Abstract
Carotenoids serve diverse functions in vastly different organisms that both produce and consume them. Enhanced carotenoid accumulation is of great importance in visual and functional properties of fruits and vegetables. Significant progress has been achieved in the understanding of carotenoid biosynthesis in tomato (Solanum lycopersicum) by using biochemical and genetics approaches in recent years. Carotenoid metabolic network is temporally and spatially controlled, and plants have evolved strategic tactics to regulate carotenoid metabolism in response to various developmental and environmental factors. Here in this review, we summarize current status of studies on transcription factors and phytohormones that regulate carotenoid biosynthesis, catabolism, and storage capacity in plastids, as well as the responses of carotenoid metabolism to environmental cues in tomato fruits. Transcription factors function either in cooperation with or independent of phytohormone signaling, which provides novel approaches for metabolic engineering of carotenoid composition and content.
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