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Alternaria solani

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A Kamalakannan – One of the best experts on this subject based on the ideXlab platform.

  • Tomato early blight (Alternaria solani): Location and transmission
    Phytopathology, 2020
    Co-Authors: Pr Renganayaki, Shobha Sundareswaran, S P Mohan Kumar, A Kamalakannan
    Abstract:

    Tomato is one of the popular vegetable crops grown in India and Tamilnadu. Early blight is the most important disease of tomato caused by Alternaria solani which is seed borne in nature can reduce the seed germgermination and yield up to 70%. Current study is on the location and transmission of Alternaria solani in tomato seeds. A total of 100 seed samples were collected from seed producers and farmers across Tamilnadu. Seed was extracted from the collected fruits and subjected to various seed health testing methods. Five samples showing higher incidence of seed borne fungi were selected for studying the location and transmission of the pathogen. The results revealed that, Alternaria solani percentage of infection was detected to be higher under Standard Blotter Method (18%). Locality of Alternaria solani ranged up to 35% in seed coat, 48% in cotyledons and 17% in embryonic axis and the field experiments shown 42% seed to seed transmission of the pathogen.

Weidong Chen – One of the best experts on this subject based on the ideXlab platform.

  • Functional Analyses of the Diels-Alderase Gene sol5 of Ascochyta rabiei and Alternaria solani Indicate that the Solanapyrone Phytotoxins Are Not Required for Pathogenicity.
    Molecular plant-microbe interactions : MPMI, 2015
    Co-Authors: Wonyong Kim, Chung-min Park, Jeong-jin Park, Hajime Akamatsu, Tobin L. Peever, Ming Xian, David R. Gang, George J. Vandemark, Weidong Chen
    Abstract:

    Ascochyta rabiei and Alternaria solani, the causal agents of Ascochyta blight of chickpea (Cicer arietinum) and early blight of potato (Solanum tuberosum), respectively, produce a set of phytotoxic compounds including solanapyrones A, B, and C. Although both the phytotoxicity of solanapyrones and their universal production among field isolates have been documented, the role of solanapyrones in pathogenicity is not well understood. Here, we report the functional characterization of the sol5 gene, which encodes a Diels-Alderase that catalyzes the final step of solanapyrone biosynthesis. Deletion of sol5 in both Ascochyta rabiei and Alternaria solani completely prevented production of solanapyrones and led to accumulation of the immediate precursor compound, prosolanapyrone II-diol, which is not toxic to plants. Deletion of sol5 did not negatively affect growth rate or spore production in vitro, and led to overexpression of the other solanapyrone biosynthesis genes, suggesting a possible feedback regulation mechanism. Phytotoxicity tests showed that solanapyrone A is highly toxic to several legume species and Arabidopsis thaliana. Despite the apparent phytotoxicity of solanapyrone A, pathogenicity tests showed that solanapyrone-minus mutants of Ascochyta rabiei and Alternaria solani were equally virulent as their corresponding wild-type progenitors, suggesting that solanapyrones are not required for pathogenicity.

Pr Renganayaki – One of the best experts on this subject based on the ideXlab platform.

  • Tomato early blight (Alternaria solani): Location and transmission
    Phytopathology, 2020
    Co-Authors: Pr Renganayaki, Shobha Sundareswaran, S P Mohan Kumar, A Kamalakannan
    Abstract:

    Tomato is one of the popular vegetable crops grown in India and Tamilnadu. Early blight is the most important disease of tomato caused by Alternaria solani which is seed borne in nature can reduce the seed germination and yield up to 70%. Current study is on the location and transmission of Alternaria solani in tomato seeds. A total of 100 seed samples were collected from seed producers and farmers across Tamilnadu. Seed was extracted from the collected fruits and subjected to various seed health testing methods. Five samples showing higher incidence of seed borne fungi were selected for studying the location and transmission of the pathogen. The results revealed that, Alternaria solani percentage of infection was detected to be higher under Standard Blotter Method (18%). Locality of Alternaria solani ranged up to 35% in seed coat, 48% in cotyledons and 17% in embryonic axis and the field experiments shown 42% seed to seed transmission of the pathogen.

S P Mohan Kumar – One of the best experts on this subject based on the ideXlab platform.

  • Tomato early blight (Alternaria solani): Location and transmission
    Phytopathology, 2020
    Co-Authors: Pr Renganayaki, Shobha Sundareswaran, S P Mohan Kumar, A Kamalakannan
    Abstract:

    Tomato is one of the popular vegetable crops grown in India and Tamilnadu. Early blight is the most important disease of tomato caused by Alternaria solani which is seed borne in nature can reduce the seed germination and yield up to 70%. Current study is on the location and transmission of Alternaria solani in tomato seeds. A total of 100 seed samples were collected from seed producers and farmers across Tamilnadu. Seed was extracted from the collected fruits and subjected to various seed health testing methods. Five samples showing higher incidence of seed borne fungi were selected for studying the location and transmission of the pathogen. The results revealed that, Alternaria solani percentage of infection was detected to be higher under Standard Blotter Method (18%). Locality of Alternaria solani ranged up to 35% in seed coat, 48% in cotyledons and 17% in embryonic axis and the field experiments shown 42% seed to seed transmission of the pathogen.

Shobha Sundareswaran – One of the best experts on this subject based on the ideXlab platform.

  • Tomato early blight (Alternaria solani): Location and transmission
    Phytopathology, 2020
    Co-Authors: Pr Renganayaki, Shobha Sundareswaran, S P Mohan Kumar, A Kamalakannan
    Abstract:

    Tomato is one of the popular vegetable crops grown in India and Tamilnadu. Early blight is the most important disease of tomato caused by Alternaria solani which is seed borne in nature can reduce the seed germination and yield up to 70%. Current study is on the location and transmission of Alternaria solani in tomato seeds. A total of 100 seed samples were collected from seed producers and farmers across Tamilnadu. Seed was extracted from the collected fruits and subjected to various seed health testing methods. Five samples showing higher incidence of seed borne fungi were selected for studying the location and transmission of the pathogen. The results revealed that, Alternaria solani percentage of infection was detected to be higher under Standard Blotter Method (18%). Locality of Alternaria solani ranged up to 35% in seed coat, 48% in cotyledons and 17% in embryonic axis and the field experiments shown 42% seed to seed transmission of the pathogen.