Peroxidase Isozyme Pattern in Pearl Millet Lines Resistant and Susceptible to Downy Mildew

Abstract

Peroxidase isozyme patterns of five downy (DM) resistant'inbred lines (PIB-57-1, PIB-124g, PIB-1356, PIB-1364 and PIB-1440), five susceptible lines (PIB-1335-1-1, PIB-1314-2-2, PIB-2231-1, 7042 and PIB-1530-1-1) and DM free plants from the susceptible lines of pearl millet were studied. The results suggested a possible involvement of an isoperoxidase (C9) m imparting the resistance. The in\-olvement of t-R-o other isozymes (C5 and C6) was also indicated in the resistance mechanism. The specific differentiation m particular isozyme pattern can be a useful criterion for characterization ol resistance to downy mildew.