气候变化领域集成服务门户(CCPortal): Eight-year blight (Cryphonectria parasitica) resistance of backcross-generation American chestnuts (Castanea dentata) planted in the southeastern United States

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DOI	10.1016/j.foreco.2018.10.060
	Eight-year blight (Cryphonectria parasitica) resistance of backcross-generation American chestnuts (Castanea dentata) planted in the southeastern United States
	Clark S.L.; Schlarbaum S.E.; Saxton A.M.; Baird R.
发表日期	2019
ISSN	0378-1127
起始页码	153
结束页码	161
卷号	433
英文摘要	The loss of American chestnut (Castanea dentata) in eastern North America to chestnut blight, a disease caused by the fungal pathogen (Cryphonectria parasitica), has devastated ecological and utilitarian processes and functions. A backcross breeding approach has been developed to confer disease resistance to hybrid seedlings, and forest reintroduction trials will provide important information on performance and durability of resistance in real-world forest conditions. Three plantings were established in 2009 in mesic, even-aged regeneration harvests (site index averaged 23 m for Quercus rubra) and were examined for eight-year blight resistance. These plantings are the first forest field trials to test blight resistance of the most advanced breeding generation currently available, the third generation of the third backcross (BC3F3), against less advanced breeding generations (BC1F3, BC2F3), disease-resistant Chinese chestnut (C. mollissima), and disease-susceptible American chestnut. We also examined if C. parasitica infection was related to tree size and growth. The pathogen infected 36 percent of trees across locations by year 8, but 31 percent of trees died prior to detection of infection. Non-pathogen related mortality was probably due to factors that are typical of hardwood plantings, including repeated deer browsing and native and non-native pest damage. The BC3F3 generation exhibited resistance more similar to the Chinese chestnut than the American chestnut, but exhibited significantly lower resistance than Chinese chestnut at the location with the highest blight incidence; genetic family differences among BC3F3 progeny were significant at this location. Interactions between planting location and breeding generation affected resistance rankings, suggesting additional or longer-term testing is needed to determine resistance of a particular breeding line across a variety of sites. Probability of disease incidence was positively related to ground-line diameter (GLD), but this relationship depended on location and breeding type. At two locations, American chestnut had 50 percent probability of C. parasitica infection when GLD was approximately 70 mm, and the BC3F3 had 50 percent probability when GLD was between 93 and 126 mm. The Chinese chestnut maintained low probability of disease incidence (<35 percent) across all GLD sizes, regardless of location. While a relatively high level of disease resistance was associated with the most advanced breeding generation, BC3F3, the plantings are too young to determine durable blight resistance. © 2018
英文关键词	American chestnut; Artificial regeneration; Backcross breeding; Disease resistance; Genetic family; Restoration
语种	英语
scopus关键词	Image reconstruction; Location; Probability; Reforestation; American chestnut; Artificial regeneration; Backcross breeding; Disease resistance; Genetic family; Fruits; deciduous tree; disease resistance; environmental restoration; fungal disease; infectious disease; mortality; parasite infestation; performance assessment; pest damage; regrowth; Breeding; Castanea; Fruits; Probability; Reforestation; Resistance; Seeding; United States; Castanea dentata; Castanea mollissima; Cervidae; Cryphonectria parasitica; Quercus rubra
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156290
作者单位	Southern Research Station, U.S. Department of Agriculture Forest Service, 2431 Joe Johnson Dr., Rm 274 Ellington Plant Science, Knoxville, TN 37996-4563, United States; Department of Forestry, Wildlife, and Fisheries, The University of Tennessee, 2431 Joe Johnson Dr., Rm 274 Ellington Plant Science, Knoxville, TN 37996-4563, United States; Animal Science Department, The University of Tennessee, 208C Brehm Animal Science Building, Knoxville, TN 37996-4574, United States; Department of Biochemistry, Molecular Biology, Entomology, and Plant Pathology, Mississippi State University, Box 9655, Mississippi State, MS 39762, United States
推荐引用方式 GB/T 7714	Clark S.L.,Schlarbaum S.E.,Saxton A.M.,et al. Eight-year blight (Cryphonectria parasitica) resistance of backcross-generation American chestnuts (Castanea dentata) planted in the southeastern United States[J],2019,433.
APA	Clark S.L.,Schlarbaum S.E.,Saxton A.M.,&Baird R..(2019).Eight-year blight (Cryphonectria parasitica) resistance of backcross-generation American chestnuts (Castanea dentata) planted in the southeastern United States.Forest Ecology and Management,433.
MLA	Clark S.L.,et al."Eight-year blight (Cryphonectria parasitica) resistance of backcross-generation American chestnuts (Castanea dentata) planted in the southeastern United States".Forest Ecology and Management 433(2019).