Adaptability, stability, productivity and genetic parameters in slash pine second-generation families in early age

Abstract

The study was conducted to estimate the stability, adaptability, productivity and genetic parameters in Slash pine second-generation half-sib families, considering phenotypic traits in early age. Forty-four families from a first generation seed orchard in Colombo-PR, Brazil, were used in this study. Two progenies tests were established in a randomized complete block design. The first test was implemented in March 2009 in Ribeirão Branco, São Paulo state, containing 40 blocks, one tree per plot, 44 treatments (progenies) and 6 controls. Another test was implemented in Ponta Grossa, Paraná state, using the same experimental design and number of plants per plot, and with 24 treatments, 32 blocks. The growth traits evaluated were total height, diameter at breast height (dbh) and wood volume, within five years. The form traits evaluated were stem form, branch thickness, branch angle, number of branches, fork and fox tail five years after planting. Deviance analysis and estimates of stability, adaptability, productivity and genetic parameters were performed using the methods of best linear unbiased predictor (BLUP) and residual maximum likelihood (REML). There was significant variation among progenies for growth and form traits. Considerable genetic variation was detected mainly for wood volume. High coefficients of genetic variation and heritability showed low environmental influence on phenotypic variation, which is important for the prediction of genetic gain by selection. Crosses between different progenies individuals groups will be prioritized for obtaining heterotics genotypes and increase the probability of obtaining high specific combining ability.

Genotype-by-environment interactions and the dynamic relationship between tree vitality and height in northern Pinus sylvestris

“…The magnitude of the c CV A also agrees with the literature for Scots pine, where that reported for height varies between 5 and 25% (Haapanen 2001), 8-9% (Kroon et al 2011), 3.1-16.3% (Persson andAndersson 2003), 5.52% (Fries 2012), or 4.36% (Hong et al 2014). Similar values have been reported for other species, such as 5-8.8% in Pinus radiata (Baltunis and Brawner 2010) or 3.3% in Pinus elliottii Engelm (Pagliarini et al 2016).…”