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Measuring Phytophthora Resistance Phenotypes In Segregating Testcross Families Of Hybrid American Chestnut Trees, Anna C. Robinson
Measuring Phytophthora Resistance Phenotypes In Segregating Testcross Families Of Hybrid American Chestnut Trees, Anna C. Robinson
Honors Theses
Phytophthora root rot (PRR), caused by the oomycete Phytophthora cinnamomi Rands, is a formidable obstacle to the restoration of Castanea dentata Marsh. commonly known as the American chestnut. Genetic resistance to PRR has been observed in Asian species of chestnut including C. mollissima Blume, and in interspecific hybrids between C. mollissima and C. dentata. We hypothesized that root rot resistance alleles would segregate in a 1:1 ratio within progeny of crosses between PRR resistant F1 hybrids and PRR-susceptible American chestnut trees (first-backcrosses), and that PRR resistance could be successfully passed down to all families of first-backcross hybrids. To test these …