Genetic variation in height growth curves observed in three clonal tests of sugi (Cryptomeria japonica D. Don) in Kyushu |
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| Authors: | Susumu Kurinobu Tadao Toda |
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| Institution: | (1) Forest Tree Breeding Center, Kyushu Regional Breeding Office, 861-1102 Kumamoto, Japan |
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| Abstract: | Genetic variation in the height growth curves was investigated by analyzing data from three clonal trials of sugi (Crytomeria japonica D. Don) in Kyushu. Average height of twelve clones measured at each of five years until 30 years of age were fitted to the
Chapman-Richards function with two parameters model. Clonal variation in the two parameters (an upper asymptote and a rate
of growth parameter) was statistically significant across the tests, indicating that height growth pattern is under genetic
control. The type of growth curve was clearly classified with the two parameters and agreed with the empirical classifications
of the growth habit of local varieties. The rate of growth parameter was correlated with total height up to 20 years of age,
while the upper asymptote was correlated only with the last ten years’ increment from 21 to 30 years where the clonal repeatability
was decreasing. This indicates that a clonal selection for long rotation management system would not be reliable unless the
height is measured accurately with more advanced devices or it is adjusted by the current increment of diameter. |
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| Keywords: | Chapman-Richards function clonal test Cryptomeria japonica genetic variation height growth curve |
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