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Population structure and pathogenici...

MacKenzie, Steven John.

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Population structure and pathogenicity of Colletotrichum gloeosporioides from strawberry and noncultivated hosts in Florida.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Population structure and pathogenicity of Colletotrichum gloeosporioides from strawberry and noncultivated hosts in Florida./
Author:	MacKenzie, Steven John.
Description:	147 p.
Notes:	Source: Dissertation Abstracts International, Volume: 67-01, Section: B, page: 0019.
Contained By:	Dissertation Abstracts International67-01B.
Subject:	Agriculture, Plant Pathology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3204434
ISBN:	9780542503887

Population structure and pathogenicity of Colletotrichum gloeosporioides from strawberry and noncultivated hosts in Florida.
MacKenzie, Steven John.

Population structure and pathogenicity of Colletotrichum gloeosporioides from strawberry and noncultivated hosts in Florida. - 147 p.

Source: Dissertation Abstracts International, Volume: 67-01, Section: B, page: 0019.

Thesis (Ph.D.)--University of Florida, 2005.

Colletotrichum crown rot, caused by Colletotrichum gloeosporioides , limits strawberry transplant production in Florida summer nurseries and causes moderate plant losses during the winter season. Marker data have shown that C. gloeosporioides crown isolates are diverse and recombination contributes to this diversity. Glomerella cingulata , the teleomorph of C. gloeosporioides, has been observed on petioles, but the role of the meiotic cycle in crown rot disease is unknown. There is little evidence that the primary inoculum for infections comes from imported transplants or from debris from past seasons. Colletotrichum gloeosporioides has a broad host range and hosts other than strawberry could contribute inoculum. In the current study, isolates from strawberry crowns, noncultivated hosts, and perithecia were characterized using randomly amplified polymorphic DNA markers, AT-rich DNA banding patterns, pathogenicity assays, and laboratory crosses. Genetic data indicated the population from crowns produced recombinant ascospores from perithecia and was found on noncultivated hosts close to fields. Pathogenicity to strawberry was variable among perithecia and noncultivated host isolates, but laboratory crosses indicated that sexual recombination occurred between isolates with different pathogenicity phenotypes. The same C. gloeosporioides population on strawberry was also found on two native hosts at sites distant from strawberry fields. A low frequency of isolates pathogenic to strawberry at these sites relative to sites close to strawberry fields suggests that there was selection for pathogenicity.

ISBN: 9780542503887Subjects--Topical Terms:

1028950
Agriculture, Plant Pathology.

Population structure and pathogenicity of Colletotrichum gloeosporioides from strawberry and noncultivated hosts in Florida.
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020 $a 9780542503887
035 $a (UnM)AAI3204434
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040 $a UnM $c UnM
100 1 $a MacKenzie, Steven John. $3 1912060
245 1 0 $a Population structure and pathogenicity of Colletotrichum gloeosporioides from strawberry and noncultivated hosts in Florida.
300 $a 147 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-01, Section: B, page: 0019.
500 $a Adviser: Lavern W. Timmer.
502 $a Thesis (Ph.D.)--University of Florida, 2005.
520 $a Colletotrichum crown rot, caused by Colletotrichum gloeosporioides , limits strawberry transplant production in Florida summer nurseries and causes moderate plant losses during the winter season. Marker data have shown that C. gloeosporioides crown isolates are diverse and recombination contributes to this diversity. Glomerella cingulata , the teleomorph of C. gloeosporioides, has been observed on petioles, but the role of the meiotic cycle in crown rot disease is unknown. There is little evidence that the primary inoculum for infections comes from imported transplants or from debris from past seasons. Colletotrichum gloeosporioides has a broad host range and hosts other than strawberry could contribute inoculum. In the current study, isolates from strawberry crowns, noncultivated hosts, and perithecia were characterized using randomly amplified polymorphic DNA markers, AT-rich DNA banding patterns, pathogenicity assays, and laboratory crosses. Genetic data indicated the population from crowns produced recombinant ascospores from perithecia and was found on noncultivated hosts close to fields. Pathogenicity to strawberry was variable among perithecia and noncultivated host isolates, but laboratory crosses indicated that sexual recombination occurred between isolates with different pathogenicity phenotypes. The same C. gloeosporioides population on strawberry was also found on two native hosts at sites distant from strawberry fields. A low frequency of isolates pathogenic to strawberry at these sites relative to sites close to strawberry fields suggests that there was selection for pathogenicity.
520 $a Although strawberry transplants for winter production are rarely propagated in Florida, crown rot resistant cultivars could make this desirable. To identify resistant cultivars and to determine if resistance is isolate specific, plant mortality was evaluated for cultivars following inoculation with an isolate differential. Repeatable differences in resistance were observed among cultivars, but no cultivar x isolate interactions. The lack of a cultivar x isolate interaction suggested limited biotrophic interaction between pathogen and host. Crosses using a cultivar with superior resistance and a susceptible cultivar as parents indicated that major genes contributing to resistance could be useful for breeding. In conclusion, it is unlikely that crown rot introductions into nurseries or fields can be prevented in Florida, but resistant cultivars could help make propagation of transplants between seasons possible.
590 $a School code: 0070.
650 4 $a Agriculture, Plant Pathology. $3 1028950
690 $a 0480
710 2 0 $a University of Florida. $3 718949
773 0 $t Dissertation Abstracts International $g 67-01B.
790 1 0 $a Timmer, Lavern W., $e advisor
790 $a 0070
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3204434