Person:
Sudhir Navathe

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Sudhir Navathe
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Sudhir Navathe
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0000-0002-8040-5563

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2018 - 201922020 - 20244
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Now showing 1 - 6 of 6
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    Novel resistance loci for quantitative resistance to Septoria tritici blotch in Asian wheat (Triticum aestivum) via genome-wide association study
    (BioMed Central Ltd, 2024) Patial, M.; Sudhir Navathe; Xinyao He; Kamble, U.; Kumar, M.; Joshi, A.K.; Singh, P.K.
    Publication
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    Genome-wide association mapping for field spot blotch resistance in South Asian spring wheat genotypes
    (John Wiley & Sons Inc., 2024) Kamble, U.; Xinyao He; Sudhir Navathe; Kumar, M.; Patial, M.; Kabir, M.R.; Gyanendra Singh; Singh, G.P.; Joshi, A.K.; Singh, P.K.
    Publication
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    Assessment of Indian wheat germplasm for Septoria nodorum blotch and tan spot reveals new QTLs conferring resistance along with recessive alleles of Tsn1 and Snn3
    (Frontiers Media S.A., 2023) Sudhir Navathe; Xinyao He; Kamble, U.; Kumar, M.; Patial, M.; Gyanendra Singh; Singh, G.P.; Joshi, A.K.; Singh, P.K.
    Publication
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    New genomic regions identified for resistance to spot blotch and terminal heat stress in an interspecific population of triticum aestivum and T. spelta
    (MDPI, 2022) Sudhir Navathe; Pandey, A.K.; Sandeep Sharma; Chand, R.; Mishra, V.K.; Kumar, D.; Jaiswal, S.K.; Mir Asif Iquebal; Velu, G.; Joshi, A.K.; Singh, P.K.
    Publication
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    Hydrogen peroxide prompted lignification affects pathogenicity of hemi-biotrophic pathogen Bipolaris sorokiniana to wheat
    (Korean Society of Plant Pathology, 2019) Poudel, A.; Sudhir Navathe; Chand, R.; Mishra, V.K.; Singh, P.K.; Joshi, A.K.
    Spot blotch caused by Bipolaris sorokiniana has spread to more than 9 million ha of wheat in the warm, humid areas of the Eastern Gangetic Plains (EGP) of South Asia and is a disease of major concern in other similar wheat growing regions worldwide. Differential lignin content in resistant and susceptible genotypes and its association with free radicals such as hydrogen peroxide (H2O2), superoxide (O2−) and hydroxyl radical (OH−) were studied after inoculation under field conditions for two consecutive years. H2O2 significantly influenced lignin content in flag leaves, whereas there was a negative correlation among lignin and H2O2 to the Area Under Disease Progress Curve (AUDPC). The production of H2O2 was higher in the resistant genotypes than susceptible ones. The O2− and OH− positively correlated with AUDPC but negatively with lignin content. This study illustrates that H2O2 has a vital role in prompting lignification and thereby resistance to spot blotch in wheat. We used cluster analysis to separate the resistant and susceptible genotypes by phenotypic and biochemical traits. H2O2 associated lignin production significantly reduced the number of appressoria and penetration pegs. We visualized the effect of lignin in disease resistance using differential histochemical staining of tissue from resistant and susceptible genotypes, which shows the variable accumulation of hydrogen peroxide and lignin around penetration sites.
    Publication
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    Natural variation in elicitation of defense-signaling associates to field resistance against the spot blotch disease in bread wheat (Triticum aestivum L.)
    (Frontiers, 2018) Sharma, S.; Ranabir Sahu; Sudhir Navathe; Mishra, V.K.; Chand, R.; Singh, P.K.; Joshi, A.K.; Pandey, S.P.
    Spot blotch, caused by the hemibiotropic fungus Bipolaris sorokiniana, is amongst the most damaging diseases of wheat. Still, natural variation in expression of biochemical traits that determine field resistance to spot blotch in wheat remain unaddressed. To understand how genotypic variations relate to metabolite profiles of the components of defense-signaling and the plant performance, as well as to discover novel sources of resistance against spot blotch, we have conducted field studies using 968 wheat genotypes at 5 geographical locations in South-Asia in 2 years. 46 genotypes were identified as resistant. Further, in independent confirmatory trials in subsequent 3 years, over 5 geographical locations, we re-characterized 55 genotypes for their resistance (above 46 along with Yangmai#6, a well characterized resistant genotype, and eight susceptible genotypes). We next determined time-dependent spot blotch-induced metabolite profiles of components of defense-signaling as well as levels of enzymatic components of defense pathway (such as salicylic acid (SA), phenolic acids, and redox components), and derived co-variation patterns with respect to resistance in these 55 genotypes. Spot blotch-induced SA accumulation was negatively correlated to disease progression. Amongst phenolic acids, syringic acid was most strongly inversely correlated to disease progression, indicating a defensive function, which was independently confirmed. Thus, exploring natural variation proved extremely useful in determining traits influencing phenotypic plasticity and adaptation to complex environments. Further, by overcoming environmental heterogeneity, our study identifies germplasmand biochemical traits that are deployable for spot blotch resistance in wheat along South-Asia.
    Publication