Real-time RT-PCR expression analysis of chitinase and endoglucanase genes in the three-way interaction between the biocontrol strain Clonostachys rosea IK726, Botrytis cinerea and strawberry.
Clonostachys rosea is a well-known biocontrol agent against Botrytis cinerea, the causal agent of gray mold in strawberry. The activity of cell wall-degrading enzymes might play a significant role for successful biocontrol by C. rosea. The expression pattern of four chitinases, and two endoglucanase genes from C. rosea strain IK726 was analyzed using real-time RT-PCR in vitro and in strawberry leaves during interaction with B. cinerea. Specific primers were designed for beta-tubulin genes from C. rosea and B. cinerea, respectively, and a gene encoding a DNA-binding protein (DBP) from strawberry, allowing in situ activity assessment of each fungus in vitro and during their interaction on strawberry leaves. Growth of B. cinerea was inhibited in all pathogen-antagonist interactions while the activity of IK726 was slightly increased. In all in vitro interactions, four of the six genes were upregulated while no change in expression of two endochitinases was measured. In strawberry leaves, the chitinase genes were upregulated 2-12-fold, except one of the endochitinases, whereas no change in expression of the two endoglucanases was measured. The results suggest that three out of four chitinase genes of IK726 are involved in biocontrol on leaves. This is the first example of monitoring of expression of chitinolytic genes in interactions between biocontrol agents and pathogens in plant material.
Plant Pathology Section, Department of Plant Biology, Faculty of Life Sciences, University of Copenhagen, Copenhagen, Denmark.
Mojtaba
M
Mamarabadi
Birgit
B
Jensen
Dan Funck
DF
Jensen
Mette
M
Lübeck
D000898:Antibiosis; D020171:Botrytis / Q000502:physiology*; D002480:Cellulase / Q000235:genetics* / Q000378:metabolism; D002688:Chitinases / Q000235:genetics* / Q000378:metabolism; D031985:Fragaria / Q000382:microbiology*; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism; D015870:Gene Expression; D006999:Hypocreales / Q000201:enzymology* / Q000235:genetics / Q000502:physiology; D010935:Plant Diseases / Q000382:microbiology*; D018515:Plant Leaves / Q000382:microbiology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015854:Up-Regulation
D005656:Fungal Proteins; D002688:Chitinases; D002480:Cellulase