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Proc Natl Acad Sci U S A. 1990 May;87(10):3879-83. doi: 10.1073/pnas.87.10.3879.

Corn metabolites affect growth and virulence of Agrobacterium tumefaciens.

Proceedings of the National Academy of Sciences of the United States of America

S V Sahi, M D Chilton, W S Chilton

Affiliations

  1. Department of Botany, North Carolina State University, Raleigh, NC 27695-7612, USA.

PMID: 11607078 PMCID: PMC54007 DOI: 10.1073/pnas.87.10.3879

Abstract

Homogenates of corn seedlings inhibit both growth of Agrobacterium tumefaciens and induction of its Ti plasmid virulence (vir) genes by acetosyringone (AS). The heat-labile inhibitor has been identified as 2,4-dihydroxy-7-methoxy-2H-1,4-benzoxazin-3(4H)-one (DIMBOA), present in 2-week-old seedlings (B73) at a concentration of 1.5 mM or greater. A concentration of 0.3 mM DIMBOA is sufficient to block growth of A. tumefaciens completely for 220 hr. DIMBOA at 0.1 mM concentration completely inhibited vir gene induction by 100 microM AS and reduced growth rate by 50%. Thus, DIMBOA can be expected to have a significant effect on attempts to transform corn by using A. tumefaciens as a vector.

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