Genotype-environment interaction in Latvian Scots pine growth and quality traits and its impact on progeny testing

Jansons, A., Latvia Univ. of Agriculture, Jelgava

Genotype-environment interaction in Latvian Scots pine growth and quality traits and its impact on progeny testing

2008

Jansons, A., Latvia Univ. of Agriculture, Jelgava (Latvia)

Progeny testing of Scots pine in Latvia is carried out in only few locations, however, material from selections via seed orchards is deployed in various climatic and soil conditions, therefore concerns arise for influence of genotype environment interaction on levels of genetic gain. Problem is addressed based on 3 open pollinated progeny tests, consisting of 80 open pollinated families, located in 3 distant climatic regions in Latvia. Test age is 27 years, therefore not only growth, but also branch quality traits can be reliably analyzed. Strong genetic correlation (rb=0.80-0.94) among sites for tree height and diameter was found, but considerably weaker for branch traits like diameter of thickest branch (rb=0.52-0.67), average branch diameter, and sum of branch diameters (rb=0.41-0.49). Coefficients of additive genetic variation and coefficients of phenotypic variation among family means, determining potential of improvement via breeding, can be inflated by up to half, based on single site estimates for growth traits and double for quality traits. Backward selection based on results of several trials, in contrast to forward selection or utilization of single experiment results, could lead to improvement of branch traits close to the same as for growth traits (height and diameter). Single site narrow-sense heritability estimates for analyzed growth and quality traits are up to twice as large as across site estimates, indicating possibilities of serious bias in genetic gain estimates based on results from one test site. Testing at 4-5 sites for further breeding work is recommended.

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Mots clés AGROVOC

altura branche branches climatic factors diameter diametro experimentation facteur climatique genetic correlation genetic inheritance genetic parameters hauteur height heredabilidad heritability latvia letonia lettonie pinus sylvestris progeny testing pruebas de descendencia ramas soil chemicophysical properties

Informations bibliographiques

Publié dans

Research for Rural Development. International Scientific Conference Proceedings (Latvia)

Numéro 14 ISSN 1691-4031

Editeur

LLU

Pagination

p. 128-136

D'autres materias

Correlacion genetica; Heredite; Correlation genetique; Propriete physicochimique du sol; Propiedades fisico - quimicas suelo; Diametre; Heritabilite; Factores climaticos; Experimentacion; Parametre genetique; Epreuve sur la descendance; Herencia genetica; Parametros geneticos

Langue

anglais

Note

Summary (En)

Creator variant: Jansons, Ā.

4 tables, 26 ref.

Type

Conference; Summary

Source

Research for Rural Development 2008. International Scientific Conference Proceedings, Jelgava, Latvia, Gaile, Z. et al..- Jelgava (Latvia): LLU, 2008. International Scientific Conference: Research for Rural Development 2008, 14, Jelgava (Latvia), 21-23 May 2008.- p. 128-136

Conférence

International Scientific Conference: Research for Rural Development 2008, 14, Jelgava (Latvia), 21-23 May 2008

Sur AGRIS depuis: 2009-12-15

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