【摘要】 用紫外线加氯化锂 (LiCl)复合诱变方式对释钾效能较强的土壤芽孢杆菌NBT菌株进行诱变处理 ,得到抗高渗 (2 %NaCl)突变株 32株。经高渗、高温及酸、碱诱导 ,突变株NBT 6和NBT 19能够在 10 %NaCl溶液中存活 ,同时能够耐受 35～ 5 5℃高温及pH 4～ 10的酸碱环境 ,两突变株的释钾活性与出发菌株相当 ,且传代稳定。辣椒、棉花盆栽试验表明 ,NBT 6和NBT 19不仅能在作物根际土壤增殖 ,而且能提高根际土壤有效磷、钾含量 ,改善植株的钾素营养 ,促进植株生长。更多还原

【Abstract】 A strain NBT capable of dissolving silicate minerals and promoting plant growth was treated with UV+LiCl, 32 high osmotic pressure resistant mutants(2% NaCl) were screened. Two mutants (NBT 6 and NBT 19 ) that could survive in the 10% of sodium chloride solution and resistant to high temperature (35-55℃) and acid base (pH 4-10 ) were obtained. In addition, the two mutants had the same ability as the starting strain (NBT) in dissolving potassium bearing minerals, and they were stable. Pot experiments for chili and cotton showed that the two mutants can propagate in rhizosphere, increase available P and K contents in rhizospheric soil, improve plant potassium nutrition, and promote plant growth.更多还原