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Molecules 2015, 20(2), 2388-2404; doi:10.3390/molecules20022388

A Sorghum MYB Transcription Factor Induces 3-Deoxyanthocyanidins and Enhances Resistance against Leaf Blights in Maize

1
Department of Plant Science, The Pennsylvania State University, University Park, PA 16802, USA
2
Intercollege Graduate Degree Program in Plant Biology, Pennsylvania State University, University Park, PA 16802, USA
3
Botany Department, Faculty of Science, Mansoura University, AlMansoura, 35516, Egypt
4
MU Informatics Institute, University of Missouri, Columbia, MO 65201, USA
These authors contributed equally to the work.
*
Author to whom correspondence should be addressed.
Academic Editor: Philippe Jeandet
Received: 14 October 2014 / Accepted: 22 January 2015 / Published: 30 January 2015
(This article belongs to the Special Issue Phytoalexins: Current Progress and Future Prospects)
View Full-Text   |   Download PDF [871 KB, uploaded 30 January 2015]   |  

Abstract

Sorghum responds to the ingress of the fungal pathogen Colletotrichum sublineolum through the biosynthesis of 3-deoxyanthocyanidin phytoalexins at the site of primary infection. Biosynthesis of 3-deoxyanthocyanidins in sorghum requires a MYB transcription factor encoded by yellow seed1 (y1), an orthologue of the maize gene pericarp color1 (p1). Maize lines with a functional p1 and flavonoid structural genes do not produce foliar 3-deoxyanthocyanidins in response to fungal ingress. To perform a comparative metabolic analysis of sorghum and maize 3-deoxyanthocyanidin biosynthetic pathways, we developed transgenic maize lines expressing the sorghum y1 gene. In maize, the y1 transgene phenocopied p1-regulated pigment accumulation in the pericarp and cob glumes. LC-MS profiling of fungus-challenged Y1-maize leaves showed induction of 3-deoxyanthocyanidins, specifically luteolinidin. Y1-maize plants also induced constitutive and higher levels of flavonoids in leaves. In response to Colletotrichum graminicola, Y1-maize showed a resistance response. View Full-Text
Keywords: anthracnose; 3-deoxyanthocyanidins; Colletotrichum; flavan-4-ols; transgenic maize; yellow seed1 anthracnose; 3-deoxyanthocyanidins; Colletotrichum; flavan-4-ols; transgenic maize; yellow seed1
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ibraheem, F.; Gaffoor, I.; Tan, Q.; Shyu, C.-R.; Chopra, S. A Sorghum MYB Transcription Factor Induces 3-Deoxyanthocyanidins and Enhances Resistance against Leaf Blights in Maize. Molecules 2015, 20, 2388-2404.

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