Evaluation and Selection of Plus-Trees in a Triploid Betula Platyphylla Seed Orchard
Investigating the phenological characteristics,fruit set,seed traits,and progeny growth of each plus-tree in a seed orchard,and then providing a scientific evaluation to select superior plus-trees for the improvement of the seed orchard is an essential procedure in the amelioration of tree seed orchards.This study focuses on the tetraploids and diploids in a triploid Betula platyphylla seed orchard,conducting a comparative study on the phenological characteristics,fruit set,seed traits,and progeny growth between different families.The results indicate that the flowering period of the plus-trees in the triploid Betula platyphylla seed orchard is generally consistent.The thousand-seed weight and seed vigor indicators of the half-sibling families of Betula platyphylla showed extremely significant differences among different families.There were also extremely significant differences in seedling height and ground diameter among the tetraploid families,with the tetraploid seedlings being generally taller but with a larger ground diameter compared to the diploids,and most tetraploid seedlings had a lower average height than diploids,while their average ground diameter was greater.After a comprehensive analysis of multiple indicators,2-1,2-13,and 2-47 were identified as superior plus-trees in the intensified Betula platyphylla seed orchard.
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