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

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.

Grantor dc:publisher

University of Tennessee at Chattanooga

Author dc:creator

• Alexander, Stephen Henry

Contributors dc:contributor

• Craddock, James Hill
• College of Arts and Sciences

• American chestnut
• Plants--Disease and pest resistance--Genetic aspects
• Selection (Plant breeding)

Licence

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language

English, eng

Identifier

LB2369.2 .A439 2003

OAI identifier oai:identifier

oai:scholar.utc.edu:theses-2061