摘要
向含解淀粉芽孢杆菌SQR9的生物有机肥中添加山梨醇研制了新型生物有机肥,并通过黄瓜盆栽和拟南芥培养试验研究了该新型生物有机肥的促生效应与机理。结果表明,含解淀粉芽孢杆菌SQR9的生物有机肥对黄瓜具有显著促生效果,添加山梨醇有利于促进解淀粉芽孢杆菌SQR9在土壤中定殖,能进一步提高生物有机肥的促生效应。施用该新型生物有机肥能显著提高土壤中速效养分的含量以及黄瓜对养分的吸收。山梨醇能有效促进菌株SQR9分泌生长素(吲哚乙酸,IAA),进而促进野生型拟南芥根系的生长,而在使用IAA不敏感突变体时促生效果消失,说明山梨醇促进有益菌SQR9分泌IAA是该新型生物有机肥显著促进作物生长的机理之一。本研究提出了新型生物有机肥研发的新思路,为植物促生菌新应用模式的开发提供了理论依据。
【Objective】In this study, a novel bio-organic fertilizer was designed by adding sorbitol, which is one of the preferred carbon sources for the functional strain Bacillus amyloliquefaciens SQR9, to the normal bio-organic fertilizer rich in strain SQR9(2×10^(8) CFU·g^(–1)). The plant growth promotion effect was evaluated. The mechanism for elevation of plant growth promotion effect of the normal bio-organic fertilizer by sorbitol addition was studied. 【Method】The effect of this novel bio-organic fertilizer on cucumber growth, soil biological and chemical properties was evaluated by pot experiments. The effect of sorbitol on plant growth promotion and stimulating IAA(indole-3-acetic acid) production by strain SQR9-gfp was investigated by culturing experiment using Arabidopsis. 【Result】The pot experiment showed that the application of this novel bio-organic fertilizer could promote cucumber growth by increasing the soil nutrient availability and the colonization of strain SQR9-gfp. The addition of sorbitol could promote IAA production by strain SQR9-gfp. Comparing to the wild type Arabidopsis, the plant growth promotion effect of sorbitol addition vanished on the IAA insensitive mutant Arabidopsis pin2. 【Conclusion】These results suggest that the application of this novel bio-organic fertilizer can promote plant growth. The addition of sorbitol can promote IAA production by SQR9-gfp and this is one of the mechanisms through which the novel bio-organic fertilizer boosted plant growth.
作者
方丹
朱明珠
魏梦玉
杨玉婷
薛超
沈其荣
FANG Dan;ZHU Mingzhu;WEI Mengyu;YANG Yuting;XUE Chao;SHEN Qirong(Jiangsu Provincial Key Lab for Organic Solid Waste Utilization,The Key Laboratory of Plant Immunity,Jiangsu Collaborative Innovation Center for Solid Organic Wastes,Educational Ministry Engineering Center of Resource-saving Fertilizers,College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China;Key Laboratory of Green and Smart Fertilizer Innovation,Ministry of Agriculture and Rural Affairs,Nanjing Sinong Bio-organic Fertilizer Institute,Nanjing 210031,China)
出处
《土壤学报》
CAS
CSCD
北大核心
2022年第6期1606-1615,共10页
Acta Pedologica Sinica
基金
国家重点研发专项项目(2017YFD0200805)
国家自然科学基金项目(31902113)
中央高校基本科研业务费(KYXK202010)共同资助。
关键词
解淀粉芽孢杆菌SQR9
山梨醇
生物有机肥
促生
生长素
Bacillus amyloliquefaciens SQR9
Sorbitol
Bio-organic fertilizer
Growth promotion
Indole-3-acetic acid
