Identification of an Abscisic Acid Gene Cluster in the Grey Mold Botrytis cinerea

Author:

Siewers Verena1,Kokkelink Leonie1,Smedsgaard Jørn2,Tudzynski Paul1

Affiliation:

1. Westfälische Wilhelms-Universität, Institut für Botanik, Schlossgarten 3, D-48149 Münster, Germany

2. Bio-Centrum DTU, Building 221, Søltofts Plads, DK-2800 Lyngby, Denmark

Abstract

ABSTRACT Like several other phytopathogenic fungi, the ascomycete Botrytis cinerea is known to produce the plant hormone abscisic acid (ABA) in axenic culture. Recently, bcaba1 , the first fungal gene involved in ABA biosynthesis, was identified. Neighborhood analysis of bcaba1 revealed three further candidate genes of this pathway: a putative P450 monooxygenase-encoding gene ( bcaba2 ), an open reading frame without significant similarities ( bcaba3 ), and a gene probably coding for a short-chain dehydrogenase/reductase ( bcaba4 ). Targeted inactivation of the genes proved the involvement of BcABA2 and BcABA3 in ABA biosynthesis and suggested a contribution of BcABA4. The close linkage of at least three ABA biosynthetic genes is strong evidence for the presence of an abscisic acid gene cluster in B. cinerea .

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

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