Noor Khomsah Kartikawati, Prastyono Prastyono, Anto Rimbawanto


Realized genetic gain of improved seed of cajuput from a breeding program and seed source x site interaction on the oil properties (1,8-cineole and oil yield) was evaluated through the establishment of genetic gain trials in two sites: Gunungkidul dan Ponorogo. Improved seed from two seed sources tested in the trials were first generation seedling seed orchard (SSO-1) and selected superior seed trees in the SSO-1 (SSO-2). As a control, unimproved seed from three seed sources: natural stands in Maluku (ST-1), plantation in Ponorogo (ST-2) and Gundih (ST-3) were also planted together in the trials. The genetic gain trial was established using a randomised complete clock design which consists of 5 tested seed sources, 20 treeplot, 8 replicates and spacing of 3 x 3m. The results of study showed that the realized genetic gain for the content of 1,8-cineole from SSO-2 over the controls ranged from 13.78% to 17.52% and the genetic gain of the oil yield ranged from 15.76% to 26,43%. Meanwhile the realized genetic gain for SSO-1 ranged from 2.07% to 5.42% and 10.15% to 20.30% for the content of 1,8-cineole and oil yield,respectively. The non-significance of seed source x site interaction indicates that all improved seed from the first-generation seedling seed orchard of cajuput in Paliyan are most likely to be adaptable to the varies site in Gunungkidul and Ponorogo while maintaining the high productivity in oil properties.


genetic gain trial; tree improvement; seedling seed orchard; oil properties

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