Genetic analysis of Corynespora leaf fall disease resistance in hevea rubber
2004
Hanantohadi | Hartana, A.((Balai Penelitian Getas, Salatiga (Indonesia))) | Sinaga, M.S.
Corynespora leaf fall disease (CLFD) caused by Corynespora cassiicota fungus is one of the most important disease of hevea rubber in Indonesia. The fungus infects rubber leaves of all ages of susceptible clones all year long irrespective of weather conditions. Chemical treatment to control CLFD rubber is not effective. The strategy to control CLFD should be emphasized on the use of resistant plant materials. However, resistant rubber clones to CLFD tend to be broken by new virulent strains of the fungus. Therefore, the breeding program of hevea rubber for CLFD resistance has to be directed to create new rubber clones carrying durable resistance character. The objective of the research was to study genetic inheritance of the resistance character of hevea rubber to CLFD. F1/2 population, generated from F1/2 rubber clones of PR 255, PR 303, PB 260, RRIC 100, and RRIM 712, were analyzed at Balai Penelitian Karet Getas, Salatiga. The result indicated that resistance character of rubber to CLFD was controlled by two major genes. Genotypic model for the resistance traits were A-B-, e.i. AABB, AABb, AaBB and AaBb, the moderate genotype were AAbb and Aabb, and the susceptible one were aa-, e.i. aaBB, aaBb or aabb. Recessive forms of A gen suppressed the expression of the second gene B/b.
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