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

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 si...

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Published inMicroorganisms (Basel) Vol. 7; no. 3; p. 82
Main Authors Natsagdorj, Oyungerel, Sakamoto, Hisayo, Santiago, Dennis Marvin O, Santiago, Christine D, Orikasa, Yoshitake, Okazaki, Kazuyuki, Ikeda, Seishi, Ohwada, Takuji
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LanguageEnglish
Published Switzerland MDPI AG 15.03.2019
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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 L. ( sp. HRRK 005, sp. HRRK 103, sp. HRRK 170, sp. HRRK 190, sp. HRTK 192, and 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.
AbstractList 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.
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.
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 L. ( sp. HRRK 005, sp. HRRK 103, sp. HRRK 170, sp. HRRK 190, sp. HRTK 192, and 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.
Author Ikeda, Seishi
Orikasa, Yoshitake
Sakamoto, Hisayo
Natsagdorj, Oyungerel
Santiago, Christine D
Ohwada, Takuji
Santiago, Dennis Marvin O
Okazaki, Kazuyuki
AuthorAffiliation 2 Department of Life and Food Science, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan; hisayosakamoto.com@gmail.com
5 Hokkaido Agricultural Research Center, National Agriculture and Food Research Organization, 9-4 Shinsei-minami, Memuro-cho, Kasai-gun, Hokkaido 082-0081, Japan; okakazu@affrc.go.jp (K.O.); sikeda67@affrc.go.jp (S.I.)
4 Department of Science and Technology Philippines-Philippine Council for Agriculture, Aquatic and Natural Resources Research and Development, Los Baños, Laguna 4030, Philippines; christinesantiago_1017@yahoo.com
1 United Graduate School of Agricultural Sciences, Iwate University, 18-8 Ueda-sanchome, Morioka, Iwate 020-8550, Japan; oyungereln@ymail.com (O.N.); yosori@obihiro.ac.jp (Y.O.)
3 Institute of Food Science and Technology, College of Agriculture and Food Science, University of the Philippines Los Baños, Laguna 4031, Philippines; dosantiago1@up.edu.ph
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Keywords Variovorax
GUS staining
plant growth-promoting bacteria
bioinoculant
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StartPage 82
SubjectTerms Agriculture
Bacteria
Biochemical tests
Biofilms
bioinoculant
Carboxylic acids
Cell density
Chinese cabbage
Clean technology
Colonization
Enzymes
Fisheries
GUS staining
Microorganisms
Plant growth
Plant growth promoters
Plant growth substances
plant growth-promoting bacteria
Plant roots
Roots
Seedlings
Siderophores
Sustainable agriculture
Variovorax
Vegetables
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Title Variovorax sp. Has an Optimum Cell Density to Fully Function as a Plant Growth Promoter
URI https://www.ncbi.nlm.nih.gov/pubmed/30875976
https://www.proquest.com/docview/2548997156
https://search.proquest.com/docview/2193163225
https://pubmed.ncbi.nlm.nih.gov/PMC6462933
https://doaj.org/article/bd75531a11ea41c8a57c92d53e8ca633
Volume 7
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