Stress Responses of Shade-Treated Tea Leaves to High Light Exposure after Removal of Shading
| Autor: | Kengo Suzuki, Tetsuyuki Takemoto, Shigeto Morita, Akira Ogihara, Takehiro Masumura, Shigeru Satoh, Satoshi Sano, Yutaka Mimura, Kazufumi Takano |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
tea Antioxidant medicine.medical_treatment Plant Science medicine.disease_cause 01 natural sciences Article Camellia sinensis Fight-or-flight response 03 medical and health sciences lcsh:Botany medicine oxidative stress shading treatment health care economics and organizations Ecology Evolution Behavior and Systematics 030304 developmental biology Light exposure 0303 health sciences high light Ecology Chemistry fungi food and beverages Protein level social sciences Green tea camellia sinensis covering culture humanities lcsh:QK1-989 Horticulture Shading Oxidative stress 010606 plant biology & botany |
| Zdroj: | Plants, Vol 9, Iss 3, p 302 (2020) Plants Volume 9 Issue 3 |
| ISSN: | 2223-7747 |
| Popis: | High-quality green tea is produced from buds and young leaves grown by the covering-culture method, which employs shading treatment for tea plants (Camellia sinensis L.). Shading treatment improves the quality of tea, but shaded tea plants undergo sudden exposures to high light (HL) at the end of the treatment by shade removal. In this study, the stress response of shaded tea plants to HL illumination was examined in field condition. Chl a/b ratio was lower in shaded plants than nonshaded control, but it increased due to exposure to HL after 14 days. Rapid decline in Fv/Fm values and increases in carbonylated protein level were induced by HL illumination in the shaded leaves on the first day, and they recovered thereafter between a period of one and two weeks. These results revealed that shaded tea plants temporarily suffered from oxidative damages caused by HL exposure, but they could also recover from these damages in 2 weeks. The activities of antioxidant enzymes, total ascorbate level, and ascorbate/dehydroascorbate ratio were decreased and increased in response to low light and HL conditions, respectively, suggesting that the upregulation of antioxidant defense systems plays a role in the protection of the shaded tea plants from HL stress. |
| Databáze: | OpenAIRE |
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