Vanissa Tchuisseu Tchakounté Gylaine, Berger Beatrice, Patz Sascha, Becker Matthias, Turečková Veronika, Novák Ondřej, Tarkowská Danuše, Henri Fankem, Ruppel Silke
Leibniz Institute of Vegetable and Ornamental Crops Grossbeeren, Theodor- Echtermeyer-Weg 1, 14979 Grossbeeren, Germany.
Department of Plant Biology, Faculty of Sciences, University of Douala, P.O. Box 24157 Douala, Cameroon.
Microorganisms. 2020 Jul 4;8(7):1005. doi: 10.3390/microorganisms8071005.
Salinity and phosphorus (P) deficiency are among the most serious soil factors constraining crop productivity. A proposed strategy for alleviating these stresses is supporting plants by inoculation with growth-promoting rhizobacteria (PGPR). Here, a comparison of the ability of two maize composite and two F1 hybrid varieties to tolerate a P deficiency in either a saline or a non-saline environment showed that the uptake of nutrients by all four entries was significantly reduced by the imposition of both soil salinity and P deficiency, and that their growth was compromised to a similar extent. Subsequently, the ameliorative effect of inoculation with three strains of either sp. or sp. in an environment, which suffered simultaneously from salinity and P deficiency, was investigated. Inoculation with each of the strains was found to limit the plants' uptake of sodium cations, to increase their uptake of potassium cations, and to enhance their growth. The extent of the growth stimulation was more pronounced for the composite varieties than for the F1 hybrid ones, although the amount of biomass accumulated by the latter, whether the plants had been inoculated or not, was greater than that of the former varieties. When the bacterial strains were cultured in vitro, each of them was shown as able to produce the phytohormones auxin, abscisic acid, gibberellins, and cytokinins. The implication is that since the presence in the rhizospere of both sp. and sp. strains can support the growth of maize in salinity-affected and P deficient soils in a genotype-dependent fashion, it is important to not only optimize the PGPR strain used for inoculation, but also to select maize varieties which can benefit most strongly from an association with these bacteria.
盐分和磷缺乏是限制作物生产力的最严重土壤因素。一种缓解这些胁迫的策略是通过接种促生根际细菌（PGPR）来支持植物生长。在此，对两个玉米复合品种和两个F1杂交品种在盐渍或非盐渍环境中耐受磷缺乏能力的比较表明，土壤盐分和磷缺乏同时存在时，所有四个品种的养分吸收均显著降低，且它们的生长受到类似程度的影响。随后，研究了在同时遭受盐分和磷缺乏的环境中接种三种 菌或 菌菌株的改善效果。发现接种每种菌株都能限制植物对钠离子的吸收，增加对钾离子的吸收，并促进其生长。复合品种的生长刺激程度比F1杂交品种更明显，尽管后者无论是否接种，积累的生物量都大于前者品种。当这些细菌菌株在体外培养时，发现它们每一种都能产生植物激素生长素、脱落酸、赤霉素和细胞分裂素。这意味着由于 菌和 菌菌株在根际的存在能够以基因型依赖的方式支持玉米在受盐分影响和磷缺乏的土壤中生长，因此不仅要优化用于接种的PGPR菌株，还要选择能从与这些细菌的共生关系中受益最大的玉米品种，这一点很重要。
