Objective To provide reference for the follow-up family selection and variety extension by genetic variation analysis and stability evaluation of the growth traits of Litsea cubeba families.
Method 13 L. cubeba families were used to establish pedigree test forests in Wanzhou of Chongqing Municipality, Jingshan of Hubei Province and Qingliu of Fujian Province, which were designed in randomized complete blocks. The height and ground diameter were measured and analyzed when the forests were 2-years-old, then the growth performance and stability of different L. cubeba families were evaluated by AMMI model.
Result (1) Both the family and site effect of height and ground diameter were significant(0.01 < P < 0.05) or highly significant (P < 0.01), the interaction effect of family and site of ground diameter was significant (0.01 < P < 0.05); the phenotypic variance coefficient of height and ground diameter ranged from 20.98% to 29.27%; the genetic variation coefficient of which ranged from 0.62% to 20.35%; and both the phenotypic and genetic variance coefficient of ground diameter were generally larger than that of height; the family heritability of tree height ranged from 0.003 to 0.578, and the family heritability of ground diameter ranged from 0.455 to 0.806. (2) Both the families JY2 and GX4 performed well in ground diameter and stability.
Conclusion The family and site effect of height and ground diameter are both significant(0.01 < P < 0.05) or highly significant (P < 0.01), there is rich genetic variation. In the family level, the height of tree is genetically controlled by low to medium intensity, and the ground diameter is genetically controlled by medium to high intensity. The growth of different families performs best in Qingliu, followed by Jingshan, and the worst in Wanzhou. The families JY2 and GX4 show good ground diameter performance and high stability.
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