Abstract:

Progenies of two test materials grown in Chun'an county of Zhejiang Province derived from different Pinus massonianatester strains were used for genetic analysis of growth traits. The 11year old progeny of test materialⅠwas derived from randomly selected parents and the 10 year old progeny of test materialⅡwas derived from superior parents. Results showed that general combining ability (GCA) and specific combining ability (SCA) of the two materials were significant effective in tree height, DBH and stem volume. For test material Ⅰ, growth traits of test material Ⅰ were controlled mainly by additive gene effects and secondly by the dominant gene effects. To the contrast, growth traits of test material Ⅱ were controlled mainly by the dominant gene effects and secondly by the additive gene effects. Based on the GCA value of stem volume, 4 superior female parents and 2 superior male parents were selected for the two test materials respectively. Based on total combining ability(TCA) value of stem volume for different crosses, 10 superior combinations were selected for the two test materials respectively, and their average gains of stem volume were 32.20% and 33.90% respectively compared with the test material mean, 52.44% and 103.69% respectively compared with local commercial variety. For the two test materials, fullsib family heritability for height, DBH and volume was 0.881 9, 0.917 3 and 0.920 4, and 0.561 4, 0.664 3 and 0.676 9 respectively, indicating that these growth traits were under strong genetic control.

Key words: Pinus massoniana, tester strain, progeny test, combining ability, heritability