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Home Publications Tree Improvement and Genetics Central States Forest Tree Improvement Conference 10th Central States Forest Tree Improvement Conference (1976) Cone Set, Seed Yield, Seed Quality, and Early Seedling Development of S2 Generation Jack Pine

Cone Set, Seed Yield, Seed Quality, and Early Seedling Development of S2 Generation Jack Pine

Self-pollinations were made on 29 S1 1 trees and S1 l x S1 -mix crosses were also made on 24 of these she S 1 trees. Open-pollinated progenies from seed on the S 1 trees were also analyzed. Eight of the S l self-pollinated trees and 6 of the S1 x S 1 -mix crosses had complete cone abortion. About 69% of the cones in the self-pollinated S1 trees and 58% of cones in the S1 l x S 1 -mix crosses aborted by the end of the first. year; by cone maturity abortion reached 75 and 69%, respectively. Number of filled seeds per cone varied between female parent genotypes and some cones had no filled seeds. The S l self-pollinations yielded less than half as many filled seeds per cone as the S1 l x S1 -mix crosses and S 1 open pollinations. Germination of filled seed was generally high regardless of degree of inbreeding. Inbreeding depression in seedling height of the S 2 progenies averaged 15% after 10 weeks. The results indicate that jack pine is largely self-compatible even in the second selfed generation. A strong correlation between S 2 and S 1 x S 1 -mix progenies in seedling height together with wide within and among progeny variation indicates that selection for growth in inbred lines will be possible for improvement breeding in jack pine.


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Author(s): Thomas D. Rudolph

Publication: Tree Improvement and Genetics - Central States Forest Tree Improvement Conference - 1976