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草业学报 ›› 2024, Vol. 33 ›› Issue (4): 110-121.DOI: 10.11686/cyxb2023205

• 研究论文 • 上一篇    

盐爪爪根际土壤产IAA菌株分离及促生特性分析

程鑫宇1,2(), 王继莲1,2, 麦日艳古·亚生null1,2, 李明源1,2()   

  1. 1.喀什大学生命与地理科学学院,新疆 喀什 844006
    2.新疆帕米尔高原生物资源与生态自治区重点实验室,新疆 喀什 844006
  • 收稿日期:2023-06-23 修回日期:2023-08-28 出版日期:2024-04-20 发布日期:2024-01-15
  • 通讯作者: 李明源
  • 作者简介:E-mail: mingyuan_lee@163.com
    程鑫宇(2001-),男,河南洛阳人,在读本科。E-mail: cxy110423@163.com
  • 基金资助:
    国家自然科学基金(32160408);喀什大学高层次人才科研启动经费项目(GCC2023ZK-001)

Isolation and growth-promoting characteristics of rhizobacteria producing indole-3-acetic acid from the rhizosphere soil of Kalidium foliatum

Xin-yu CHENG1,2(), Ji-lian WANG1,2, Mairiyangu·Yasheng1,2, Ming-yuan LI1,2()   

  1. 1.Department of Biologic and Geographic Sciences,Kashi University,Kashi 844006,China
    2.Key Laboratory of Biological Resources and Ecology of Pamirs Plateau in Xinjiang Uygur Autonomous Region,Kashi 844006,China
  • Received:2023-06-23 Revised:2023-08-28 Online:2024-04-20 Published:2024-01-15
  • Contact: Ming-yuan LI

摘要:

为丰富具有产吲哚-3-乙酸(IAA)功能的植物根际促生菌(PGPR),开发高效微生物菌肥,从南疆克孜勒苏柯尔克孜自治州耐盐植物盐爪爪根际土壤中分离产IAA的菌株。结合16S rDNA的限制性片段长度多态性PCR技术(PCR-RFLP)与16S rDNA序列分析进行菌种鉴定,分析高产IAA菌株对玉米和小麦种子发芽的影响,并通过盆栽试验验证其对盐碱胁迫下植株幼苗生长(株高、茎粗、地上干重等)的影响。结果表明,共筛选到67株PGPR菌株,其分泌IAA能力为16.65~71.63 mg·L-1,尤以PM14、PM18分泌量较高。PM14和PM18菌株同时兼具解磷、固氮能力。所有菌株分属6个菌属,以肠杆菌属占绝对优势。接种PM14和PM18均促进了玉米和小麦种子萌发,但菌液浓度高低对种子发芽的影响有显著差异(P<0.05)。接种处理增加了玉米株高、鲜重、地上干重、茎粗和根干重,分别增加了4.7%~37.2%、28.8%~94.5%、15.8%~157.9%、4.4%~35.5%和23.5%~82.4%,但叶绿素含量无显著变化。接种处理增加了小麦株高、茎粗、鲜重和地上干重,分别增加了9.5%~33.1%、13.0%~49.6%、57.4%~112.8%和71.4%~114.3%。除接种灭活的PM14导致小麦根干重与对照相比无显著差异,其他处理均有积极作用,提高了52.8%~69.0%,而所有处理对叶绿素含量均无显著影响。综上,本研究筛选的产IAA菌株提高了植株在盐碱胁迫下的抗性,对开发适用于盐碱地区的微生物菌肥有重要意义。

关键词: 吲哚-3-乙酸, 植物根际促生菌, 盐碱胁迫, 促生, 微生物菌肥

Abstract:

Plant growth-promoting rhizobacteria that are able to produce indole-3-acetic acid (IAA) are useful for the development of high-efficiency microbial fertilizers. In this study, IAA-producing rhizobacteria were isolated from the rhizosphere soil of Kalidium foliatum growing in the Kizilsu Kirgiz Autonomous Prefecture of Xinjiang by culturing on selection media. The isolates were identified on the basis of 16S rDNA PCR-restriction fragment length polymorphisms and their 16S rDNA gene sequences. The effects of strains with a strong ability to produce IAA on the germination of maize and wheat seeds were determined. Furthermore, their effects on the growth of maize and wheat seedlings (plant height, stem diameter, aboveground dry weight) under saline-alkali stress were verified in pot experiments. A total of 67 isolates were screened, and their IAA production capacity ranged from 16.65 to 71.63 mg·L-1. Among all the strains, PM14 and PM18 showed the highest IAA production capacity. In addition, strains PM14 and PM18 were capable of phosphorus solubilization and nitrogen fixation. On the basis of 16S rDNA gene sequence and phylogenetic analyses, the isolates were divided into six genera, of which Enterobacter was the dominant genus. Both PM14 and PM18 promoted seed germination, but there were significant differences in the promoting effect on seed germination between low- and high-concentration groups (P<0.05). After inoculation with PM14 or PM18, the plant height, fresh weight, aboveground dry weight, stem diameter, and root dry weight of maize seedlings were increased by 4.7%-37.2%, 28.8%-94.5%, 15.8%-157.9%, 4.4%-35.5%, and 23.5%-82.4%, respectively, but there was no significant effect on chlorophyll content. The plant height, stem diameter, fresh weight and aboveground dry weight of wheat seedlings were increased by 9.5%-33.1%, 13.0%- 49.6%, 57.4%-112.8%, and 71.4%-114.3%, respectively, after inoculation with PM14 or PM18. Except for an inactivated culture of PM14, all other treatments had positive effects on root dry weight, with increases ranging from 52.8% to 69.0%. However, none of the treatments significantly affected chlorophyll content. In summary, IAA-producing plant growth-promoting rhizobacteria improved the resistance of wheat and maize plants to salt-alkali stress, which is of great significance for the development of microbial fertilizers suitable for cultivating crops in salt- and alkali-affected areas.

Key words: indole-3-acetic acid (IAA), plant growth-promoting rhizobacteria (PGPR), saline-alkali stress, growth-promoting effects, microbial fertilizer