antheraxanthin/nicotiana

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Suppression of zeaxanthin formation does not reduce photosynthesis and growth of transgenic tobacco under field conditions.

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Tobacco (Nicotiana tabacum cv. Xanthi) transformed with an antisense cDNA construct of violaxanthin de-epoxidase (VDE) was examined for the effects of suppressed xanthophyll-cycle activity on photoinhibition, photosynthesis and growth under field conditions. De-epoxidation of violaxanthin and

Transgenic tobacco with suppressed zeaxanthin formation is susceptible to stress-induced photoinhibition.

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Tobacco (Nicotiana tabacum cv. Xanthi) transformed with the antisense construct of tobacco violaxanthin de-epoxidase was analyzed for responses in growth chambers to both short and long-term stress treatments. Following a short-term (2 or 3 h) high-light treatment, antisense plants had a greater

Developmental expression of violaxanthin de-epoxidase in leaves of tobacco growing under high and low light.

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Violaxanthin de-epoxidase (VDE) is a lumen-localized enzyme that catalyzes the de-epoxidation of violaxanthin in the thylakoid membrane upon formation of a transthylakoid pH gradient. We investigated the developmental expression of VDE in leaves of mature tobacco (Nicotiana tabacum) plants grown

Violaxanthin Cycle Pigment Contents in Potato and Tobacco Plants with Genetically Reduced Photosynthetic Capacity.

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The influence of photosynthetic activity on the light-dependent adaptation of the pool size of the violaxanthin cycle pigments (violaxanthin + antheraxanthin + zeaxanthin) was studied in leaves of wild-type and transgenic potato (Solanum tuberosum L.) and tobacco (Nicotiana tabacum L.) plants. The

Overexpression of violaxanthin de-epoxidase: properties of C-terminal deletions on activity and pH-dependent lipid binding.

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Violaxanthin de-epoxidase (VDE) is localized in the thylakoid lumen and catalyzes the de-epoxidation of violaxanthin to form antheraxanthin and zeaxanthin. VDE is predicted to be a lipocalin protein with a central barrel structure flanked by a cysteine-rich N-terminal domain and a glutamate-rich

Nicotiana glauca engineered for the production of ketocarotenoids in flowers and leaves by expressing the cyanobacterial crtO ketolase gene.

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Nicotiana glauca is a tobacco species that forms flowers with carotenoid-pigmented petals, sepals, pistil, ovary and nectary tissue. The carotenoids produced are lutein, ss-carotene as well as some violaxanthin and antheraxanthin. This tobacco species was genetically modified for ketocarotenoid

Abscisic acid biosynthesis in roots : I. The identification of potential abscisic acid precursors, and other carotenoids.

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The pathway of water-stress-induced abscisic acid (ABA) biosynthesis in etiolated and light-grown leaves has been elucidated (see A.D. Parry and R. Horgan, 1991, Physiol. Plant. 82, 320-326). Roots also have the ability to synthesise ABA in response to stress and it was therefore of interest to

Responses of the xanthophyll cycle pool and ascorbate-glutathione cycle to ozone stress in two tobacco cultivars.

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Plants of Nicotiana tabacum (O3-tolerant cv Bel-B and O3-sensitive cv Bel-W3) were exposed to 150 ppb of ozone for 5 h; the fumigation produced visual injury in mature leaves, particularly in Bel-W3. After O3-treatment the pigments of the xanthophyll cycle pool decreased in both cvs, with a strong

A functional zeaxanthin epoxidase from red algae shedding light on the evolution of light-harvesting carotenoids and the xanthophyll cycle in photosynthetic eukaryotes.

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The epoxy-xanthophylls antheraxanthin and violaxanthin are key precursors of light-harvesting carotenoids and participate in the photoprotective xanthophyll cycle. Thus, the invention of zeaxanthin epoxidase (ZEP) catalyzing their formation from zeaxanthin has been a fundamental step in the

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