Genetic Variation in Blister Rust Resistance and Growth Traits in Pinus strobus H P. peuce Hybrid at Age 17 (Experiment 1)

2000

S. 109-120

2 Abb., 9 Tab., 34 Lit. Ang.

Unselbständiges Werk

200069747

A 7 x 4 factorial crossing was performed between Pinus strobus (female) and P. peuce (male) to combine the rapid growth of P. strobus with high resistance of P. peuce to blister-rust. The resulting 28 families were artifically inocultaed at age two and planted in the field at age 6. Nine traits were measured at age 17. The results indicated that: (1) the effects of female parents were highly significant for growth traits and blister-rust resistance, whereas the male parents had highly significant effects only on growth traits; (2) the hybrid performance was intermediate between the two parent species, in all traits; (3) highly significant positive correlations were found among growth traits, but no significant correlations were found between any growth trait and blister-rust resistance; (4) good general combiners, not only for growth but for blister-rust resistance, too, were found among eastern white pine parents as three of 11 parents had positive significant gca effects for blister-rust resistance and five for volume growth; and (5) a genetic gain of 9.5 % in blister-rust resistance and 18.3 % in volume growth could be achieved.