Inheritance studies of stripe rust, leaf rust and spot blotch diseases in barley (Hordeum vulgare L.)
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Date
2019
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Punjab Agricultural University, Ludhiana
Abstract
The 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.
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