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12 Ergebnisse
Numerous and highly developed tubular projections from plastids observed in Tobacco epidermal cells.
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Tubular projections from plastids (stromules) were observed using a stroma-targeted green fluorescent protein (GFP) fusion protein and a confocal laser scanning microscope. In tobacco (Nicotiana tabacum) epidermal cells, stromules were observed at a high frequency. Some of them were long and
The Association of Severe Epidemics of Cucumber Mosaic in Commercial Fields of Pepper and Tobacco in North Florida with Inoculum in Commelina benghalensis and C. communis.
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Since 1995, severe epidemics of cucumber mosaic virus (CMV) have occurred in select fields of tobacco (Nicotiana tabacum) and pepper (Capsicum annuum) in three counties in northern Florida. Yield losses greater than 50% have occurred in both crops. Baker and Zettler (1) identified the presence of
Rapid low temperature-induced stomatal closure occurs in cold-tolerant Commelina communis leaves but not in cold-sensitive tobacco leaves, via a mechanism that involves apoplastic calcium but not abscisic acid.
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Commelina communis stomata closed within 1 h of transferring intact plants from 27 degrees C to 7 degrees C, whereas tobacco (Nicotiana rustica) stomata did not until the leaves wilted. Abscisic acid (ABA) did not mediate cold-induced C. communis stomatal closure: At low temperatures, bulk leaf ABA
The Commelina yellow mottle virus promoter drives companion-cell-specific gene expression in multiple organs of transgenic tobacco.
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Previous work has demonstrated that some endogenous plant gene promoters are active in selective companion cells of the phloem, depending on organ types and developmental stages. Here we report that the Commelina yellow mottle virus (CoYMV) promoter is active in the companion cells of leaves, stems
Inhibition of phospholipase D alpha by N-acylethanolamines.
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N-Acylethanolamines (NAEs) are endogenous lipids in plants produced from the phospholipid precursor, N-acylphosphatidylethanolamine, by phospholipase D (PLD). Here, we show that seven types of plant NAEs differing in acyl chain length and degree of unsaturation were potent inhibitors of the
The effects of manipulating phospholipase C on guard cell ABA-signalling.
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Studies using stably transformed tobacco plants containing very low levels of PI-PLC in their guard cells show that this enzyme plays a role in the events associated with the inhibition of stomatal opening by ABA, but not in the cellular reactions that are responsible for ABA-induced stomatal
Identification of cis elements involved in Commelina yellow mottle virus promoter activity.
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Commelina yellow mottle virus (CoYMV) is a double-stranded DNA virus that infects a monocot host. A promoter fragment isolated from CoYMV is a strong promoter when assayed after transient introduction into monocot and dicot suspension cells and is highly active in vascular cells of flowers, leaves,
[Deletion analysis and functional studies of the promoter from commelina yellow mottle virus].
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Commelina Yellow Mottle Virus(CoYMV) is a double-stranded, circular DNA virus and its promoter could direct GUS gene specifically expressing in phloem tissue of transgenic tobacco plants. To determine the optimal promoter sequence for pholem-specific gene expression, CoYMV promoter was deleted from
The Commelina yellow mottle virus promoter is a strong promoter in vascular and reproductive tissues.
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Commelina yellow mottle virus (CoYMV) is a double-stranded DNA virus that infects the monocot Commelina diffusa. Although CoYMV and cauliflower mosaic virus (CaMV; another double-stranded DNA virus) probably replicate by a similar mechanism, the particle morphology and host range of CoYMV place it
Electrical potentials in stomatal complexes.
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Guard cells of several species, but predominantly Commelina communis, were impaled by micropipette electrodes and potential differences measured that occurred between cell compartments and the flowing bathing medium. The wall developed a Donnan potential that was between -60 and -70 millivolt in 30
Bacterial Wilt of Solanaceae Caused by Ralstonia solanacearum Race 1 Biovar 3 in Mali.
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Ralstonia solanacearum (Smith) Yabuuchi et al. causes bacterial wilt worldwide on a wide range of plant species. In Mali, the disease is commonly found on potato (Solanum tuberosum L.), tomato (Lycopersicon esculentum var. esculentum L.), pepper (Capsicum annuum L.), eggplant (Solanum melongena L.),
The responses of guard and mesophyll cell photosynthesis to CO2, O2, light, and water stress in a range of species are similar.
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High resolution chlorophyll a fluorescence imaging was used to compare the photosynthetic efficiency of PSII electron transport (estimated by Fq'/Fm') in guard cell chloroplasts and the underlying mesophyll in intact leaves of six different species: Commelina communis, Vicia faba, Amaranthus
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