Genotype-environment interaction and phenotypic stability for girth growth and rubber yield of Hevea clones in São Paulo State, Brazil
Genet. mol. biol
;
26(4): 441-448, dec. 2003. ilus, tab, graf
Article
in English
| LILACS
| ID: lil-355289
RESUMO
The best-yielding, best vigour and most stable Hevea clones are identified by growing clones in different environments. However, research on the stability in Hevea brasiliensis (Willd. Adr. ex Juss.) Muell.-Arg. is scarce. The objectives of this work were to assess genotype-environment interaction and determine stable genotypes. Stability analysis were performed on results for girth growth and rubber yield of seven clones from five comparative trials conducted over 10 years (girth growth) and four years (rubber yield) in São Paulo State, Brazil. Stability was estimated using the Eberhart and Russell (1966) method. Year by location and location variability were the dominant sources of interactions. The stability analysis identified GT 1 and IAN 873 as the most stable clones for girth growth and rubber yield respectively since their regression coefficients were almost the unity (beta = 1) and they had one of the lowest deviations from regressions (S2di). Their coefficient of determination (Rý) was as high as 89.5 percent and 89.8 percent confirming their stability. In contrast, clones such as PB 235, PR 261, and RRIM 701 for girth growth and clones such as GT 1 for rubber yield with regression coefficients greater than one were regarded as sensitive to environment changes.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Rubber
/
Trees
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Genet. mol. biol
Journal subject:
Genetics
Year:
2003
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
APTA - Instituto Agronômico/BR
/
APTA - Regional do Centro Norte/BR
/
APTA - Regional do Nordeste Paulista/BR
/
APTA - Regional do Noroeste Paulista/BR
/
UCDB Programa Desenvolvimento Local/BR
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