Simarjit KaurGurinder Pal Singh2019-07-102019-07-102019http://krishikosh.egranth.ac.in/handle/1/5810113515The present study was carried out at research farm, Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, Punjab to study inheritance of stripe rust, leaf rust and spot blotch diseases of barley (Hordeum vulgare L.) in hulless barley genotype PL891, which was found resistant to these foliar diseases since last three years. Chi-square analysis was used to study the number of resistance genes for stripe rust pathotypes; G, M and 24, leaf rust pathotypes; H1, H4 and H5 and spot blotch resistance in PL891. Genetic analysis of F2 generation of PL891 X Jyoti revealed single dominant gene (3 resistant: 1 susceptible) for stripe rust pathotype M and 24 while for pathotype G, F2 showed inhibitory gene action (13 resistant: 3 susceptible). For leaf rust pathotypes H1 and H4, F2 population of PL891 X Jyoti segregated for two independent dominant genes showing duplicate gene action (15 resistant : 1 susceptible) while for pathotype H5, F2 population segregated for inhibitory gene action. Resistance to spot blotch in line PL891 was found to be controlled by single recessive gene. The inheritance studies for these three foliar diseases will be helpful in further gene mapping and transfer of resistance genes into other elite barley cultivars which have become susceptible to these diseases.ennullThesis