Affiliation:
1. Department of Applied Biosciences, Kyungpook National University, Daegu 41566, Republic of Korea
2. Institute of Agricultural Science and Technology, Kyungpook National University, Daegu 41566, Republic of Korea
3. National Institute of Crop Science, Rural Development Administration, Wanju 55365, Republic of Korea
Abstract
Drought has severely impacted worldwide agricultural land, resulting in substantial yield loss and abiotic pressures in crops such as Chinese cabbage. Paclobutrazol (PBZ) and plant growth-stimulating bacteria have been extensively recommended to reduce a variety of stresses in crops. Considering these facts, we used PBZ and rhizobacterium Variovorax sp. YNA59, a microbe with potential plant growth-stimulating qualities, in Chinese cabbage under drought stress and non-stressed conditions, and we observed their impacts on morphological and physiological attributes. Our findings revealed a considerable improvement in total plant biomass growth after treatment with YNA59 (28%) and PBZ (8%) under drought conditions. In contrast, negative results of PBZ were observed under normal conditions, suppressing plant growth and reducing plant biomass. The increase in physiological parameters, such as chlorophyll content, relative water content, and photochemical efficiencies of PS II, were observed in YNA59-treated plants, followed by PBZ, especially under drought. Furthermore, drought stress significantly increased the endogenous phytohormone abscisic acid level, whereas PBZ and YNA59 inoculations significantly decreased it. Antioxidant analysis revealed that PBZ and YNA increased glutathione and catalase and decreased polyphenol oxidase and peroxidase levels. These findings suggested that rhizobacterium YNA59 could be more significant for conferring water stress in the Chinese cabbage plant than PBZ.
Funder
National Research Foundation of Korea (NRF) funded by the Ministry of Education
Subject
Microbiology (medical),Molecular Biology,Microbiology
Reference68 articles.
1. Matiu, M., Ankerst, D.P., and Menzel, A. (2017). Interactions between temperature and drought in global and regional crop yield variability during 1961–2014. PLoS ONE, 12.
2. Global patterns of crop production losses associated with droughts from 1983 to 2009;Kim;J. Appl. Meteorol. Climatol.,2019
3. Factors affecting food security and contribution of modern technologies in food sustainability;Premanandh;J. Sci. Food Agric.,2011
4. Plant growth regulators and salt stress: Mechanism of tolerance trade-off;Fariduddin;Salt Stress Microbes Plant Interact. Causes Solut.,2019
5. The Combined Inoculation of Curvularia lunata AR11 and Biochar Stimulates Synthetic Silicon and Potassium Phosphate Use Efficiency, and Mitigates Salt and Drought Stresses in Rice;Adhikari;Front. Plant Sci.,2022