Seed Vigor of Different Half-sib Families in Betula schmidtii
LIN Lin, GAO Yu-Ting, CHENG Fu-Shan, XIN Ben-Hua, WANG Gui-Chun, XIA Fu-Cai, MU Huai-Zhi
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Seed vigor can be applied to predict the growth and adaptability of sapling, which is usually taken as an important evaluation index for seed trees. Betula schmidtii as one of the hardest tree species in northeast forest area, the seed vigor has not been reported. The seed vigor of different families was compared, and the seed trees were preliminarily evaluated, which could provide reference for selecting B.schmidtii superior family. Nested ANOVA test, heritability estimation, multiple comparison, correlation analysis on thousand seed wright, germination rate, germination energy, germination index, vigor index, emergence rate and robust rate were conducted by taking 30 half-sib families from Jiaohe, Ji'an and Hunchun in B.schmidtii, and principal component analysis was used to evaluate comprehensively the tested families. There was significant difference in robust rate and extremely significant difference in vigor index among seed sources, and there were significant or extremely significant family effects for all studied traits. Except emergence rate and robust rate, the family heritability in each of the other traits was higher than 0.68. The positive correlation in all studied traits was significant or extremely significant in different families. Based on the results of principal component analysis, JH6, JA1, JA7, JH10, JH3, HC1 and HC10 were identified as the superior families. On average, the seed wright, germination rate, germination energy, germination index, vigor index, emergence rate and robust rate of superior families were 3.87%, 30.29%, 30.22%, 31.99%, 58.22%, 11.88% and 30.60% higher than those of the 30 families, respectively. We recommend the seed trees of these superior families as preferred seed trees in the future.