Juvenile Blister Rust Resistance and Height Growth of Pinus strobus x P. peuce F1 Hybrids

1989

S. 45-49

2 Abb., 6 Tab., 29 Lit. Ang.

Unselbständiges Werk

200051064

Twenty-one P. strobus x P. peuce full-sib and two half-sib families were artificially inoculated with C. ribicola. The families were arranged in a randomized complete-block design. Each family was represented by a 10- seedling plot in each of 3 blocks. The results after 5 years of testing are, as follows: (1) differences both among parents and hybrids were significant for resistance and growth; (2) the hybrid's performances in resistance and growth were intermediate between the 2 parents' performances; (3) GCA variance for resistance is 7 times larger than the SCA one, suggesting that the additive variance is most important in the parent populations; (4) concerning growth, the GCA: SCA variance ratio was 1:1; (5) resistance and growth narrow-sense heritabilities were 0.521 and 0.408 respectively; (6) expected genetic gain for resistance and growth would be 26%, 20%, 11% and 4% and 7%, 5%, 3% and 1% respectively if the best 3, 6, 12 and 18 families were selected; (7) there were good general combiners among the parents.