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Genotypic variation in growth traits of Toona ciliata families in Guangdong province

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Author: Shijun Wu

Abstract: Abstract: The height and diameter at breast height were assessed for 169 Toona ciliata families at age 18 months. Analysis of variance showed that there were highly significant differences on height and diameter at breast height in Xinhui with 4.60 to 15.08 of F value, indicating the family and replicate could affect the growth. The significant differences were also found on height and diameter at breast height among provinces and replicates, however there was no significant differences on diameter at breast height among families in Lianping, indicating the nearly growth speed on diameter at breast height. The coefficient of genotypic variation of height and diameter at breast height were 42.19% and 44.89% in Xinhui while those were 42.10% and 44.23% in Lianping. Heritabilities were were 0.88 for height, 0.90 for diameter at breast height in Xinhui and 0.97 for height, 0.37 for diameter at breast height in Lianping. Family 169, 143, 154, 149 and 153 had significantly slowest growth whereas family 8, 1, 4, 116 and 39 were the higher growing in Xinhui. Family 134, 11, 86, 121 and 43 had significantly slowest growth whereas family 123, 24, 89, 105 and 51 were the higher growing on height in Lianping. Furthermore, the mean values of height were nearly in two sites, however the diameter at breast height in Xinhui were bigger than Lianping probably due to the insect pest.

Keywords: Keywords: genetic variation; Toona ciliata families; growth traits

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