Enhancement of Salt Stress Tolerance of Hordeum vulgare. L by Salt-Tolerant Bacteria

Abstract

BACKGROUND: Salinity is one of the major limiting factors in agriculture that affect the growth and productivity of crops. It is economically difficult to artificially purify the soil affected by salt. Therefore, the use of plant growthpromoting bacteria (PGPB) in an effort to reduce stress caused by salt is emerging as a cost-effective and environment-friendly method. In this study, the purpose was to isolate the salt-tolerant bacteria from the rhizosphere soil and identify their ability to promote plant growth under salt stress condition. METHODS AND RESULTS: The isolates KST-1, KST-2, AST-3, and AST-4 that showed plant growth-promoting activity for barley in salt conditions were close to Bacillus cereus (KST-1, KST-2, and AST-4) and Bacillus thuringiensis (AST-3) and showed high salt tolerance up to 7% of additional NaCl to the media. When inoculated to barley, the strains had only minor effect on the length of the barley. However, the concentrations of chlorophyll in the barley leaves were found to be higher from the bacteria-inoculated pots than those from the uninoculated control. In particular, the chlorophyll concentration in Bacillus cereus AST-4 experiment was 5.45 times higher than that of the uninoculated control under the same experimental condition. CONCLUSION(S):The isolated salt-tolerant bacteria were found to influence on chlorophyll concentration of the barley. As represented by the strain AST-4, microbes may suggest a cost-effective and environmentally benign method to alleviate salt stress of crops cultivated in saltaccumulated soils such as reclaimed lands.

Effect of Saline Soil and Crop Growth with Bottom Ash from Biomass Power Plant Based Wood Pellet

“…토양에서는 염분에 의한 투기성과 통기성이 낮아 지며 이에 따른 삼투포텐셜 감소로 인해 미생물 활성 저하 등 의 문제가 발생한다 [11]. 토양의 염분을 제거하기 위해 염분을 추출하는 작물 정식, 개량제 처리를 통한 Na 치환, 천연 퇴비 나 풋거름 시비, 과다한 관수를 통해 축적된 염분을 근권 아래 또는 밖으로 억제시키는 방식들이 있다 [12]. 그 중 관수를 통 한 제거 방식은 적용 방식이 간단하여 많이 활용하는 방식으 로 상당한 수자원을 소비하는 것이 특징인데, 최근 지구온난화 로 인해 농업용 수자원이 급격히 줄어들어 토양 염분화를 감 소시키기 위한 새로운 연구가 필요한 실정이다 [13,14].…”