Naslov
Procjena genetske dobiti u testu polusrodnika hrasta lužnjaka (Quercus robur L.)
(Estimation of genetic gain in a progeny trial of pedunculate oak(Quercus robur L.))

Autori
Vidaković, Mirko ; Kajba, Davorin ; Bogdan, Saša ; Podnar, Vlatko ; Bećarević, Josip

Izvornik
Glasnik za šumske pokuse (0352-3861) 37 (2000); 375-381

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Quercus robur; test polusrodnika; genetski parametri
(Quercus robur; progeny trial; genetic parameters)

Sažetak
The study presents evaluation of an open-pollinated progeny test of 21 selected plus trees from Slavonian pedunculate oak provenance in Croatia (in the central part of Drava river valley). The test was established in 1992 with two-year-old seedlings. Heights were measured at 5 to 9 years. The estimation of genetic parameters (heritability and genetic gain) was made for in total 21 half sib progenies, as well as separately for half sib progenies from each population (eight from the Donji Miholjac population and thirteen from the Slatina population). By the phenotypical selection of pedunculate oak plus trees and by the progeny trial the genetic gain for the height increment can be achieved, inside the investigated central Drava River seed region, as well as in the half sib progenies from particular populations. The achieved genetic gain at the orchard age from two to seven years was lower than the expected one due to the decreased selection differential in the old pedunculate oak stands. Estimates of heritability values (h2) were increased with the orchard age, and in the tested half sib progenies these values ranged from 0, 74 to 0, 87, that suggests this trait to be under a high genetic control level. The statistically significant differences were obtained also for total heights between half-sib progenies inside the investigated populations and the seed region, that indicates the existence of a very marked genetic differentiation in the pedunculate oak populations. By increasing the selection intensity on the basis of mother GCA abilities, it is possible to achieve an additional genetic gain, taking care however of the stability of future pedunculate oak plantations.

Izvorni jezik
Engleski

Znanstvena područja
Šumarstvo

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