作物学报 ›› 2024, Vol. 50 ›› Issue (10): 2538-2549.doi: 10.3724/SP.J.1006.2024.44046
刘宏缘(), 岑锎, 刘怡琳, 楼雪怡, 张雅婷, 吴嘉睿, 谭驭宇, 祝嘉丞, 方芳, 刘鹏*(
)
LIU Hong-Yuan(), CEN Kai, LIU Yi-Lin, LOU Xue-Yi, ZHANG Ya-Ting, WU Jia-Rui, TAN Yu-Yu, ZHU Jia-Cheng, FANG Fang, LIU Peng*(
)
摘要:
镉(cadmium, Cd)作为对大豆等粮食类作物毒害最大的重金属之一, 不仅会抑制植物生长发育, 还会损害其光合系统致使光合速率下降。目前对于镉修复技术的探讨多集中于施加植物激素、改变种植模式等方向, 微生物与植物互作的研究仍有待探索。本研究为探究复合白腐真菌(White rot fungi)对镉污染的修复效果和固定化技术的实际应用价值, 以4种白腐真菌和大豆作为供试材料, 制备固态菌剂并对大豆设置土培处理, 且模拟镉污染土壤的浓度为0、50、100 mg L-1, 对应每个浓度分别进行3种处理(CK组-不做处理、EG1组-加入游离菌株、EG2组-加入固态菌剂), 研究混菌发酵与固定化技术对菌株吸附效能的影响, 同时探明镉毒害、固定化菌球以及大豆植株三者间的关联性。结果表明: (1) 除黄孢原毛平革菌外, 其余3种菌株兼容性良好。(2) 当混菌菌株组别为凤尾:云芝等于1∶1时, 处理浓度为50 mg L-1的镉溶液时可达到87.33%的吸附率。(3) 为延长混合菌株的使用时效, 提高吸附效果, 以海藻酸钠(SA)质量浓度为10 g L-1、生物炭(BC)质量浓度为15 g L-1、加菌量为2%制得的PVA固定化小球, 在加入适量添加剂后96 h吸附率可达(95.12±1.68)%。(4) 将固定化混菌菌剂施加入模拟镉污染土壤后, 大豆的各项生长和光合指标受到的抑制作用均得到缓释, 其中Fo的最大降幅为42.5%, Fv/Fm最大增幅为17.2%。(5) 大豆的抗氧化系统在菌剂处理14 d时得到增强, CK组中SOD、POD、CAT 3种酶最高活性均得以提升, 分别为27.34%、12.41%、13.58%; 此外, Pro及MDA含量分别呈上升和下降趋势, 共同表现出植物抗性的提高。综上, 镉胁迫下植株的PSII光化学反应中心受到抑制, 混合菌株固定化与单个或游离状态的菌株相比吸附效率更高, 施加固态菌剂后可有效开启大豆的光保护机制, 产生渗透调节物质, 同时激活抗氧化系统, 保证了大豆体内稳定的氧化还原环境以应对镉胁迫。
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