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

The Korean Society of Grassland and Forage Science (한국초지조사료학회)
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Drought Tolerance in Italian Ryegrass is Associated with Genetic Divergence, Water Relation, Photosynthetic Efficiency and Oxidative Stress Responses

  • Lee, Ki-Won (Grassland & Forages Division, National Institute of Animal Science, RDA) ;
  • Woo, Jae Hoon (Grassland & Forages Division, National Institute of Animal Science, RDA) ;
  • Song, Yowook (Grassland & Forages Division, National Institute of Animal Science, RDA) ;
  • Lee, Sang-Hoon (Grassland & Forages Division, National Institute of Animal Science, RDA) ;
  • Rahman, Md Atikur (Grassland & Forages Division, National Institute of Animal Science, RDA)
  • Received : 2022.09.20
  • Accepted : 2022.09.27
  • Published : 2022.09.30
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Abstract

Drought stress is a condition that occurs frequently in the field, it reduces of the agricultural yield of field crops. The aim of the study was to screen drought-adapted genotype of Italian rye grass. The experiments were conducted between the two Italian ryegrass (Lolium multiflorum L.) cultivars viz. Hwasan (H) and Kowinearly (KE). The plants were exposed to drought for 14 days. The results suggest that the morphological traits and biomass yield of KE significantly affected by drought stress-induced oxidative stress as the hydrogen peroxide (H2O2) level was induced, while these parameters were unchanged or less affected in H. Furthermore, the cultivar H showed better adaptation by maintaining several physiological parameter including photosystem-II (Fv/Fm), water use efficiency (WUE) and relative water content (RWC%) level in response to drought stress. These results indicate that the cultivar H shows improved drought tolerance by generic variation, improving photosynthetic efficiency and reducing oxidative stress damages under drought stress. These findings can be useful to the breeder and farmer for improving drought tolerance in Italian rye grass through breeding programs.

Keywords

Acknowledgement

This study was partially funded by the Cooperative Research Program for Agriculture Science & Technology Development (Project No. PJ01669901). This work was also supported by the Postdoctoral Fellowship Program of the National Institute of Animal Science funded by RDA, Republic of Korea.

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