一株甘蔗内生菌鉴定及其溶磷能力的研究   总被引：1，自引：0，他引：1  

狄义宁  刘鲁峰  谢林艳  李咏梅  何鹏飞  崔文艳  李富生  何丽莲 《作物杂志》2018,34(6):68-111

采用形态观察、生理生化测定以及16S rDNA、gyrB和rpoB基因片段比对,对分离自甘蔗品种粤糖86-368茎部内的一株D5内生菌进行分类鉴定。在此基础上,使用平板溶磷圈法和液体培养法研究其溶磷能力,并通过盆栽试验探究其对玉米幼苗生长的影响。结果表明：D5菌株属于Pseudomonas extremorientalis;D5菌株对不同磷酸盐的溶磷能力表现不同,表现为磷酸三钙>植酸钙>磷酸铁,溶磷量分别为0.939±0.012、0.655±0.016、0.125±0.005mg/mL,同时,在溶磷过程中,液体培养基的pH均有不同程度的降低,活菌数除了在磷酸铁培养基中一直下降外,其他磷源培养基中均是先升后降的趋势。施用菌剂后,处理组（D5+P）比对照组（CK+P）玉米幼苗的总鲜重、总干重、苗株总磷含量分别增加45.92%、32.65%、45.01%。因此,D5菌株具有制备微生物菌肥的潜力。  相似文献   

Oxidative stress and antioxidant responses in juvenile Brazilian flounder <Emphasis Type="Italic">Paralichthys orbignyanus</Emphasis> exposed to sublethal levels of nitrite     

Lucas Campos Maltez  Luis André Luz Barbas  Lilian Fiori Nitz  Lucas Pellegrin  Marcelo Hideo Okamoto  Luís André Sampaio  José Maria Monserrat  Luciano Garcia 《Fish physiology and biochemistry》2018,44(5):1349-1362

This study evaluated the effects of short-term exposure to sublethal levels of nitrite on oxidative stress parameters and histology of juvenile Brazilian flounder Paralichthys orbignyanus. An assessment of fish recovery was also performed. Fish were exposed to 0.08 (control), 5.72, 10.43, and 15.27 NO₂-N mg L^?1 for 10 days followed by the same recovery time. Gill, liver, and muscle samples were collected after 1, 5, and 10 days of exposure and after recovery for the measurement of antioxidant capacity against peroxyl radicals (ACAP), glutathione-S-transferase (GST) activity, content of non-protein (NPSH) and protein thiols (PSH), and lipid peroxidation levels by thiobarbituric acid-reactive substances (TBARS) content. Nitrite exposure induced alterations which compromised the overall antioxidant system (reduced ACAP and GST activity) and enhanced oxidative damage in lipids and proteins. Increases in GST activity and NPSH and PSH contents were also demonstrated. The recovery period allowed for resumption of basal levels for all (treatment 5.72 NO₂-N mg L^?1) or some of the evaluated parameters (other treatments). In conclusion, exposure to nitrite concentrations from 5.72 to 15.27 NO₂-N mg L^?1 induced oxidative stress and antioxidant responses in juvenile Brazilian flounder. The 10-day recovery period was sufficient for a complete resumption of basal physiological condition of fish exposed to concentrations of up to 5.72 NO₂-N mg L^?1.  相似文献