The Bioscan, 2 (4): 263-268,2007
An International Quarterly Journal of Life Sciences
web site: www.thebioscan.in 
STUDIES ON GENETIC ANALYSIS OF INHERITANCE OF RESISTANCE TO 
BACTERIAL LEAF BLIGHT IN RICE
M. NAGARAJU**, HASEENA RAFATH*** AND P. A. KHAN* 
**Division of Plant Breeding, Central Rice Research Institute, Cuttack - 753 006, INDIA
***Department of Botany, Annamalai University, Annamalai Nagar - 608 002, Tammil Nadu
Department of Botany , Berhampur University, Berhampur - 760 007, Orissa, INDIA

KEY WORDS

Oryza sativa L. 
Bacterial leaf blight
Susceptible
Resistance Xanthomonas compestris pv.oryzae
Received on: 13.03.2007 Accepted on: 27.06.2007 *Corresponding Author

ABSTRACT

Genetic analysis of inheritance of bacterial leaf blight (BLB), a bacterial disease in rice caused by Xanthomonas compestris pv. oryzae was studied in a cross between a Japonica rice, jukkoku (susceptible to BLB), and one indica rice Bhogzira 1 (BJ.1) resistant to BLB using the bacterial isolate Xo4. Clipping method of inoculation was adapted and degree of resistance to BLB was measured on the basis of lesion length. The segregation pattern of disease resistance was followed up to F6 generation in a progeny testing programme. Well known and widely used models of Hayman’s (1954) diallel analysis and Griffing’s (1956) combining ability analysis have been utilized to understand the gene action for resistance. The inheritance of resistance to bacterial leaf blight is polygenic and effective selection of progenies has to be made over several generations to achieve a homozygous resistance. It is felt that several short and stiff strawed lines with a dwarf gene source from jukkoku and a high degree of resistance to bacterial blight from resistant indica rice could be obtained.