Department of Botany, The University of Burdwan, Golapbag, Purba Bardhaman, West Bengal, 713104, India.
Curr Microbiol. 2024 Oct 24;81(12):425. doi: 10.1007/s00284-024-03951-y.
Arsenic exerts detrimental impacts on primary metabolism in plants, leading to reduced crop yield. Some arsenic-resistant plant growth-promoting bacteria (PGPB) help plants by providing some plant hormones to sustain their growth and development under arsenic stress. Here, seven different species of Bacillus were isolated from arsenic-contaminated groundwater of West Bengal, India. Those species were capable of growing in the presence of > 3.12 g/L arsenate (AsV) and > 0.65 g/L arsenite (AsIII) salts and also resist different heavy metals like Cu, Fe, Co, Zn, Pb, etc. They were susceptible to multiple groups of antibiotics like beta-lactam, aminoglycosides, etc. All species were capable of detoxifying arsenite and influenced rice seedlings' growth in the presence of arsenic salts by their capabilities like nitrogen-fixing ability, phosphate solubilization, indole 3-acetic acid (IAA), gibberellic acid (GA), proline production, etc. Most species helped enhance root and shoot lengths under arsenic stress. These primary findings suggest that those Bacillus spp. could be used as potential bio-fertilizers in arsenic-contaminated agricultural fields.
砷对植物的初级代谢产生有害影响，导致作物产量降低。一些砷抗性植物促生菌（PGPB）通过向植物提供一些植物激素，帮助植物在砷胁迫下维持生长和发育。在这里，从印度西孟加拉邦受砷污染的地下水中共分离出 7 种不同的芽孢杆菌。这些物种能够在存在超过 3.12 g/L 砷酸盐（AsV）和超过 0.65 g/L 亚砷酸盐（AsIII）盐的情况下生长，并且还能抵抗铜、铁、钴、锌、铅等多种重金属。它们对包括β-内酰胺类和氨基糖苷类在内的多组抗生素敏感。所有的物种都能够解毒亚砷酸盐，并通过固氮能力、磷酸盐溶解能力、吲哚-3-乙酸（IAA）、赤霉素（GA）、脯氨酸产生等能力影响水稻幼苗在砷盐存在下的生长。大多数物种有助于在砷胁迫下增强根和茎的长度。这些初步发现表明，这些芽孢杆菌可以作为受砷污染农田的潜在生物肥料。
