Korelasi ketahanan padi gogo dengan kandungan senyawa fenol pada daun dan malai terserang blas (Pyricularia oryzae Cav.).
1989
Yanuar Y.
This study was conducted under greenhouse conditions between June, 1987 and January, 1988, at Bogor Research Institute for Food Crops, BORIF. A factorial design with 4 replications was used. Three upland rice cultivars, i.e. Ranau, Sirandah, and Sentani, and 2 different isolates of P. oryzae, i.e. No. 24 and No. 26 were utilized. Blast disease intensity, number of lesion for leaf, and type and concentration of phenolic compounds in leaves and panicle necks decreased as the rice plant reached maturity. Based on disease intensity, it was found that Ranau was the most resistant cultivar to leaf blast. On the other hand, Sentani was the most resistant to neck blast. Chromatographic analysis indicated that the presence of phenolic compounds was very high in leaves of Ranau. No phenolic compounds were found in necks of panicles. Pathogenicity test showed that the isolates No. 24 induced the formation of phenolic compounds whereas isolate No. 26 apparently increased their concentration especialy in Ranau and Sentani cultivars. It seems that resistance to leaf blast disease is in close relationship with the concentration of phenolic compounds. Greater the concentration of phenolic compounds in the leaves higher the resistance to blast disease.
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