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Genetic Testing of Vegetative Seed Orchards of Calocedrus formosana: A Clonal Approach
Lee, Sue Ming
|關鍵字:||Taiwan incense cedar|
Genetic Studies of Vegetative Seed Orchards of Calocedrus formosana: A clonal Approach. Sue-Ming Lee. M.Sci. Thesis, Department of Forestry, National Chung Hsing University, Taichung, TAIWAN. June 1997. 50 pp. Two sites of first-generation grafted seed orchards of Taiwan incense cedar (Calocedrus formosana) in central Taiwan were analyzed at ages around 25 ~ 27 years old. First part of this study was to investigate the genetic values of the 30 phenotypically-selected clones in the orchards. Data of three growth traits, tree height, stem diameter at breast height (DBH), and basal stem diameter (DBA), were measured directly on the trees in the unrougued seed orchards. Therefore, it is a clonal test. Second part of the study was to investigate potential methods of promoting rooting of cuttings taken from the adult trees in the orchards. Broad-sense heritabiliities (H2) estimates for DBH had highest value (0.21), while DBA and DBH had highest phenotypic correlation (0.94). Genetic correlation of the growht traits between the two sites were around 0.71 to 0.78. Genetic gain of DBH and DBA could be as high as 10% when selection intensity (i) was 2. Second part of the study was to investigate the impacts of various methods (cutting collection time, growth hormone concentration, etc.) to promote rooting. Cuttings collected in June and treated with NAA 2,000ppm(Rootone? showed in average highest rooting percentage. However, the rooting percentage (6%) was too small to draw any meaningful conclusion at the moment.
|Appears in Collections:||森林學系|
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