Next Article in Journal
The Production and Delivery of Probiotics: A Review of a Practical Approach
Next Article in Special Issue
In Vitro Activation of Seed-Transmitted Cultivation-Recalcitrant Endophytic Bacteria in Tomato and Host–Endophyte Mutualism
Previous Article in Journal
Supercoil Levels in E. coli and Salmonella Chromosomes Are Regulated by the C-Terminal 35–38 Amino Acids of GyrA
Previous Article in Special Issue
Root-Associated Endophytic Bacterial Community Composition of Pennisetum sinese from Four Representative Provinces in China
Article Menu
Issue 3 (March) cover image

Export Article

Open AccessArticle

Variovorax sp. Has an Optimum Cell Density to Fully Function as a Plant Growth Promoter

1
United Graduate School of Agricultural Sciences, Iwate University, 18-8 Ueda-sanchome, Morioka, Iwate 020-8550, Japan
2
Department of Life and Food Science, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
3
Institute of Food Science and Technology, College of Agriculture and Food Science, University of the Philippines Los Baños, Laguna 4031, Philippines
4
Department of Science and Technology Philippines-Philippine Council for Agriculture, Aquatic and Natural Resources Research and Development, Los Baños, Laguna 4030, Philippines
5
Hokkaido Agricultural Research Center, National Agriculture and Food Research Organization, 9-4 Shinsei-minami, Memuro-cho, Kasai-gun, Hokkaido 082-0081, Japan
*
Author to whom correspondence should be addressed.
Microorganisms 2019, 7(3), 82; https://doi.org/10.3390/microorganisms7030082
Received: 18 February 2019 / Revised: 6 March 2019 / Accepted: 13 March 2019 / Published: 15 March 2019
(This article belongs to the Special Issue Plant Control of Symbiotic Microbe Behavior and Reproduction)
  |  
PDF [10589 KB, uploaded 15 March 2019]
  |  

Abstract

Utilization of plant growth-promoting bacteria colonizing roots is environmentally friendly technology instead of using chemicals in agriculture, and understanding of the effects of their colonization modes in promoting plant growth is important for sustainable agriculture. We herein screened the six potential plant growth-promoting bacteria isolated from Beta vulgaris L. (Rhizobium sp. HRRK 005, Polaromonas sp. HRRK 103, Variovorax sp. HRRK 170, Mesorhizobium sp. HRRK 190, Streptomyces sp. HRTK 192, and Novosphingobium sp. HRRK 193) using a series of biochemical tests. Among all strains screened, HRRK 170 had the highest potential for plant growth promotion, given its ability to produce plant growth substances and enzymes such as siderophores and 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase, respectively, concomitantly with active growth in a wider range of temperatures (10–30 °C) and pH (5.0–10.0). HRRK 170 colonized either as spots or widely on the root surface of all vegetable seedlings tested, but significant growth promotion occurred only in two vegetables (Chinese cabbage and green pepper) within a certain cell density range localized in the plant roots. The results indicate that HRRK 170 could function as a plant growth promoter, but has an optimum cell density for efficient use. View Full-Text
Keywords: plant growth-promoting bacteria; Variovorax; bioinoculant; GUS staining plant growth-promoting bacteria; Variovorax; bioinoculant; GUS staining
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Natsagdorj, O.; Sakamoto, H.; Santiago, D.M.O.; Santiago, C.D.; Orikasa, Y.; Okazaki, K.; Ikeda, S.; Ohwada, T. Variovorax sp. Has an Optimum Cell Density to Fully Function as a Plant Growth Promoter. Microorganisms 2019, 7, 82.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Microorganisms EISSN 2076-2607 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top