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

The Korean Society of Grassland and Forage Science (한국초지조사료학회)
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Impacts of Phosphorus on Lignification and Carbohydrate Metabolism in Relation to Drought Stress Tolerance 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 effects of phosphorus on lignification and carbohydrate metabolism in Kentucky bluegrass under drought stress. Drought stress was induced by reducing of water to plants in pots. Two types of phosphorus were applied as potassium phosphate (PO43-; P) or potassium phosphonate (PO33-; PA) in drought-stressed plants. Drought had significant negative effects on plant growth, as revealed by reduced biomass of shoot. Drought-induced increase of lignin content was concomitant with the increase of phenylalanine ammonia-lyase (PAL). Soluble sugar content was highly increased but fructan content was largely decreased by drought stress. However, the application of phosphorus was efficient to ameliorate the adverse effects of drought. PA application improved reduced shoot growth and relative water content, and inhibited lignification synthesis with a reduction of PAL activity. P or PA application maintained soluble sugar and fructan content at similar levels to controls under drought stress. These results indicate that phosphorus application may mitigate the drought stress by inhibiting the lignification and promoting the fructan assimilation.

Keywords

Acknowledgement

This study was partially 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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