Article | 10. 2016 Vol. 34, Issue. 5
Gene Expression as Related to Ripening in High Temperature during Different Coloration Stages of ‘Haryejosaeng’ and ‘Shiranuhi’ Mandarin Fruits

Department of Horticulture and Life Science, Yeungnam University1
Citrus Research Institute, National Institute of Horticultural & Herbal Science2

2016.10. 665:676


As high temperature during citrus growing season has caused a serious problems including inferior coloration in production of mandarins in Korea, we were to investigate the expression pattern of several genes related with coloration during the ripening in high temperature condition of citrus fruits. The expression of genes related with sugar metabolism, cell wall degradation, and flavonoid synthesis in high temperature conditions was investigated in fruits of ‘Haryejosaeng’ (Citrus unshiu) and ‘Shiranuhi’ mandarin (C. reticulata). While the expression of beta-amylase (BMY ), phenylalanine ammonia-lyase (PAL), chalcone synthase (CHS), and flavanone 3-hydroxylase (F3H ) was differently induced, expression of polygalacturonase (PG) decreased dependently on temperature conditions. In ‘Haryejosaeng’ mandarin, while the expression of genes related to the skin coloration, such as CHS and F3H genes increased at 25°C, the expression of PAL and stilbene synthase (STS ) genes were induced at 30-35°C in all ripening stages. In ‘Shiranuhi’ mandarin, the expression of the BMY gene decreased at early time point in all temperature condition and then increased at 30-35°C than at 25°C in the ripening stage 2 to 3 of fruits. F3H and STS genes also showed the tendency to decrease at 30-35°C. Although the expression levels of genes in ripening stage 1 and stage 2 of fruits showed similar patterns in both ‘Haryejosaeng’ and ‘Shiranuhi’, the expression levels of genes were down-regulated in late ripening stage of ‘Shiranuhi’ fruits compared to ‘Haryejosaeng’. In general, the mRNA levels of seven tested genes were higher in ‘Haryejosaeng’ than in ‘Shiranuhi’ mandarin, and expression of genes by high temperature was regulated sensitively in ‘Haryejosaeng’ compared to ‘Shiranuhi’ mandarin. Further investigations of expression of various genes based on transcriptome analysis in early ripening stage can provide valuable information about the responses to climatic changes in ripening citrus fruits.

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