Promotion of plant growth by ACC deaminase-producing soil bacteria

Evidence for the involvement of ACC deaminase from Pseudomonas putida UW4 in the biocontrol of pine wilt disease caused by Bursaphelenchus xylophilus

“…While P. putida UW4 was able to decrease crown gall formation and subsequent damage and loss of plant biomass, the acdS knockout mutant had no significant impact on protecting tomato plants from the A. tumefaciens infection (Hao et al 2007;Toklikishvili et al 2010). These results suggest that ACC deaminase activity, and the consequent lowering of deleterious plant ethylene levels, is the mechanism responsible for P. putida UW4 plant growth promotion activity as well as its ability to protect plants against biotic as well as abiotic stress (Grichko et al 2000;Wang et al 2000;Cheng et al 2007;Glick et al 2007;Hao et al 2007;Gamalero et al 2010;Toklikishvili et al 2010). In addition, it has been previously demonstrated that transgenic plants that express a bacterial acdS gene under the control of a root specific promoter are more resistant to pathogen induced stress as well as abiotic stress caused by salt, flooding and metals (Robison et al 2001a, b;Grichko and Glick 2001;Grichko et al 2000;Stearns et al 2005;Sergeeva et al 2006).…”

Phytoextraction of heavy metal polluted soils using Sedum plumbizincicola inoculated with metal mobilizing Phyllobacterium myrsinacearum RC6b

“…Production of ACC deaminase by PGPR is one of the key traits that attenuate ethylene-mediated plant growth inhibition through metabolizing the ethylene precursor, ACC into a-ketobutyrate (a-KB) and ammonia (Glick et al, 2007). In this study, the metal mobilizing strain RC6b was initially tested for its ability to grow on DF salts minimal medium with or without ACC.…”

“…isolated from metal polluted soils may help plants to produce more biomass by providing the plant with IAA that directly stimulates plant cell elongation, cell division, root initiation, and/or expression of specific genes (Prapagdee et al, 2013). Further, several plant associated bacteria were found to possess ACC deaminase suggesting their possible role in decreasing the amount of ACC as well as ethylene in the roots, thereby reducing heavy metal induced damages in plants (Glick et al, 2007). Similarly, recent studies have also indicated that under heavy metal stress conditions, inoculation with PGPR possessing the ability to produce siderophores and solubilize P increased growth of the inoculated plants primarily through enhancing the nutrient uptake in the inoculated plants (Ma et al, 2010).…”

Screening of Antifungal Bacillus spp. against Alternaria Blight Pathogen (Alternaria panax) and Anthracnose Pathogen (Colletotrichum gloeosporioides) of Ginseng

“…친환경 농업에 이용되는 길항미생물이 병원균에 미치는 기 작은 크게 3가지로 구분되고 있다. 1) 길항미생물이 병원균에 직접 기생하거나 병원균을 분해하여 죽게 하는 용균작용을 하 는 것, 2) 길항미생물의 항생물질에 의해 병원균의 필수 요소 를 억제하여 생육을 저지시키는 것 3) 에틸렌과 같은 길항미 생물의 대사 물질이 병원균에 간접적으로 해를 주는 것 등이 다 Glick et al, 2007). 특히 Bacillus spp.는 독성을 가진 항균성 물질을 세균의 세포 밖으로 분비 하여 병원균에 대해 길항 작용하는 것이 많으며 식물병 방제 를 위한 연구가 활발히 진행되고 있다.…”