UV-B-Induced Changes in Carbohydrate Content and Antioxidant Activity in Rice Seedling

• 발행기관: 한국작물학회
• 저자명: 성좌경(JWAKYUNG SUNG) 이수연(lee su yeon) 박소현(Park So-hyun) 송범헌(Song, Beom-Heon) 장병춘(JANG BYOUNG CHOON) Sang-Min Lee Yong-Hwan Lee Du-Hoi Choi
• 간행물 정보: 『한국작물학회지』제50권 제2호, 84~90쪽, 전체 7쪽
• 주제분류: 농수해양 > 기타농수해양
• 파일형태: PDF
• 발행일자: 2005.06.30

영문 초록

The effects of UV-B radiation on the seedling growth, carbohydrate metabolism and antioxidants activities of rice (Oryza sativa L.) were investigated under environmentally controlled chamber. Supplementary UV-B radiation reduced dry matter as well as leaf area, therefore, relative growth rates (RGR) of seedlings were decreased by up to half compared to control. Photosynthetic products such as soluble sugars and starch were rapidly and significantly reduced by within 1 day of enhanced UV-B radiation due to the inhibition and degradation of photosynthetic processes and thylakoid membrane integrity. In our study, nonstructural carbohydrate levels were proved to be a main indicator on UV-B-induced stress. The behavior of SOD, CAT, APX and POD activities was monitored in the leaves of rice seedlings subjected to UV-B radiation. Under UV-B treatments, SOD activity was initially increased, whereas CAT and POD activities were slowly and slightly increased. However, APX activity showed no presumable results with an increase of UV-B dose. In leaves of rice seedlings, supplementary UV-B radiation caused an increase in free putrescine and spermidine, however spermine remained unaltered, although 24-hrs UV-B treatment slightly increased. This result presumes that an excess UV-B dose may induce ethylene biosynthesis (senescence) rather than polyamine biosynthesis (defense).

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키워드

UV-B rice carbohydrate antioxidant enzymes polyamines