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http://dx.doi.org/10.12791/KSBEC.2015.24.3.264

Physiological Responses and Fruit Quality Changes of 'Fuji' Apple under the High Night Temperature  

Ryu, Suhyun (Fruit Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
Kwon, YongHee (Fruit Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
Do, Kyeong Ran (Fruit Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
Han, Jeom Hwa (Fruit Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
Han, Hyun Hee (Fruit Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
Lee, Han Chan (Fruit Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
Publication Information
Journal of Bio-Environment Control / v.24, no.3, 2015 , pp. 264-270 More about this Journal
Abstract
Tropical night phenomenon has been increasing due to global warming recently, it is expected that fruit quality of apples will decrease due to elevated night temperature condition. In the present study, fruit quality at maturity, periodic anthocyanin biosynthetic gene expression and sugar contents in leaves and fruit flesh were investigated to establish the physiological responses of 'Fuji' apples under high night temperature. The night temperature were treated with such as ambient (control), ambient $-4^{\circ}C$, and ambient $+4^{\circ}C$. After the treatment, high night temperature didn't affect fruit diameter, weight, and soluble sugar contents. Coloration of ambient $+4^{\circ}C$ was poor than that of control, however there was no significant difference between these genes expression of control and that of ambient $+4^{\circ}C$ treatment in the late coloration season. Increase of sorbitol and glucose contents at ambient $+4^{\circ}C$ in leaves were smaller than those at control, and then sorbitol and sucrose contents in fruit flesh at ambient $+4^{\circ}C$ were smaller than those at control. The cross section of leaves showed that there were no differences with the structure of parenchyma and epidermis tissues between the treatments, but starch granules in the palisade parenchyma cells decreased in high night temperature treatments. Consequently, high night temperature didn't affect the fruit quality, but changed sugar contents in leaves and fruit flesh, and suppressed coloration regardless of anthocyanin biosynthetic gene expression.
Keywords
sorbitol; anthocyanin; anthocyanin biosynthetic genes; sucrose; glucose;
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