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식물생장촉진 Bacillus sp. SB19 균주의 케일 처리에 대한 가뭄 스트레스 완화 효과

Mitigation Effect of Drought Stress by Plant Growth-promoting Bacterium Bacillus sp. SB19 on Kale Seedlings in Greenhouse

이상엽|김정준|한지희|김다연
한국유기농업학회 (Korea Association Of Organic Agriculture)|2016.11|한국유기농업학회지 (Korea Journal of Organic Agriculture)|제24권 제4호|pp. 833-847

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키워드

Bacillus sp.drought stress resistanceleafy vegetableplant growth promotion

초록

Drought stress is a major agricultural limitation to crop productivity worldwide, especially by which leafy vegetables, plant leaves eaten as vegetable, could be more lethal. The study was carried out to know the effect of drought tolerance plant growth promoting bacteria (PGPB) on water stress of kale seedlings. A total of 146 morphologically distinct bacterial colonies were isolated from bulk soil and rhizosphere soil of leafy vegetables and screened for plant growth promoting microbioassay in greenhouse. Out of them the isolate SB19 significantly promoted the growth of kale seedlings in increasement of about 42% of plant height (14.1 ㎝), 148% of leaf area (19.0 ㎠) and 138% of shoot fresh weight (1662.5 ㎎) attained by the bacterially treated plants compared to distilled water treated control (9.9 ㎝, 7.7 ㎠, 698.8 ㎎). Shoot water content of SB19 treated kale seedlings (1393.8 ㎎) was also increased about 152% compared with control (552.5 ㎎). The SB19 isolated from bulk soil of kale plant in Iksan, Korea, was identified as species of Bacillus based on 16S rRNA gene sequencing analysis. We evaluated the effect of drought tolerance by the Bacillus sp. SB19 on kale seedlings at 7th and 14th days following the onset of the water stress and watering was only at 7th day in the middle of test. In the survey of 7th and 14th day, there were mitigation effect of drought stress in kale seedlings treated with 106 and 107 cell mL-1 of SB19 compared to distilled water treated control. Especially, there were more effective mitigation of drought damage in kale seedlings treated with 107 cell mL-1 than 106 cell mL-1. Further, although drought injury of bacterially treated kale seedlings were not improved at 14th day compared with 7th day, drought injury of 107 cell mL-1 of SB19 treated kale seedlings were not happen rapidly but developed over a longer period of time than 106 cell mL-1 of SB19 or control. The diffidence of results might be caused by the concentration of bacterial suspension. This study suggests that beneficial plant-microbe interaction could be a important role of enhancement of water availability and also provide a good method for improving quality of leafy vegetables under water stress conditions.

Abstract

Drought stress is a major agricultural limitation to crop productivity worldwide, especially by which leafy vegetables, plant leaves eaten as vegetable, could be more lethal. The study was carried out to know the effect of drought tolerance plant growth promoting bacteria (PGPB) on water stress of kale seedlings. A total of 146 morphologically distinct bacterial colonies were isolated from bulk soil and rhizosphere soil of leafy vegetables and screened for plant growth promoting microbioassay in greenhouse. Out of them the isolate SB19 significantly promoted the growth of kale seedlings in increasement of about 42% of plant height (14.1 ㎝), 148% of leaf area (19.0 ㎠) and 138% of shoot fresh weight (1662.5 ㎎) attained by the bacterially treated plants compared to distilled water treated control (9.9 ㎝, 7.7 ㎠, 698.8 ㎎). Shoot water content of SB19 treated kale seedlings (1393.8 ㎎) was also increased about 152% compared with control (552.5 ㎎). The SB19 isolated from bulk soil of kale plant in Iksan, Korea, was identified as species of Bacillus based on 16S rRNA gene sequencing analysis. We evaluated the effect of drought tolerance by the Bacillus sp. SB19 on kale seedlings at 7th and 14th days following the onset of the water stress and watering was only at 7th day in the middle of test. In the survey of 7th and 14th day, there were mitigation effect of drought stress in kale seedlings treated with 106 and 107 cell mL-1 of SB19 compared to distilled water treated control. Especially, there were more effective mitigation of drought damage in kale seedlings treated with 107 cell mL-1 than 106 cell mL-1. Further, although drought injury of bacterially treated kale seedlings were not improved at 14th day compared with 7th day, drought injury of 107 cell mL-1 of SB19 treated kale seedlings were not happen rapidly but developed over a longer period of time than 106 cell mL-1 of SB19 or control. The diffidence of results might be caused by the concentration of bacterial suspension. This study suggests that beneficial plant-microbe interaction could be a important role of enhancement of water availability and also provide a good method for improving quality of leafy vegetables under water stress conditions.

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