| Abstract: | A nonpathogenic mutant of Colletotrichum magna (path-1) was previously shown to protect watermelon (Citrullus lanatus) and cucumber (Cucumis sativus) seedlings from anthracnose disease elicited by wild-type C. magna. Disease protection was observed in stems of path-1-colonized cucurbits but not in cotyledons, indicating that path-1 conferred tissue-specific and/or localized protection. Plant biochemical indicators of a localized and systemic (peroxidase, phenylalanine ammonia-lyase, lignin, and salicylic acid) ‘plant-defense‘ response were investigated in anthracnose-resistant and -susceptible cultivars of cucurbit seedlings exposed to four treatments: (1) water (control), (2) path-1 conidia, (3) wild-type conidia, and (4) challenge conditions (inoculation into path-1 conidia for 48 h and then exposure to wild-type conidia). Collectively, these analyses indicated that disease protection in path-1 colonized plants was correlated with the ability of these plants to mount a defense response more rapidly and to equal or greater levels than plants exposed to wild-type C. magna alone. Watermelon plants colonized with path-1 were also protected against disease caused by Colletotrichum orbiculare and Fusarium oxysporum. A model based on the kinetics of plant-defense activation is presented to explain the mechanism of path-1-conferred disease protection. |
| Genre: | Article |
| ProdID: | 70021853 |
| Citation Author: | Redman, R. S.; Freeman, S.; Clifton, D. R.; Morrel, J.; Brown, G.; Rodriguez, R. J. |
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| Citation End Page: | 804 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Plant Physiology |
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| Citation Number Of Pages: | 10 |
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| Citation Search Results Text: | Biochemical analysis of plant protection afforded by a nonpathogenic endophytic mutant of Colletotrichum magna; 1999; Article; Journal; Plant Physiology; Redman, R. S.; Freeman, S.; Clifton, D. R.; Morrel, J.; Brown, G.; Rodriguez, R. J. |
| Citation Start Page: | 795 |
| Citation Volume: | 119 |
| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Biochemical analysis of plant protection afforded by a nonpathogenic endophytic mutant of Colletotrichum magna; 1999; Article; Journal; Plant Physiology; Redman, R. S.; Freeman, S.; Clifton, D. R.; Morrel, J.; Brown, G.; Rodriguez, R. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1999 00:00 -0600 |
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