Department of Biological Sciences, Faculty of Agriculture, Science and Technology, North-West University, Private Bag X2046, Mmabatho 2735, South Africa.
Biotechnol Lett. 2010 Nov;32(11):1559-70. doi: 10.1007/s10529-010-0347-0. Epub 2010 Jul 16.
The rhizosphere is the soil-plant root interphase and in practice consists of the soil adhering to the root besides the loose soil surrounding it. Plant growth-promoting rhizobacteria (PGPR) are potential agents for the biological control of plant pathogens. A biocontrol strain should be able to protect the host plant from pathogens and fulfill the requirement for strong colonization. Numerous compounds that are toxic to pathogens, such as HCN, phenazines, pyrrolnitrin, and pyoluteorin as well as, other enzymes, antibiotics, metabolites and phytohormones are the means by which PGPR act, just as quorum sensing and chemotaxis which are vital for rhizosphere competence and colonization. The presence of root exudates has a pronounced effect on the rhizosphere where they serve as an energy source, promoting growth and influencing the root system for the rhizobacteria. In certain instances they have products that inhibit the growth of soil-borne pathogens to the advantage of the plant root. A major source of concern is reproducibility in the field due to the complex interaction between the plant (plant species), microbe and the environment (soil fertility and moisture, day length, light intensity, length of growing season, and temperature). This review listed most of the documented PGPR genera and discussed their exploitation.
根际是土壤-植物根系的相互作用界面，实际上由附着在根系上的土壤以及周围松散土壤组成。植物促生根际细菌（PGPR）是植物病原菌生物防治的潜在手段。生物防治菌株应该能够保护宿主植物免受病原体的侵害，并满足强烈定植的要求。许多对病原体有毒的化合物，如 HCN、苯并嗪、吡咯并菌素和吡咯霉素以及其他酶、抗生素、代谢物和植物激素，是 PGPR 作用的方式，就像群体感应和趋化性一样，它们对根际竞争力和定植至关重要。根分泌物的存在对根际有显著影响，因为它们是一种能源，促进生长并影响根际细菌的根系。在某些情况下，它们的产物会抑制土壤传播病原体的生长，从而有利于植物根系。由于植物（植物物种）、微生物和环境（土壤肥力和水分、日照长度、光照强度、生长季节长度和温度）之间的复杂相互作用，现场的可重复性是一个主要关注点。本综述列出了大多数有文献记载的 PGPR 属，并讨论了它们的利用。
