| Summary: | Pinus merkusii is a resin producing tree which has been cultivated by
Perum Perhutani (State owned enterprise managing State Forests) as non-timber
forest product. The research aimed to assess genetic variations, estimated
heritability, genetic gain in resin yield, genetic and phenotypic correlations
between resin yield and growth of P. merkusii as well genetic and environment
interaction.
The study was conducted on half-sib progeny test of 7-year-old P.
merkusii plantation, using randomized complete block design by sub-line system
(sub-line SSO Jember and Sulawesi). Variables measured were diameter, height
and average of resin yield from two drillings using 13 mm drill bit at 100 cm
height from the ground.
There is resin genetic variation among families on SSO Jember and
Sulawesi sub-line, thus, there is opportunity for selection to obtain genetic
improvement. Resin estimated value of individual heritability (h
2
i) was
categorized medium and family heritability (h
2
f) was categorized low, both in
SSO Jember and Sulawesi sub-line, which indicated resin production is influenced
by genetic and environmental factors. The highest genetic resin production was
obtained by combination selecting family and within family in order to increase
the production by 11.6 % and 8.1 % in SSO Jember and Sulawesi sub-line.
Phenotypic correlation between resin and growth was positive, eventhough it was
relatively low. Genetic correlation between resin with diameter in SSO Jember
and Sulawesi sub-line were (-0.75) and (-0.95) indicating the increase of resin
production is accompanied by the decrease of diameter, while the correlation
between resin with tree height were 0.19 and 0 which showed there is no
correlation between them. In SSO Jember sub-line, there was an absence
interaction between genotype and environment which indicate relatively stable
families. Meanwhile, in Sulawesi sub-line, interaction between genotype and
environment existed that indicated not all families are stable.
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