The absolute configuration of ceriporic acids, their stereoselective biosynthetic pathway and the diversity of their metabolites have been largely discussed ().
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Steinbrenner J, Linden H (2003) Light induction of carotenoid biosynthesis genes in the green alga : regulation by photosynthetic redox control. Plant Molecular Biology 52, 343–356.
Regulation of carotenoid formation during tomato fruit …
Abstract. Expression of the carotenoid biosynthesis genes PDS and PSY during development of tomato plants was studied by reverse transcriptase-polymerase chain reaction (RT-PCR). Results indicate that both stress and developmental signals control the expression of these genes. The PDS was mapped to the chromosome 3 of tomato.
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Scanty information is available about the molecular mechanism which is responsible of modulation in transcript expression of carotenoid pathways genes under salt stress condition. Therefore, differential study of carotenoid in capsicum varieties with various level of salt sensitivity may lead to better understanding about transcript regulation under salt stress. For this purpose we selected five major carotenoid genes phyotene synthetase (PSY), phytoene desaturase (PDS), zetacarotene desaturase (ZCD), lycopene β-cyclase (LCY-β) and Capsanthin/Capsorubin Synthase (CCS). This study aims to advance a better apprehension of the regulation of carotenoid biosynthesis in at the molecular levels under salt stress condition for this function, we have selected three capsicum salt tolerant (G4), moderate tolerant (K2) and salt sensitive (CO1) with various salt sensitivity levels. In this report, capsicum seedlings were used to address mainly 4 questions
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dose-dependently plays important roles in the growth and development processes of plants. These include exercising a thermogenic effect (Raskin ., 1989), stimulating adventive root development (Kling and Meyer, 1983), showing a herbicidal effect (Shettel and Blake, 1983), reducing leaf shedding (Ferrarese ., 1996), providing resistance against pathogens (Salisbury and Ross, 1992), inhibiting ethylene biosynthesis (Carswel ., 1989), modifying the quality and quantity of proteins (Jung ., 1993; Mersie and Singh, 1993; Çanakci, 2003) and providing endurance against stress (Ágnes ., 2005; Rajasekaran ., 2001; Adalberto ., 2002; Senaratna ., 2000). Such examples and many other phenomena caused by SA suggested to some researchers that this substance could be another plant growth regulator (Raskin ., 1989; Raskin, 1995; Losanka ., 1997; Rajasekaran and Blake, 1999).
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But there's more to this story. By soaking up free radicals and shining up the biochemical environment in our bodies, antioxidants make DNA transcription possible. Remember that DNA makes proteins, and proteins run the body (neurotransmitters, enzymes, hormones, the physical structure, the works.) DNA does this first by transcribing itself to RNA; the RNA then attracts and lines the amino acids up in the right order to make the protein. This only happens in a cellular environment clean of free radicals.2,3,4 By soaking up free radicals and cleaning up the environment, antioxidants help the regulation and expression of our genetic inheritance. Antioxidants create the right atmosphere for our bodies to do business.