Committee Chair
Craddock, James Hill
College
College of Arts and Sciences
Publisher
University of Tennessee at Chattanooga
Place of Publication
Chattanooga (Tenn.)
Abstract
An F2 population of second backcross interspecific hybrid chestnut trees (BC2F2) and the progeny of the Chattanooga Chestnut Tree Project (CCTP) breeding program were exposed to three isogenic strains of Cryphonectria parasitica. Strain Ep155 (virus-free) was used to screen the 4- 7 year old chestnut trees for resistance to chestnut blight disease. Two virus-containing, hypovirulent strains, Ep155(CHV1-Euro7) and Ep155(CHV1-Ep713), were used to investigate interactions of host disease resistance and expression ofhypovirulence. The BC2F2 population varied from highly susceptible to highly resistant, as measured by Ep155 (virus-free) canker length at 95 days. Disease resistance in the CCTP population varied from highly susceptible to intermediately resistant. Ep155(CHV1-Ep713) cankers were significantly smaller than cankers caused by Epl55(CHV1-Euro7) and Ep155 (virusfree). Investigation of the interactions of host disease resistance and expression of hypovirulence is currently in progress at the CCTP breeding orchard.
Acknowledgments
I wish to thank all those who helped me complete my Master of Science degree in Environmental Science. I am very grateful to Dr. J. Hill Craddock, the chairperson of my thesis committee, for his willingness to teach me, all his help in the orchards measuring cankers, and his friendship. I thank Dr. Fred Hebard for being on my thesis committee and for all of his help, advice, and time. I also thank Dr. David Abom for being on my thesis committee and for his helpful insight. I thank Dr. Mark Double and Dr. Bill MacDonald for providing me with the fungal isolates used in this study and for their advice. I am thankful to my brother Mark Alexander for his priceless help and encouragement throughout graduate school and my chestnut research. Finally, I would like to thank my wife Carrie for being my number one supporter.
Degree
M. S.; A thesis submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science.
Date
12-2003
Subject
American chestnut; Plants--Disease and pest resistance--Genetic aspects; Selection (Plant breeding)
Discipline
Natural Resources and Conservation
Document Type
Masters theses
DCMI Type
Text
Extent
ix, 89 leaves
Language
English
Call Number
LB2369.2 .A439 2003
Rights
http://rightsstatements.org/vocab/InC/1.0/
Recommended Citation
Alexander, Stephen Henry, "Host-pathogen interactions in a segregating population of BC2F2 hybrid Castanea dentata and other chesnut hybirds after exposure to hypovirus-containing and hypvirus-free strains of Cryphonectria parasitica" (2003). Masters Theses and Doctoral Dissertations.
https://scholar.utc.edu/theses/882
Department
Dept. of Biology, Geology, and Environmental Science