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Timing of fungal invasion using host's ripening hormone as a signal
Year:
1994
Authors :
Flaishman, Moshe
;
.
Volume :
91
Co-Authors:
Flaishman, M.A., Ohio State University, Biotechnology Center, 1060 Carmack Road, Columbus, OH 43210, United States
Kolattukudy, P.E., Ohio State University, Biotechnology Center, 1060 Carmack Road, Columbus, OH 43210, United States
Facilitators :
From page:
6579
To page:
6583
(
Total pages:
5
)
Abstract:
In many postharvest fruit diseases, fungi remain latent until the fruit ripens. How the fungus times its infection at ripening of the host is not known. We have found that the volatiles produced by the climacteric tomato, avocado, and banana fruits induce germination and appressorium formation in Colletotrichum gloeosporioides and Colletotrichum musae. Exposure of the spores of these fungi to ethylene, the host's ripening hormone, at ≤1 μl/liter, caused germination, branching of the germ tube, and formation of up to six appressoria from a single spore. Propylene, an ethylene analog, but not the hydrocarbon gas methane was able to induce spore germination and multiple appressorium formation. The ethylene effect on the fungi appears to be a plant-like response as it was inhibited by silver ion and 2,5- norbornadiene; the inhibition by the latter could be reversed by higher ethylene concentrations. Ethylene induced germination and appressorium formation in the Colletotrichum sp. penetrating climacteric fruit but not in other Colletotrichum strains. That the ethylene induction of multiple appressorium formation could be relevant to postharvest infection was indicated by the observation that C. gloeosporioides spores formed multiple appressoria on normally ripening tomato that produces ethylene, whereas on transgenic tomato and orange, fruits incapable of producing ethylene, exogenous ethylene was required to induce multiple appressorium formation and lesion formation. These results strongly suggest that these fungi must have coevolved to develop a mechanism to use the host's ripening hormone as a signal to differentiate into multiple infection structure and thus time the infection process.
Note:
Related Files :
Agriculture
article
fungus growth
germination
mycosis
nonhuman
phytohormone
signal transduction
sporogenesis
Show More
Related Content
More details
DOI :
10.1073/pnas.91.14.6579
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
21523
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:44
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Scientific Publication
Timing of fungal invasion using host's ripening hormone as a signal
91
Flaishman, M.A., Ohio State University, Biotechnology Center, 1060 Carmack Road, Columbus, OH 43210, United States
Kolattukudy, P.E., Ohio State University, Biotechnology Center, 1060 Carmack Road, Columbus, OH 43210, United States
Timing of fungal invasion using host's ripening hormone as a signal
In many postharvest fruit diseases, fungi remain latent until the fruit ripens. How the fungus times its infection at ripening of the host is not known. We have found that the volatiles produced by the climacteric tomato, avocado, and banana fruits induce germination and appressorium formation in Colletotrichum gloeosporioides and Colletotrichum musae. Exposure of the spores of these fungi to ethylene, the host's ripening hormone, at ≤1 μl/liter, caused germination, branching of the germ tube, and formation of up to six appressoria from a single spore. Propylene, an ethylene analog, but not the hydrocarbon gas methane was able to induce spore germination and multiple appressorium formation. The ethylene effect on the fungi appears to be a plant-like response as it was inhibited by silver ion and 2,5- norbornadiene; the inhibition by the latter could be reversed by higher ethylene concentrations. Ethylene induced germination and appressorium formation in the Colletotrichum sp. penetrating climacteric fruit but not in other Colletotrichum strains. That the ethylene induction of multiple appressorium formation could be relevant to postharvest infection was indicated by the observation that C. gloeosporioides spores formed multiple appressoria on normally ripening tomato that produces ethylene, whereas on transgenic tomato and orange, fruits incapable of producing ethylene, exogenous ethylene was required to induce multiple appressorium formation and lesion formation. These results strongly suggest that these fungi must have coevolved to develop a mechanism to use the host's ripening hormone as a signal to differentiate into multiple infection structure and thus time the infection process.
Scientific Publication
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