Genetic Variability Inresistance of Falcatariamoluccana (Miq.) Barneby & J. W. Grimes to Gall Rust Disease

ABSTRACT. During 2003-2009 large area plantations of F. Moluccana, in Java particularly, had been attacked severely by gall rust disease. In order to reduce the gall rust impacts, selection of gall-rust resistance of F. moluccananeeds to be undertaken. Therefore, study of genetic variability on gall-rust resistance of F. moluccanawas carried out at the 3 years old of gall rust disease resistance trial located at Kediri, East Java. The trial consists of 80open pollinated families, including four seed sources from Kediri (East Java), Lombok (Nusa Tenggara), Papua and Candiroto (Central Java). In this study, several variables were assessed i.e. height, diameter, stem form, crown density, number of galls which existed on stems, branches, twigs, and crowns. The disease incidence and severity were calculated using the index scores of gall rust. Results revealedthat there were significant differences in stem-form and stem-galls between families. Individual heritability (h2i) was relatively medium for stem-form, branch-galls and stem-galls, whereas h2i for diameter, crown density and twig-galls were low. Genetic correlations were strongly positive between diameter and the disease. Meanwhile, a correlation between stem-form and the diseases was strongly negative.Therefore, individual heritability for stem-form could be used to decrease disease incidence and severity. Index of disease incidence and severity varied significantly between 80 families in the trial. Grouping of the families based on the seed sources (provenances) showed that Papua seed sources exhibited the most resist or tolerate to the gall rust diseases.Therefore, further attention to the potential provenances involving the disease severity and incidence need to be paid.

Keywords: Falcatariamoluccana, gall rust diseases, resistance, seed sources

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Judul Seri

Journal of Forestry Research

No. Panggil

//

Penerbit

: ., 2012

Deskripsi Fisik

1-9

Bahasa

English

ISBN/ISSN

0216-0919

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//

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