Drought Tolerance in Italian Ryegrass is Associated with Genetic Divergence, Water Relation, Photosynthetic Efficiency and Oxidative Stress Responses

서지정보

ㆍ발행기관 : 한국초지조사료학회 ㆍ수록지정보 : 한국초지조사료학회지 / 42권 / 3호
ㆍ저자명 : Ki-Won Lee, Jae Hoon Woo, Yowook Song, Sang-Hoon Lee, Md Atikur Rahman

목차

ABSTRACT
Ⅰ. INTRODUCTION
Ⅱ. MATERIALS AND METHODS
1. Plant growth and drought treatment
2. Analysis of morphological and photosynthetic parameters
3. Measurement of water use efficiency and relativewater content
4. Determination of hydrogen peroxide
5. Measurement of malondialdehyde(MDA) accumulation
6. Statistical analysis
Ⅲ. RESULTS AND DISCUSSION
1. Drought stress-induced morphological variationsbetween the genotypes
2. Variation of WUE, RWC, and photosynthesis
3. Regulation of drought-induced oxidative stress indicators
Ⅳ. CONCLUSION
Ⅴ. ACKNOWLEDGEMENTS
Ⅵ. REFERENCES

영어 초록

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.

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