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Inheritance and allelic relationship among gene(s) for blast resistance in pearl millet [ Pennisetum glaucum (L.) R. Br.]
Author(s) -
Singh Shweta,
Sharma Rajan,
Pushpavathi Bheemavarapu,
Gupta Shashi Kumar,
Durgarani Ch. V.,
Raj Chandramani
Publication year - 2018
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/pbr.12607
Subject(s) - pennisetum , biology , backcrossing , diallel cross , genotype , allele , magnaporthe grisea , genetics , gene , plant disease resistance , horticulture , botany , oryza sativa , hybrid
Six blast‐resistant pearl millet genotypes, ICMB 93333, ICMB 97222, ICMR 06444, ICMR 06222, ICMR 11003 and IP 21187‐P1, were crossed with two susceptible genotypes, ICMB 95444 and ICMB 89111 to generate F 1 s, F 2 s and backcrosses, BC 1 P 1 (susceptible parent × F 1 ) and BC 1 P 2 (resistant parent × F 1 ) for inheritance study. The resistant genotypes were crossed among themselves in half diallel to generate F 1 s and F 2 s for test of allelism. The F 1 , F 2 and backcross generations, and their parents were screened in a glasshouse against Magnaporthe grisea isolates Pg 45 and Pg 53. The reaction of the F 1 s, segregation pattern of F 2 s and BC 1 P 1 derived from crosses involving two susceptible parents and six resistant parents revealed the presence of single dominant gene governing resistance in the resistant genotypes. No segregation for blast reaction was observed in the F 2 s derived from the crosses of resistant × resistant parents. The resistance reaction of these F 2 s indicated that single dominant gene conferring resistance in the six genotypes is allelic, that is same gene imparts blast resistance in these genotypes to M. grisea isolates.