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Integrated transcriptomics and metabolomics analyses reveal the molecular mechanisms of red-light on carotenoids biosynthesis in tomato fruit

类胡萝卜素 番茄红素 龙葵 生物合成 生物 八氢番茄红素合酶 生物化学 采后 植物烯 植物 食品科学 基因
作者
Jun Tang,Yan Li,Zhongliang Liu,Min Wei,Qinghua Shi,Fengjuan Yang
出处
期刊:Food Quality and Safety [Oxford University Press]
卷期号:6 被引量:16
标识
DOI:10.1093/fqsafe/fyac009
摘要

Abstract Carotenoids are the main pigments responsible for the coloration and account for the major antioxidant activity of tomato (Solanum lycopersicum L.) fruit. Significant increments in total carotenoids and lycopene levels were observed in tomato fruit illuminated by red light relative to white light in previous studies, but the mechanism of carotenoid biosynthesis regulated by red light is still unclear. In the present study, the influence of red light on carotenoid biosynthesis in postharvest tomato fruit was conducted using targeted metabolomics and transcriptomic methods. A total of 25 differentially accumulated carotenoids and 1939 differentially expressed genes were isolated and identified. The results illustrated that the contents of phytoene and lycopene were considerably higher in fruit treated with red light than those with white light at 12 h. These differentially expressed genes are mainly enriched in plant hormone signal transduction, photosynthesis, secondary metabolite biosynthesis, and plant circadian rhythm. Moreover, from the results of coexpression network analysis, 15 transcription factors from red light-treated fruit were screened; among these, transcription factors of SlERF4, SlbHLH93 and SlIAA29, which are involved in signal transduction of light and hormones, respectively, may also play important roles in carotenoid biosynthesis regulated by red light in tomato fruit. It is concluded that red light enhanced carotenoid biosynthesis in postharvest tomato fruit and the mechanisms of enhanced carotenoid biosynthesis were not only associated with the direct regulation by red light signalling, but also with the indirect regulation by hormonal signalling.
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