Juvenile Genetic Parameters and Genotypic Stability of Pinus pinaster Ait. Open-Pollinated Families under Different Water and Nutrient Regimes
Authors: Zas, Rafael1; Fernández-López, Josefa2
Source: Forest Science, Volume 51, Number 2, April 2005 , pp. 165-174(10)
Abstract:
The purpose of this study was to estimate the impact of genotype × nutrient and genotype × water availability interactions in the maritime pine (Pinus pinaster Ait.) breeding program in Galicia (northwestern Spain). Twenty-nine open-pollinated families, randomly selected in a seed orchard, were cultivated for 23 weeks in a greenhouse in a split-plot design under controlled conditions. Two water regimes (high and low water supply) combined with two nutrient regimes (high and low nutrient supply) were applied by subirrigation. Both the irrigation and the fertilization treatments had a strong effect in all the assessed traits. Heritabilities for growth and biomass traits were moderate to high (0.2–0.5) in individual treatments, especially in those treatments that led to intermediate growth. However, when analyzing all treatments together, the impact of the family × treatment interactions led to an important reduction (0.1–0.2) of the heritability estimates. The results indicated that the genotype × water and genotype × nutrient interactions may be important and could not be ignored in the Galician maritime pine breeding program. However, the study of the family ecovalence values indicated that interactions are mainly due to some interactive families (7 to 31% of families). Culling several of the female parents with high ecovalence values would result in a stable breeding population and would be enough to overcome the interaction handicap in the breeding program. FOR. SCI. 51(2):165–174.Keywords: Early selection; half-sibs; genotype × environment interaction; drought; fertilization; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resources; natural resource management
Document Type: Regular article
Affiliations: 1: Dpto. Producción Forestal Centro de Investigacións Forestais e Ambientais de Lourizán Apdo. 127 Pontevedra Spain 36080 Phone: +34-986-805067;, Fax: +34-986-856420, Email: rzas.cifal@siam-cma.org 2: Phone: +34-986-805002, Email: ffina.cifal@siam-cma.org
