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Advances in Photosynthesis Fundamental Aspects Part 4

Tham khảo tài liệu 'advances in photosynthesis fundamental aspects part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 82 Advances in Photosynthesis - Fundamental Aspects burst in the production of carotenoids in coordination with chlorophyll biosynthesis and chloroplast development leading to an optimal transition to the photosynthetic metabolism Toledo-Ortiz et al. 2010 . B CYTOPLASM y CHLOROPHYLL BIOSYNTHESIS CAROTENOID BIOSYNTHESIS Fig. 2. Ligh-mediated activation of the signal transduction involved in photomorphogenesis in plants. The transition from dark conditions A to light conditions B allows the photosynthetic metabolism. Abbreviations activated phytochromoe PHY-Pr cryptochrome 1 CRY1 transcription factor LONG HYPOCOTYL 5 HY5 constitutive photomorphogenic 1 COP1 phytochrome interacting factor PIF1 light response element LRE . Microarray transcriptome analysis during seedling deetiolation indicated that the majority of the gene expression changes elicited by the absence of the PIFs in dark grown pifq seedlings pif1 pif3 pif4 pif5 quadruple mutants are normally induced by prolonged light in wild-type seedlings such as the induction of numerous photosynthetic genes related to the biogenesis of active chloroplasts auxin gibberellins GA cytokinin and ethylene hormone pathway-related genes potentially mediating growth responses and metabolic genes involved in the transition from heterotrophic to autotrophic growth. Besides other functions associated with PIFs have been described as i regulating seed germination dormant Arabidopsis seeds require both light activation of the phytochrome system and cold treatment stratification to induce efficient germination. PIF1 repress germination in the dark and exerts this function at least in part by repressing the Carotenoids and Photosynthesis - Regulation of Carotenoid Biosyntesis by Photoreceptors 83 expression of the key GA-biosynthetic genes GA3ox1 and GA3ox2 and promoting the expression of the GA catabolic genes. PIF1 also promotes the expression of the abscisic acid ABA -biosynthetic genes and represses the expression of the ABA .