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Susceptibility to Heterobasidion parviporum in Picea abies clones grown in different environments
Author(s) -
Karlsson B.,
Tsopelas P.,
Zamponi L.,
Capretti P.,
Soulioti N.,
Swedjemark G.
Publication year - 2008
Publication title -
forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 1437-4781
DOI - 10.1111/j.1439-0329.2008.00543.x
Subject(s) - biology , cutting , heritability , picea abies , inoculation , tree breeding , seedling , horticulture , botany , host (biology) , genetic variation , genotype , woody plant , ecology , gene , biochemistry , genetics
Summary Thirty‐five Norway spruce, Picea abies , clones from Sweden were tested for resistance to Heterobasidion parviporum . Rooted cuttings of the clones were planted in Italy and Greece and cultivated for two growing seasons before inoculation with H. parviporum. Extent of infection was determined 6 weeks later. The results were compared to those of earlier inoculations in Sweden. Plant growth traits were under strong genetic control in all locations with broad sense heritability estimates between 0.14 and 0.54. Lesion and fungal extension heritabilities were moderate, H 2 ranged from 0.09 to 0.20, and exhibited rather large genetic variation. There was significant genotypic correlation between Italy and Greece with respect to both lesions and fungal extension. No such correlations were found between Sweden and the two other countries. The lack of repeatability in testing susceptibility is unsatisfactory. It could be explained by C‐effects associated with propagation of the host plants. Height growth correlated significantly and positively among all countries.