Variation and selection of half-sib families of Falcataria falcata during seedling stage
[Objective]The study aims to explore the genetic variation in seedling growth and nitrogen fixation traits of Falcataria falcata and select fast growing families with strong nitrogen fixation ability.[Method]Seedlings of 1 to 6 months in 37 half-sib families from the 1st generation clonal seed orchard of F.falcata were used as materials.Indicators such as seedling height,ground diameter,relative chlorophyll content,biomass,and number of root nodules were investigated and measured.The methods of genetic variation analysis,correlation analysis and cluster analysis were used to compare growth and select seedlings.[Result]There was no significant difference in growth traits among 1-2 month seedlings in 37 half-sib families,but the height or ground diameter of 4-month seedlings in more than 16 families was significantly better than that of the mixed seeds of mother forests(ck)in Raoping County.The family heritability of seedling height and ground diameter was 0.89-0.90 and 0.84-0.86,respectively,and the genetic progression was 0.118 9-0.221 4 and 0.096 2-0.154 3,respectively,at a selection rate of 30%.There was a highly significant or significant positive correlation between different traits(P＜0.01 or P＜0.05).13 families were selected,accounting for 34%of the population.Compared with the population mean,the realistic gains in seedling height and ground diameter were 27.99%and 12.73%,respectively,and the genetic gains were 24.91%and 10.69%,respectively.Compared with ck,the realistic gains were 62.47%and 41.65%,and the genetic gains were 55.59%and 34.98%,respectively.[Conclusion]The half-sib families of F.falcata have significant genetic variation in growth traits such as seedling height and ground diameter from 4 months of seedling age,and have a high level of family heritability and good selection potential.Based on the synergistic analysis of growth and nitrogen fixation traits,13 excellent families with both seedling growth advantage and efficient nitrogen fixation capacity are selected.[Ch,3 fig.4 tab.23 ref.]
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