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Article

Bacillus licheniformis PR2 Controls Fungal Diseases and Increases Production of Jujube Fruit under Field Conditions

1
Department of Forest Resources, College of Agriculture and Life Sciences, Chonnam National University, Gwangju 61186, Korea
2
Division of Forest Special Products, National Institute of Forest Science, Suwon 16631, Korea
3
Institute of Environmentally-Friendly Agriculture, Chonnam National University, Gwangju 61186, Korea
4
Division of Agricultural and Biological Chemistry, Institute of Environmentally-Friendly Agriculture, College of Agriculture and Life Sciences, Chonnam National University, Gwangju 61186, Korea
*
Author to whom correspondence should be addressed.
Jun-Hyeok Kwon and Sang-Jae Won contributed equally to this work.
Academic Editors: Alessandra Francini and Stefania M. Mang
Horticulturae 2021, 7(3), 49; https://doi.org/10.3390/horticulturae7030049
Received: 6 January 2021 / Revised: 8 March 2021 / Accepted: 10 March 2021 / Published: 12 March 2021
(This article belongs to the Special Issue The Effect of Plant Pathogens on Horticultural Plants)
There is a growing interest in using biocontrol agents to control fungal diseases and increase the production of jujube fruit (Zizyphus jujua Miller var. inermis Rehder). The purpose of this study was to use Bacillus licheniformis PR2 to inhibit fungal diseases and promote fruit production in jujube orchards. B. licheniformis PR2 secreted 92.4 unit/mL of chitinase, which inhibited fungal phytopathogens through hyphal alterations with swelling and bulbous structures. B. licheniformis PR2 also inhibited mycelial growths of fruit fungal pathogens Botrytis cinerea, Colletotrichum gloeosporioides, and Phytophthora nicotianae by 81.3%, 60.1%, and 67.0%, respectively. B. licheniformis PR2 increased jujube fruit yield by 17.9 kg/tree by reducing rotting damage caused by fungal pathogens, with a yield 3.2 times higher than that achieved by the control without PR2 treatment. In addition, B. licheniformis PR2 produced auxin, which promoted cell division after flower fertilization, thus increasing fruit length and diameter by 1.2-fold compared to those of the control. These results confirmed that eco-friendly B. licheniformis PR2 could effectively control fungal diseases in jujube orchards and improve its fruit size and yield. View Full-Text
Keywords: antagonistic bacteria; biocontrol agent; lytic enzyme; fungal pathogens; auxin; fruit yield; jujube cultivation antagonistic bacteria; biocontrol agent; lytic enzyme; fungal pathogens; auxin; fruit yield; jujube cultivation
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MDPI and ACS Style

Kwon, J.-H.; Won, S.-J.; Moon, J.-H.; Lee, U.; Park, Y.-S.; Maung, C.E.H.; Ajuna, H.B.; Ahn, Y.S. Bacillus licheniformis PR2 Controls Fungal Diseases and Increases Production of Jujube Fruit under Field Conditions. Horticulturae 2021, 7, 49. https://doi.org/10.3390/horticulturae7030049

AMA Style

Kwon J-H, Won S-J, Moon J-H, Lee U, Park Y-S, Maung CEH, Ajuna HB, Ahn YS. Bacillus licheniformis PR2 Controls Fungal Diseases and Increases Production of Jujube Fruit under Field Conditions. Horticulturae. 2021; 7(3):49. https://doi.org/10.3390/horticulturae7030049

Chicago/Turabian Style

Kwon, Jun-Hyeok, Sang-Jae Won, Jae-Hyun Moon, Uk Lee, Yun-Serk Park, Chaw E.H. Maung, Henry B. Ajuna, and Young S. Ahn 2021. "Bacillus licheniformis PR2 Controls Fungal Diseases and Increases Production of Jujube Fruit under Field Conditions" Horticulturae 7, no. 3: 49. https://doi.org/10.3390/horticulturae7030049

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