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Leaf physiology and morphology of Castanea dentata (Marsh) Borkh., Castanea mollissima Blume, and three backcross breeding generations planted in the southern Appalachians, USAAuthor(s): Benjamin O. Knapp; G. Geoff Wang; Stacy L Clark; Lauren S. Pile; Scott E. Schlarbaum
Source: New Forests 45(2): 283-293.
Publication Series: Scientific Journal (JRNL)
Station: Southern Research Station
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DescriptionBackcross breeding programs have been used to transfer disease resistance and other traits from one forest tree species to another in order to meet restoration objectives. Evaluating the field performance of such material is critical for determining the success of breeding programs. In eastern North America, The American Chestnut Foundation has a backcross breeding program that uses Chinese chestnut (Castanea mollissima Blume) to introduce resistance of the fungal pathogen chestnut blight [Cryphonectria parasitica (Murr.) Barr.] to the native American chestnut [Castanea dentata (Marsh.) Borkh.]. We compared physiological and morphological characteristics among seedlings of American chestnut, Chinese chestnut, and BC1F3, BC2F3, and BC3F3 hybrid chestnuts during their fourth growing season after field-planting. American chestnut and the BC3F3 breeding generation displayed photosynthetic light-response curves that were similar to each other but different from Chinese chestnut. Rates of photosynthesis were higher for American chestnut and the BC3F3 breeding generation when compared to Chinese chestnut for light levels >800 umol m-2 -1 photosynthetic photon flux density and for maximum photosynthetic capacity. Leaf morphology variables were not different between American chestnut and any of the breeding generations, but leaf area (on a per leaf basis) of Chinese chestnut was lower than that of any other chestnut type. Our results suggest that backcross breeding can be used to transfer desirable traits for restoration of native species threatened by non-native pathogens.
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CitationKnapp, Benjamin O.; Wang, G. Geoff; Clark, Stacy L; Pile, Lauren S.; Schlarbaum, Scott E. 2014. Leaf physiology and morphology of Castanea dentata (Marsh) Borkh., Castanea mollissima Blume, and three backcross breeding generations planted in the southern Appalachians, USA. New Forests 45(2): 283-293. 11 p.
KeywordsBackcross breeding, Castanea dentata, Light response curve, Species restoration, tree improvement
- Lessons from the field: The first tests of restoration American chestnut (Castanea dentata) seedlings planted in the Southern Region
- Making history: Field testing of blight-resistant American chestnut (Castanea dentata) in the Southern Region
- Nut cold hardiness as a factor influencing the restoration of American chestnut in northern latitudes and high elevations
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