RESEARCH ON HYBRIDS BETWEEN PICEA ABIES L. AND PICEA ABIES F. PENDULA FOR ENHANCED SPRUCE STAND PRODUCTIVITY, QUALITY AND STABILITY
2002
Parnuta Gh.
Four selected parents from each of two pendula and normal - crowned Picea abies L. were used to separate complete diallel mating designs. The research was upon hybrids between narrow - crowned and normal crowned spruce trees and reciprocal one performed to asses at age 7: the genetic variance of traits; importance of GCA and SCA, effects; heterosis of traits. The potted families were arranged in a randomized complete block design with 4 replications and 10 seedlings per plot, in 5 experimental trials. Six traits were measured, such as: total height (TH), yearly increment of height (YIH); number of branches whorl (NBW), length of leader branches (LLB); forking % (F); survival % (S). Computer analysis, using Schaffer and Usanis (1969) DIALL programme produced the results presented below. Genetic variability of spruce hybrids tested in multisited experimental trials is higher and it occurs under different forms both in the first and the second year from planting, according to the site conditions where the experiments are made. It may noticed the existance of an additive genetic control of the traits in both spruce hybrids, making possible the selection of valuable parent to be used in spruce breading programme. Was estimated both high and mid parent heterosis in pendula x normal crowned spruce hybrid and reciprocal one. Estimates of general (G C A ) and specific (S C A ) combining ability effects to permet the clasification of the best genitors and specific crosses wich will be used in the spruce breeding programme.
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