Journal of The Korean Society of Grassland and Forage Science (한국초지조사료학회지)

The Korean Society of Grassland and Forage Science (한국초지조사료학회)
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Phosphorus Significance in Alleviating Oxidative Stress Induced by Drought in Kentucky Bluegrass (Poa pratensis L.)

  • Kim, Dae-Hyun (Department of Animal Science, College of Agriculture & Life Sciences, Chonnam National University) ;
  • Lee, Bok-Rye (Department of Animal Science, College of Agriculture & Life Sciences, Chonnam National University) ;
  • Park, Sang-Hyun (Department of Animal Science, College of Agriculture & Life Sciences, Chonnam National University) ;
  • Kim, Tae-Hwan (Department of Animal Science, College of Agriculture & Life Sciences, Chonnam National University)
  • Received : 2022.06.09
  • Accepted : 2022.06.22
  • Published : 2022.06.30
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Abstract

The objective of this study was to determine phosphorus effects on drought stress-induced oxidative stress in Kentucky bluegrass. Drought stress was induced by reducing of water to plants in pots. Two types of phosphorus were applied as potassium phosphate (P) or potassium phosphonate (PA). Application of phosphorus was efficient to ameliorate the adverse effects of drought. Osmotic potential, total chlorophyll and carotenoid content were significantly decreased by drought stress, but was relieved by P or PA application. Superoxide (O2•-) concentration was significantly increased more than 14-fold under drought-stressed plants, was accompanied with increase of hydrogen peroxide (H2O2) and lipid peroxidation (MDA). However, malondialdehyde (MDA) was much less in P or PA applied plants under drought stress condition. Activities of catalase (CAT), ascorbate peroxidase (APX) and guaiacol-peroxidase (GPX) were largely increased by drought stress and its increase rate was much higher in P or PA applied plants except APX. These results indicate that drought stress-induced oxidative stress is alleviated by P or PA application due to the increase of activities of antioxidant enzymes.

Keywords

Acknowledgement

This study was revised the contents of Dae-Huyn Kim (2016)'s Chonnam National University Doctoral Dissertation Thesis "Characterization of physiological responses to abiotic stress or biotic stress and possible approach for improving stress tolerance in turfgrasses".

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