Halobacillus marinus缓解马铃薯盐胁迫的研究
廖美智 , 王衍蘇 , 关宇奇 , 王宏宇 , 韩雪 , 石瑛
中国马铃薯 ›› 2025, Vol. 39 ›› Issue (6) : 429 -437.
Halobacillus marinus缓解马铃薯盐胁迫的研究
Research on Halobacillus marinus Alleviating Salt Stress in Potatoes
盐胁迫是影响作物生长发育的限制因素之一。马铃薯是中等耐盐作物,土壤盐渍化严重影响马铃薯的品质和产量,造成经济损失。近年来,植物根际促生菌(Plant growth-promoting rhizobacteria,PGPR)因其能够促进植物生长和增强植物耐逆性的特点,受到广泛关注。利用前期分离出的耐盐菌H. marinus以探究其在NaCl胁迫下与马铃薯幼苗的相互作用。耐盐菌H. marinus能够在120 g/L盐浓度的LB固体培养基上生长,并且在LB液体培养基中可以分泌12.820 mg/L的吲哚乙酸(Indole-3-acetic acid,IAA)。与NaCl处理相比,接种菌株H. marinus在同样的盐胁迫条件下马铃薯幼苗的株高、鲜重和干重分别提高19.54%、67.37%和65.36%,而根长无显著差异,且马铃薯幼苗的根系活力、抗坏血酸过氧化物酶活性和过氧化氢酶活性分别提高130.87%、85.48%和23.86%,而过氧化物酶活性无显著差异;丙二醛含量和超氧阴离子含量分别降低12.60%和29.62%。研究结果表明H. marinus能增强马铃薯对盐胁迫的耐受性,可以帮助苗期马铃薯在盐胁迫条件下恢复根系正常的生理代谢活动,抵御盐胁迫并促进其生长发育。该试验结果为微生物缓解马铃薯盐胁迫提供了重要的菌种资源,为盐渍化耕地的开发利用提供新思路。
Salt stress is one of the limiting factors affecting crop growth and development. Potato is a moderately salt-tolerant crop, and soil salinization severely impacts potato quality and yield, leading to economic losses. In recent years, plant growth-promoting Rhizobacteria (PGPR) have attracted widespread attention due to their ability to promote plant growth and enhance stress tolerance. In this study, the previously isolated salt-tolerant bacterium H. marinus was used to investigate its interaction with potato seedlings under NaCl stress. H. marinus was capable of growing on LB solid medium with a salt concentration of 120 g/L and secreted 12.820 mg/L of Indole-3-acetic acid (IAA) in LB liquid medium. Compared with the NaCl treatment alone, inoculation with H. marinus under the same salt stress conditions increased plant height, fresh weight, and dry weight of potato seedlings by 19.54%, 67.37%, and 65.36%, respectively, while root length showed no significant difference. Additionally, root activity, ascorbate peroxidase activity, and catalase activity in potato seedlings increased by 130.87%, 85.48%, and 23.86%, respectively, whereas peroxidase activity did not change significantly. Meanwhile, malondialdehyde content and superoxide anion content decreased by 12.60% and 29.62%, respectively. The results indicate that H. marinus can enhance potato tolerance to salt stress, helping potato seedlings restore normal physiological metabolic activities in their root systems under saline conditions, thereby enabling them to withstand salt stress and promote growth and development. This study would provide important bacterial strain resources for mitigating salt stress in potatoes using microorganisms and offer new insights for the development and utilization of saline cultivated land.
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黑龙江省自然科学基金(LH2023C005)
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