5株解钾菌解钾能力和抗旱效应的比较

Comparison of Potassium Solubilization Ability and Drought Resistance of Five Potassium-Solubilizing Bacteria

为筛选适用于制备干旱地区生物菌肥的解钾菌,以钾长石粉作为唯一钾源,研究5株解钾菌(LG1、LG8、WG33、WG36和WG40)的解钾能力,将5株解钾菌的发酵液接种到玉米幼苗,模拟干旱,研究其对玉米幼苗抗旱性的影响。结果表明,5株菌株都具有一定的解钾能力,大小顺序为WG33>LG1>WG40>WG36>LG8,WG33的解钾能力最强,经过发酵培养后其上清液中可溶性钾含量达到7.73 mg/L。接种5株解钾菌后,进行干旱处理,玉米幼苗株高增幅均大于对照,丙二醛含量降低、过氧化物酶(POD)和超氧化物歧化酶(SOD)活性提高,说明5种解钾菌均可提高玉米幼苗的抗旱性。

In order to screen potassium-solubilizing bacteria suitable for the preparation of biological fertilizers in arid regions,potassium feldspar powder was used as the sole potassium source,the potassium-solubilizing ability of five bacteria strains(LG1,LG8,WG33,WG36 and WG40)was explored,and an experiment was conducted under simulated drought condition to explore the effects of inoculating fermentation broth on the drought resistance of maize seedlings.Results showed that,all the five strains had potassium-solubilizing ability,sequenced as WG33>LG1>WG40>WG36>LG8,WG33 ranked the first,and the soluble potassium content in the fermentation supernatant reached 7.73 mg/L.Under drought condition,inoculating five potassium-solubilizing bacteria enhanced the plant height of maize seedlings,decreased the MDA content and increased POD,SOD activities,indicating that the five potassium-solubilizing bacteria strains can improve the drought resistance of maize seedlings.