Record Details

Deciphering Genotype-By-Environment Interaction for Target Environmental Delineation and Identification of Stable Resistant Sources Against Foliar Blast Disease of Pearl Millet

OAR@ICRISAT

View Archive Info
 
 
Field Value
 
Relation http://oar.icrisat.org/11861/
https://doi.org/10.3389/fpls.2021.656158
doi:10.3389/fpls.2021.656158
 
Title Deciphering Genotype-By-Environment Interaction for Target Environmental Delineation and Identification of Stable Resistant Sources Against Foliar Blast Disease of Pearl Millet
 
Creator Sankar, S M
Singh, S P
Prakash, G
Satyavathi, C T
Soumya, S L
Yadav, Y
Sharma, L D
Rao, A R
Singh, N
Srivastava, R K
 
Subject Pearl Millet
Plant Disease
 
Description Once thought to be a minor disease, foliar blast disease of pearl millet, caused by
Magnaporthe grisea, has recently emerged as an important biotic constraint for pearl
millet production in India. The presence of a wider host range as well as high pathogenic
heterogeneity complicates host–pathogen dynamics. Furthermore, environmental
factors play a significant role in exacerbating the disease severity. An attempt was made
to unravel the genotype-by-environment interactions for identification and validation of
stable resistant genotypes against foliar blast disease through multi-environment testing.
A diversity panel consisting of 250 accessions collected from over 20 different countries
was screened under natural epiphytotic conditions in five environments. A total of 43
resistant genotypes were found to have high and stable resistance. Interestingly, most
of the resistant lines were late maturing. Combined ANOVA of these 250 genotypes
exhibited significant genotype-by-environment interaction and indicated the involvement
of crossover interaction with a consistent genotypic response. This justifies the necessity
of multi-year and multi-location testing. The first two principal components (PCs)
accounted for 44.85 and 29.22% of the total variance in the environment-centered
blast scoring results. Heritability-adjusted genotype plus genotype x environment
interaction (HA-GGE) biplot aptly identified “IP 11353” and “IP 22423, IP 7910 and
IP 7941” as “ideal” and “desirable” genotypes, respectively, having stable resistance
and genetic buffering capacity against this disease. Bootstrapping at a 95% confidence
interval validated the recommendations of genotypes. Therefore, these genotypes can
be used in future resistance breeding programs in pearl millet. Mega-environment
delineation and desirability index suggested Jaipur as the ideal environment for precise testing of material against the disease and will increase proper resource optimization in
future breeding programs. Information obtained in current study will be further used for
genome-wide association mapping of foliar blast disease in pearl millet.
 
Publisher Frontiers Media
 
Date 2021-05
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://oar.icrisat.org/11861/1/fpls-12-656158.pdf
Sankar, S M and Singh, S P and Prakash, G and Satyavathi, C T and Soumya, S L and Yadav, Y and Sharma, L D and Rao, A R and Singh, N and Srivastava, R K (2021) Deciphering Genotype-By-Environment Interaction for Target Environmental Delineation and Identification of Stable Resistant Sources Against Foliar Blast Disease of Pearl Millet. Frontiers in Plant Science (TSI), 12 (656158). pp. 1-18. ISSN 1664-462X