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小麦内生真菌促进植物生长及耐受非生物胁迫特性的评估

Assessment of Plant Growth Promoting and Abiotic Stress Tolerance Properties of Wheat Endophytic Fungi.

作者信息

Ripa Farhana Alam, Cao Wei-Dong, Tong Shuai, Sun Jian-Guang

机构信息

Key Laboratory of Microbial Resources, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China.

出版信息

Biomed Res Int. 2019 Mar 27;2019:6105865. doi: 10.1155/2019/6105865. eCollection 2019.

Abstract

The aims of the present work were to isolate and characterize fungal endophytic communities associated with healthy wheat () plants, collected from the North China. Segregated endophytes were screened for their PGP traits, abiotic stresses (heavy metals, salinity, drought, and temperature), and antibiotic sensitivity. A total of 16 endophytic fungi were isolated using the culture-dependent approach from different tissue parts of wheat plants. Based upon their internal transcribed spacer (ITS) rDNA gene sequencing, 15 out of 16 isolates were selected for further analysis. In the contemporary investigation, a number of the tested endophytes exhibited fairly good 1-aminocyclopropane-1-carboxylic acid deaminase (ACCD) (0.03±0.011 to 1.43±0.01 mol -KB mg protein hr), indole acetic acid (IAA) (1.125±0.04 to36.12±0.004gml), and phosphate solubilizing index (PSI) (2.08±0.03to5.16±0.36) activities. More than 30% isolates gave positive result for siderophore and ammonia tests, whereas all exhibited catalase activity but only 2 (582PDA1 and 582PDA11) produced hydrogen cyanide. strains showed salt, heavy metals, and drought tolerance at high levels and also exhibited resistance to all the tested antibiotics. Strain 582PDA4 was found to be the most temperature (55°C) tolerant isolate. The findings of this study indicated that the microbial endophytes isolated from wheat plants possessing a crucial function to improve plant growth could be utilized as biofertilizers or bioagents to establish a sustainable crop production system.

摘要

本研究的目的是分离和鉴定从中国北方采集的健康小麦植株相关的真菌内生菌群落。对分离出的内生菌进行植物生长促进特性、非生物胁迫(重金属、盐度、干旱和温度)以及抗生素敏感性筛选。采用依赖培养的方法从小麦植株的不同组织部位共分离出16株内生真菌。基于其内部转录间隔区(ITS)rDNA基因测序,从16株分离物中选择了15株进行进一步分析。在当代研究中,许多受试内生菌表现出相当良好的1-氨基环丙烷-1-羧酸脱氨酶(ACCD)(0.03±0.011至1.43±0.01 μmol -KB mg蛋白小时)、吲哚乙酸(IAA)(1.125±0.04至36.12±0.004 μg/ml)和溶磷指数(PSI)(2.08±0.03至5.16±0.36)活性。超过30%的分离物对铁载体和氨测试呈阳性结果,而所有分离物均表现出过氧化氢酶活性,但只有2株(582PDA1和582PDA11)产生氰化氢。菌株表现出对盐、重金属和干旱的高度耐受性,并且对所有测试抗生素均有抗性。菌株582PDA4被发现是最耐温度(55°C)的分离物。本研究结果表明,从小麦植株中分离出的具有促进植物生长关键功能的微生物内生菌可作为生物肥料或生物制剂用于建立可持续作物生产系统。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9368/6457323/00859cee4953/BMRI2019-6105865.001.jpg

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