Phenotypic Screening of F4 Breeding Lines against Bacterial Blight Disease in Rice
K. Alekya *
Agricultural College, Jagtial, India.
B. Laxmi Prasanna
Department of Plant Breeding, Rice Research Scheme, Regional Agricultural Research Station, Jagtial, India.
M. Balram
Department of Genetics and Plant Breeding, Agricultural College, Warangal, India.
N. Balram
Department of Plant Pathology, Regional Agricultural Research Station, Jagtial, India.
P. Gonya Nayak
Department of Plant Breeding, Rice Research Scheme, Regional Agricultural Research Station, Jagtial, India.
B. Srinivas
Department of Plant Breeding, Rice Research Scheme, Regional Agricultural Research Station, Jagtial, India.
P. Madhukar
Department of Plant Breeding, Rice Research Scheme, Regional Agricultural Research Station, Jagtial, India.
*Author to whom correspondence should be addressed.
Abstract
Biotic stresses are major threat to rice production. Among biotic stresses, bacterial leaf blight is one of the major diseases affecting rice grain production in rice growing areas. Present investigation was conducted to evaluate phenotypic effect of 50 breeding lines from a cross (Pranahitha//ISM/MTU1010) in glass house at Regional Agricultural Research Station, Jagtial by inoculating Bacterial leaf blight culture (DX-020) by leaf clipping method. Out of these 50 F4 lines evaluated, twenty nine breeding lines showed resistant reaction with disease score of 1. Eleven lines showed moderately resistant reaction with disease score 3. Twenty nine breeding lines that were resistant with disease score 1, had excellent grain yield. Hence, these lines can be advanced to further generations. Thus the present study has demonstrated that phenotypic selection is successful in the glass house and these breeding lines with higher yield levels are expected to perform better in the field trials and further in the farmers fields with the good level of bacterial blight resistance.
Keywords: Rice, bacterial blight, leaf clipping method and phenotypic screening.