EVALUATION OF SOME RICE GENOTYPES FOR RESISTANCE TO BACTERIAL BLIGHT, XANTHOMONAS ORYZAE PV ORY.ZAE

Abstract

Rice germplasm comprising some Indian and exotic cultivars, donors for 'bacterial
blight resistance' in the Indian rice breeding programme and some scented
primitive rice cultivars, were evaluated for reaction to five genetically characterized
isolates of Xanthomonas oryzae pv. oryzae. All these cultivars could be classified
into 13 diverse groups on the basis of their reaction spectra. BR 285-5-6-6-2,
lET 8320, lET 8326, lET 8584, lET 9691, lET 10745, lET 11005, lET 12188,
IR 32720-139- 2-1-1-2, PERH 2 and PR 110 were resistant to all the five
isolates. Out of the scentedibasmatJ type landraces of rice, X"ang Geng Cao
was resistant to all the five isolates; eight others namely Kamal Local, Basmati
1, Basmati 372, Basmati 376, Basmati 397 Basmati C-622, Basmati 5888 and
BasmatJ SUfald were resistant to only two weekly virulent isolates. Resistanoe
to bacterial blight for the scentecllbasmatl type rices should be sought in
Iandraces or transferred from non-scented rices.