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Unraveling the heavy metal resistance and biocontrol potential of Pseudomonas sp. K32 strain facilitating rice seedling growth under Cd stress.
Pramanik, Krishnendu; Mandal, Subhrangshu; Banerjee, Sandipan; Ghosh, Antara; Maiti, Tushar Kanti; Mandal, Narayan Chandra.
Afiliação
  • Pramanik K; Mycology and Plant Pathology Laboratory, Department of Botany, Siksha Bhavana, Visva-Bharati, Santiniketan, Birbhum, PIN-731235, West Bengal, India. Electronic address: kpbu.microbio@gmail.com.
  • Mandal S; Department of Botany, Siksha Bhavana, Visva-Bharati, Santiniketan, Birbhum, PIN-731235, West Bengal, India. Electronic address: s.mandalbolpur@gmail.com.
  • Banerjee S; Mycology and Plant Pathology Laboratory, Department of Botany, Siksha Bhavana, Visva-Bharati, Santiniketan, Birbhum, PIN-731235, West Bengal, India. Electronic address: sandipanmicbio@gmail.com.
  • Ghosh A; Microbiology Laboratory, Department of Botany, The University of Burdwan, Golapbag, Purba Bardhaman, P.O.-Rajbati, PIN-713104, West Bengal, India. Electronic address: antaraghosh4u@yahoo.in.
  • Maiti TK; Microbiology Laboratory, Department of Botany, The University of Burdwan, Golapbag, Purba Bardhaman, P.O.-Rajbati, PIN-713104, West Bengal, India. Electronic address: tkmbu@yahoo.co.in.
  • Mandal NC; Mycology and Plant Pathology Laboratory, Department of Botany, Siksha Bhavana, Visva-Bharati, Santiniketan, Birbhum, PIN-731235, West Bengal, India. Electronic address: mandalnc@visva-bharati.ac.in.
Chemosphere ; 274: 129819, 2021 Jul.
Article em En | MEDLINE | ID: mdl-33582538
Heavy metal and metalloid toxicity in agricultural land needs special attention for crop production essential to feed increasing population globally. Plant growth-promoting rhizobacteria (PGPR) are native biological agents that have tremendous potential to augment crop production in contaminated fields. This study involves selection and identification (through 16S rRNA gene sequence and FAME analysis) of a potent Pseudomonas sp. (strain K32) isolated from a metal-contaminated rice rhizosphere, aimed to its application for sustainable agriculture. Apart from multi-heavy metal(loid) resistance (Cd2+, Pb2+ and As3+ upto 4000, 3800, 3700 µg/ml respectively) along with remarkable Cd bioaccumulation potential (∼90%), this strain showed IAA production, nitrogen-fixation and phosphate solubilization under Cd stress. This bioaccumulation efficiency coupled with PGP traits resulted in the significant enhancement of rice seedling growth under Cd stress. This positive impact of K32 strain was clearly manifested in morphological and biochemical improvements under Cd stress including successful root colonization with rice roots. Cd uptake was also reduced significantly in seedlings in presence of K32 strain. Together with all mentioned properties, K32 showed bio-control potential against plant pathogenic fungi viz. Aspergillus flavus, Aspergillus parasiticus, Paecilomyces sp., Cladosporium herbarum, Rhizopus stolonifer and Alternaria alternata which establish K32 strain a key player in effective bioremediation of agricultural fields. Biocontrol potential was found to be the result of enzymatic activities viz. chitinase, ß-1,3-glucanase and protease which were estimated as 8.17 ± 0.44, 4.38 ± 0.35 and 7.72 ± 0.28 U/mg protein respectively.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Oryza / Poluentes do Solo / Metais Pesados Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Oryza / Poluentes do Solo / Metais Pesados Idioma: En Ano de publicação: 2021 Tipo de documento: Article