Effective microorganisms improve growth performance, alter nutrients acquisition and induce compatible solutes accumulation in common bean (Phaseolus vulgaris L.) plants subjected to salinity stress

Abstract

Effective microorganisms improve growth performance, alter nutrients acquisition and induce compatible solutes accumulation in common bean (Phaseolus vulgaris L.) plants subjected to salinity stress Abstract No information is available concerning effective microorganisms (EM) influence on the ionic and osmotic responses in plants grown in salty soils. Therefore, as a first approach, this study focuses on the contribution of EM to nutrient acquisition and compatible solutes accumulation in salt-stressed plants. It assesses some mechanisms underlying alleviation of salt toxicity by EM application, and also directs to establish a possible interrelationship between EM application as well as ionic and osmotic stresses tolerance in plants exposed to saline soils. Phaseolus vulgaris cv. Nebraska plants were grown under non-saline or saline conditions (2.5 and 5.0 dS m -1 ) with and without EM application. Salinity stress significantly decreased growth, productivity, membrane stability index, relative water content, concentrations of N, P, K ? , Fe, Zn and Cu, and the ratios of K ? /Na ? , Ca 2? /Na ? and Mg 2? / Na ? . However, EM application protected plants against the detrimental effect of salinity and significantly improved the above parameters. Concentrations of Ca ?2 , Mg ?2 , soluble sugars, free amino acids, proline and glycinebetaine were increased under saline conditions; moreover they further increased in salt-stressed plants treated with EM. Lipid peroxidation, hydrogen peroxide content, electrolyte leakage and Na ? level were increased in response to salinity and significantly decreased when stressed plants treated by EM. Reduction in Na uptake together with a concomitant increase in N, P, K, Ca, Mg, Fe, Zn and Cu absorption and a high compatible solutes accumulation may be an efficient mechanism used by EM-treated plants to gain tolerance against salinity stress.

Influence of Amino Acids Mixture Application on Some Biochemical Aspects, Antioxidant Enzymes and Endogenous Polyamines of Vicia faba Plant Grown under Seawater Salinity Stress

“…Table 3 showed that MDA concentrations were increased in salt-stressed faba beans. Similar results were reported by Sadak et al (2010) and Abdelhamid et al (2013b) on faba beans, and Semida et al (2015) and Talaat et al (2015) on common beans. Abdallah et al (2013) who worked on safflower explained that MDA was increased in stressed plants and the MDA produced by lipid peroxidation of cell membrane is often used as an indicator of salt and oxidative damages and the levels of free radicals in living cells.…”

“…Salinity can affect plant physiological processes resulting in reduced growth and yield . During the course of salinity stress, active solute accumulation of osmotic solutes such as soluble carbohydrates, proteins and free amino acids is claimed to be an effective stress tolerance mechanism (Dawood et al 2014a;Talaat et al 2015;Sadak et al 2015). The adaptability of plant species to high salt concentrations in soil by lowering the tissue osmotic potential was accompanied by the accumulation of these osmotic solutes (Jaleel et al 2008).…”

Spatiotemporal Distribution of Soil Moisture and Salinity in the Taklimakan Desert Highway Shelterbelt

“…This process, which is known as secondary salinization, is a major environmental hazard [7,8] that threatens about 6% of the total global land area [9]. Salt accumulation in soil not only affects physical, chemical, and biological soil processes [10], but also reduces soil productivity [11], soil sustainability [12,13], and vegetation growth [14]. Soil salinity in the irrigated areas of Xinjiang has increased 40% from 1983 to 2005 [8].…”

Introducing Natural Farming in Black Pepper (Piper nigrumL.) Cultivation

“…Talaat et al [22] observed that EM contains selected species of microorganisms including predominant populations of lactic acid bacteria and yeasts, smaller numbers of photosynthetic bacteria, actinomycetes, and other types of organisms. All of these microorganisms are mutually compatible with one another and can coexist in liquid culture.…”

“…Composts inoculated with EM improve yields and nutrient uptake significantly for a variety of crops including wheat [11], soybean [6], rice [23], and cotton [32] more than plants grown with noninoculated composts. Talaat et al [22] stated that improved productivity in crops treated with EM-inoculated composts compared with untreated composts is related to hastened decomposition of organic compounds into plant available nutrients. Sharma et al [23] added that EM compost is a good source of nutrients for crops, which can provide favorable conditions for the growth of crops, promoting the mobilization of insoluble nutrients and activating the beneficial microorganisms in soils.…”