An investigation into the occurrence and nature of genotype by environment interaction in<i>Pinus patula</i>

Snedden, CL; Verryn, S. D.

doi:10.1080/10295925.1999.9631244

Cited by 1 publication

(3 citation statements)

References 6 publications

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“…This is in agreement with other studies in the region which have reported significant GxE effects for P.patula (Denison, 1973;Falkenhagen, 1979;Barnes et al, 1992;Snedden and Verryn, 1999;Kanzler and Hodge, 2000). The initial use of an ANOVA is useful as it allows the testing of the effects of environment and genotype and gives an indication of any interaction present.…”

Section: Genetic Parameters and Correlations Between Sitessupporting

confidence: 93%

“…Studies with P. taeda in the South-East USA indicate that a fanning response is the major cause for the GxE interaction variance in that region (Li and McKeand, 1989), and this holds significant benefits forthe deployment ofelite material (McKeand et al, 1997) and (Duzan and Williams, 1988). A study in Mpumalanga region (Snedden and Verryn, 1999), suggests some sort of a fanning response amongst P. patula families within that region.…”

Section: Genetic Parameters and Correlations Between Sitesmentioning

confidence: 97%

“…None of these studies, however, attempted to quantify this GxE, or investigate its causes or implications. Amore recentstudy,establishedon 5 sites in the Mpumalanga province ofSouth Africa (Snedden and Verryn, 1999) demonstrated statistically highly significantlevels ofGxE. Moderate genetic correlations between sites of 0.51 to 0.73 were calculated and it was recommended that a single breeding population be established on two sites with the selection intensity low enough to allow selections for specific regions after testing in those regions.…”

Section: Introductionmentioning

confidence: 99%

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Genotype by environment interaction for volume growth at 6 years of age in a series of fivePinus patulaprogeny trials in southern Africa

Kanzler

Hagedorn

Hodge

et al. 2003

The Southern African Forestry Journal

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SYNOPSIS Genotype x environment interaction was investigated in a series of5 Pinus patula progeny trials planted by the Institute for Commercial Forestry Research in southern Africa. The trials were established from Mpumalanga to the North-eastern Cape in a balanced 7x7lattice design with 48 common treatments that comprised 45 unrelated, open-pollinated families and 3 genetic checks. The environments sampled represented a range of climatic and site quality gradients. All trees were assessed for height and diameter at 6 years of age. Survival was 87% and ranged from 83 to 92% across the 5 sites. Growth on the 5 sites varied from 0,034m 3 to 0,065m 3 / tree and single site heritability estimates ranged from 0,17 to 0,43. The interactions between site and treatment were highly significant. The overall GxE variance represented approximately 21% of the variance due to treatment. Estimated Type B genetic correlations averaged 0,76 for all pairs of sites with a range ofO,4 to 1,0 and were correlated with median rainfall during the spring period from September to November. Thejoint regression method was utilised to determine the stability of genotypes across sites. Some rank changes were detected across the 5 locations but these were limited to 15% of the families tested. Results indicate that GxE may be important for Pinus patula within southern Africa and that some form of regionalis ation may be possible using some simple environmental variables such as rainfall.