IDENTIFICATION AND CHARACTERIZATION OF BACTERIAL PATHOGENS IN MEDICINAL, AROMATIC AND SPICE PLANTS OF ASSAM
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Date
2022
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AAU, Jorhat
Abstract
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).