J. Tang, L. Jiang, X. Wang, Y. Zou, X. Wang, Q. Cai, L. Lou
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引用次数: 0
Abstract
The use of plant growth-promoting bacteria is an eco-friendly way to improve crops’ tolerance to salinity. To obtain more effective bacteria, halotolerant bacteria with plant growth-promoting attributes were isolated and screened out from salt-affected areas. Their abilities to alleviate salt stress on maize were further evaluated. The results showed that 11 of 268 strains displayed at least three plant growth-promoting traits, and some of them promoted growth, decreased Na+ accumulation and increased K+/Na+ ratios of maize seedlings under salt stress. The elongation and biomass of maize seedlings were significantly correlated to K+/Na+ ratios of maize seedlings after strain treatment, not the P-solubilization of strains. The maize seedling growth, Na+ and K+ accumulation were affected by indole-3-acetic acid levels that plant growth-promoting bacteria secreted. Among 11 strains, Hm18 and Pt07 which belong to Bacillus altitudinis and Pantoea agglomerans, respectively, increased maize seedling growth and K+/Na+ ratio in maize seedlings. Strains Hm18 and Pt07 alleviated growth inhibition and cell membrane injuries of maize seedlings caused by salt stress in soil. Additionally, Hm18 and Pt07 reduced Na+ accumulation and increased K+/Na+ ratios in maize under soil conditions as well. Overall, plant growth-promoting bacteria alleviated the detrimental effects of maize seedlings caused by salt stress through increasing K+/Na+ ion balance, which correlated to indole-3-acetic acid produced by bacteria. Hm18 and Pt07 increased salt tolerance and growth of maize seedlings grown in saline soil. These results provided potential beneficial bacteria resources for maize production in saline soil.
期刊介绍：
International Journal of Environmental Science and Technology (IJEST) is an international scholarly refereed research journal which aims to promote the theory and practice of environmental science and technology, innovation, engineering and management.
A broad outline of the journal''s scope includes: peer reviewed original research articles, case and technical reports, reviews and analyses papers, short communications and notes to the editor, in interdisciplinary information on the practice and status of research in environmental science and technology, both natural and man made.
The main aspects of research areas include, but are not exclusive to; environmental chemistry and biology, environments pollution control and abatement technology, transport and fate of pollutants in the environment, concentrations and dispersion of wastes in air, water, and soil, point and non-point sources pollution, heavy metals and organic compounds in the environment, atmospheric pollutants and trace gases, solid and hazardous waste management; soil biodegradation and bioremediation of contaminated sites; environmental impact assessment, industrial ecology, ecological and human risk assessment; improved energy management and auditing efficiency and environmental standards and criteria.
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