic compounds, including PAs, epicatechin, other flavonoids, and benzoic acids, in the seed, reduces epicatechin levels without corresponding effects on other flavonoids in flowers, reduces isoflavone levels in roots, but does not impair trichome or root hair development. MtWD40-1 is expressed constitutively, with highest expression in the seed coat, where its transcript profile temporally parallels those of PA biosynthetic genes. Transcript profile analysis revealed that many genes of flavonoid biosynthesis were down-regulated in a tissue-specific manner in M. truncatula lines harboring retrotransposon insertions in the MtWD40-1 gene. MtWD40-1 complemented the anthocyanin, PA, and trichome phenotypes of the Arabidopsis (Arabidopsis thaliana) transparent testa glabrous1 mutant. We discuss the function of MtWD40-1 in natural product formation in M. truncatula and the potential use of the gene for engineering PAs in the forage legume alfalfa (Medicago sativa).

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Copyright © 2009 American Society of Plant Biologists. The following article appeared in Plant Physiology, v. 151, pp. 1114-1129, http:/​/​dx.​doi.​org/​10.​1104/​pp.​109.​144022

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  • Plant Physiology, 2009, Rockville: American Society of Plant Biologists, pp. 1114-1129

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  • Publication Title: Plant Physiology
  • Volume: 151
  • Issue: 3
  • Page Start: 1114
  • Page End: 1129
  • Peer Reviewed: Yes

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  • November 2009

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  • Sept. 12, 2014, 9:22 a.m.

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Pang, Yongzhen; Wenger, Jonathan P.; Saathoff, Katie; Peel, Gregory J.; Wen, Jiangqi; Huhman, David et al. A WD40 Repeat Protein from Medicago truncatula Is Necessary for Tissue-Specific Anthocyanin and Proanthocyanidin Biosynthesis But Not for Trichome Development, article, November 2009; [Rockville, Maryland]. (https://digital.library.unt.edu/ark:/67531/metadc335295/: accessed April 9, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT College of Arts and Sciences.