کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10840554 | 1067713 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Modulation of carotenoid biosynthesis during tomato fruit ripening through phytochrome regulation of phytoene synthase activity
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The accumulation of carotenoids greatly influences the quality of ripe tomato (Solanum lycopersicum) fruit because these compounds contribute to their color and functional food value. The regulatory properties and gene expression of phytoene synthase (PSY), a key enzyme involved in carotenoid biosynthesis, was analyzed in tomato fruit. PSY activity was detected in the soluble fraction showing a time- and a protein-dependent increase in the formation of phytoene from geranylgeranyl pyrophosphate (GGPP). The enzyme was stimulated by Mg2+ and ATP, and was inhibited by Tween 20 and Triton X-100. The enzyme followed typical Michaelis-Menten kinetics with increasing GGPP. During in vivo studies, pericarp discs from breaker stage tomatoes were ripened in darkness (D), or D interrupted by daily pulses of red (R) light, or R followed by far red (FR) light. After 14 days incubation, R-treated discs had accumulated 12Â mg carotenoids/100 g fresh weight; nearly a 50% increase over D- and R/FR-treated discs. This R/FR reversibility of carotenoid accumulation was also observed in PSY activity 8Â days post breaker, where it showed peak activity. However, this R/FR regulation of PSY activity was not reflected in PSY1 transcript levels, suggesting that PSY may be subject to post-translational regulation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Plant Physiology and Biochemistry - Volume 43, Issue 12, December 2005, Pages 1052-1060
Journal: Plant Physiology and Biochemistry - Volume 43, Issue 12, December 2005, Pages 1052-1060
نویسندگان
Andrew Schofield, Gopinadhan Paliyath,