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Subject: Plant Pathology × Author: GOGOI, MOUSUMI × Start date: 2020 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    IDENTIFICATION AND CHARACTERIZATION OF BACTERIAL PATHOGENS IN MEDICINAL, AROMATIC AND SPICE PLANTS OF ASSAM
    (AAU, Jorhat, 2022) GOGOI, MOUSUMI; Borah, P K
    Accumulated knowledge of medicinal, aromatic and spice plants from ancient times helps to improve human health and life from generation to generation. There is tremendous scope for the extensive development of these important plants. But different diseases cause considerable loss of these plants that result in substantial economic loss to farmers. Although bacterial diseases cause severe loss to different medicinal, aromatic and spice plants in different states of our country, not much work had been done on bacterial diseases of these crops in Assam including other Northeastern states. Therefore, the present study was made to isolate, characterize and identify some of the bacterial pathogens associated with diseases of medicinal, aromatic and spice plants in Assam. Disease samples from medicinal, aromatic and spice plants viz., Chilli (Capsicum annum), Ginger (Zingiber officinale), Coriander (Coriandrum sativum), Betelvine (Piper betle), Pennywort (Centella asiatica), Giloy (Tinospora cordifolia) and Cardamom (Elettaria cardamomum) were collected from Golaghat, Jorhat, Karbi Anglong and Nagaon district of Assam. On the basis of cultural, morphological and biochemical studies the seven bacterial isolates were identified as genus Xanthomonas (in Chilli, Coriander, Betelvine and Giloy), Pantoea (in Pennywort), Bacillus (in Ginger) and Pseudomonas (in Cardamom). Further molecular characterization and phylogenetic analysis were done to identify the different bacterial isolates i.e., isolate MGH1 GOLAGHAT as Xanthomonas axonopodis pv. vesicatoria (bacterial leaf spot of chilli), isolate MGH2 GOLAGHAT as Bacillus pumilus (rhizome rot of ginger), isolate MGH3 JORHAT as Xanthomonas campestris pv. coriandri (bacterial leaf spot of coriander), isolate MGH4 GOLAGHAT as Xanthomonas axonopodis (bacterial leaf spot of betelvine), isolate MGH5 JORHAT as Pantoea ananatis (bacterial leaf spot of pennywort), isolate MGH6 JORHAT as Xanthomonas campestris (bacterial leaf spot of giloy) and isolate MGH7 JORHAT as Pseudomonas oryzihabitans (bacterial blight of cardamom).