摘要
【目的】本研究分析三株固氮菌PGPR性状特征及其对中国青菜产量和土壤酶活的影响。【方法】氮(N)-修复(固氮)细菌被认为是一种能够促进植物生长和增产的施氮方式。在本研究中,我们用无氮培养基分离出了30株根际固氮细菌:11株来自小麦根际,16株来自中国青菜根际和3株来自莲花根际。基于16S r DNA序列分析,对小麦、中国青菜和莲花等植物根际中属于类芽孢杆菌属的主要固氮细菌进行研究。【结果】本研究从这30株固氮菌中筛选出三株属于类芽孢杆菌属(Paenibacillus)的细菌,分别命名为P-4、W-7和L-3,它们的固氮酶活性不但高于对照组(圆褐固氮菌),而且可以有效抑制两种或三种植物病原菌的生长,即核盘菌(Sclerotinia sclerotiorum)、玉蜀黍赤霉(Gibberella zeae)和棉花黄萎病菌(Verticillium dahliae)。菌株W-7还具有溶解难溶磷的能力,中国青菜在接种菌株W-7和L-3后,其鲜重显著增加,同时改变了田间土壤蔗糖酶、磷酸酶和过氧化氢酶的活性;而接种了菌株P-4对植物的生长和酶活性没有显著的影响。【结论】土壤蔗糖酶、磷酸酶和过氧化氢酶活性与中国青菜的生物量呈正相关。同时,菌株W-7和L-3具有促进植物产量和提高土壤质量的良好潜力。
[Objective] Nitrogen-fixing（diazotrophic） bacteria are considered possible alternative to nitrogen fertilizers for promoting plant growth and yield.This study was to run a phylogenetic analysis and determine the PGPR traits of the isolated diazotrophic bacteria and characterize the effect of diazotrophic bacteria on Chinese pakchoi yield and soil enzyme activities.[Methods] We isolated 30 diazotrophic bacteria from rhizosphere of wheat（11 isolates）,Chinese pakchoi（16 isolates）,and lotus（3 isolates） on N-free medium plates.Based on 16 S r RNA sequence analysis,the dominant diazotrophic bacteria of wheat,Chinese pakchoi,and lotus belonged to the genus Paenibacillus.[Results] Three multi-function diazotrophic bacteria designated as Paenibacillus spp.P-4,W-7 and L-3 were screened from these 30 diazotrophic.The nitrogenase activities of P-4,W-7 and L-3 were higher than the that of Azotobacter chroococcum used as the control.Strains P-4,W-7 and L-3 can inhibit the growth of two or three plant pathogens of Sclerotinia sclerotiorum,Gibberella zeae and Verticillium dahliae.Strain W-7 has also the phosphate solubilizing ability.Inoculation with Paenibacillus spp.W-7 or L-3 significantly increased the shoot fresh weight of Chinese pakchoi and changed the activity of soil sucrase,phosphatase,and catalase under field conditions,whereas inoculation with Paenibacillus sp.P-4 had no significant effect on plant growth or enzyme activity.[Conclusion] Paenibacillus sp.W-7 and L-3 have good potential to promote plant yield and improve soil quality.
作者
牛鑫斌
杨慧
孙健光
陈倩
王玉炯
徐秉良
张晓霞
高淼
Xinbin Niu;Hui Yang;Jianguang Sun;Qian Chen;Yujiong Wang;Bingliang Xu;Xiaoxia Zhang;Miao Gao(Key Laboratory of Microbial Resources Collection and Preservation, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China;Key Laboratory of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, School of Life Sciences, Ningxia University, Yinchuan 750021, Ningxia Hui Autonomous Region, China;Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province, College of Plant Protection, Gansu Agricultural University, Lanzhou 730070, Gansu Province, China;The Sci-technology Center, Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China)
出处
《微生物学报》
CAS
CSCD
北大核心
2018年第7期1213-1223,共11页
Acta Microbiologica Sinica
基金
国家自然科学基金(316700005)
国家重点研发计划(2016YFD0201100)
关键词
固氮细菌
PGPR特征
类芽孢杆菌
植物促生
土壤酶
diazotrophic bacteria
PGPR characterizations
Paenibacillus
plant promotion
soil enzyme
