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首页> 外文期刊>Plant and Soil >Arsenic transformation by Azospirillum brasilense Sp245 in association with wheat (Triticum aestivum L.) roots.
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Arsenic transformation by Azospirillum brasilense Sp245 in association with wheat (Triticum aestivum L.) roots.

机译：巴西偶氮螺旋藻Sp245与小麦（Triticum aestivum L.）根部的砷转化。

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The transformation of sodium arsenite and sodium arsenate by the rhizospheric nitrogen-fixing bacterium Azospirillum brasilense Sp245 in association with wheat (Triticum aestivum L. 'Saratovskaya 29') was studied. The effect produced by the A. brasilense strain on the morphological parameters of wheat in an As-polluted environment was examined. The plants were cultivated in a hydroponic system, with glass beads serving as a support for root growth. The plant-growth medium (an artificial soil solution) was deficient in P and Fe. The total initial As concentrations used were 75, 750, and 7500 micro g l-1. The As compounds used contained sodium arsenate and sodium arsenite at an As(V):As(III) ratio of 1:3.6 (in terms of As) in all experiments. Inoculation of A. brasilense Sp245 led to a decrease in the overall root length and to the formation of lateral roots; both effects are possibly related to the bacteria's ability to synthesize auxins. Inoculation also changed the As(V): As(III) ratio of the plant-growth medium. In all experiments, the concentration of As(V) in the nutrient medium increased relative to the initial one and was approximately 1.5-fold higher than that in the medium of uninoculated plants. This value slightly decreased (1.6>1.5>1.4) with increasing concentration of As in the medium. Azospirillum-inoculated plants accumulated less As than did the surface-sterilized uninoculated plants. This study shows that A. brasilense Sp245 in association with wheat changes the speciation, bioavailability, and plant uptake of As..
机译：研究了根际固氮细菌巴西细螺旋藻Sp245与小麦（Triticum aestivum L.'Saratovskaya 29'）的亚砷酸钠和砷酸钠的转化。研究了巴西假单胞菌菌株对砷污染环境下小麦形态参数的影响。将植物种植在水培系统中，玻璃珠充当根生长的支撑。植物生长培养基（一种人工土壤溶液）缺乏磷和铁。所使用的总初始As浓度为75、750和7500 micro g l-1。在所有实验中，所使用的As化合物均包含As（V）：As（III）比为1：3.6（以As计）的砷酸钠和亚砷酸钠。接种巴西根霉Sp245会导致根总长度的减少和侧根的形成。这两种作用都可能与细菌合成植物生长素的能力有关。接种也改变了植物生长培养基的As（V）∶As（III）比例。在所有实验中，营养培养基中As（V）的浓度均相对于初始浓度有所增加，比未接种植物的培养基中的As（V）浓度高约1.5倍。随着培养基中As浓度的增加，该值略有下降（1.6> 1.5> 1.4）。与经表面灭菌的未接种植株相比，接种了Azospirillum的植株积累的量少。这项研究表明，A。brasilense Sp245与小麦结合会改变As的形态，生物利用度和植物吸收。

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