hypertrophy/tobaksläktet

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Light promotion of hypocotyl gravitropism of a starch-deficient tobacco mutant correlates with plastid enlargement and sedimentation.

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Dark-grown hypocotyls of a starch-deficient mutant (NS458) of tobacco (Nicotiana sylvestris) lack amyloplasts and plastid sedimentation, and have severely reduced gravitropism. However, gravitropism improved dramatically when NS458 seedlings were grown in the light. To determine the extent of this

ZEA3: A Negative Modulator of Cytokinin Responses in Plant Seedlings.

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In Nicotiana plumbaginifolia cytokinins affect seedling development by inhibiting root growth and hypocotyl elongation and by stimulating cotyledon expansion. The zea3.1 mutant was selected for its inability to grow in conditions of low nitrogen and for its ability to grow independently on

Zea3: a pleiotropic mutation affecting cotyledon development, cytokinin resistance and carbon-nitrogen metabolism.

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When photomorphogenesis takes place during early plant development, the cotyledons undergo a metabolic transition from heterotrophic sink metabolism to autotrophic source metabolism. A mutant screen was devised for seedlings affected in the regulation of nitrate assimilation during this early

Heterologous Expression of PKPI and Pin1 Proteinase Inhibitors Enhances Plant Fitness and Broad-Spectrum Resistance to Biotic Threats

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Kunitz-type (PKPI) and Potato type I (Pin1) protease inhibitors (PIs) are two families of serine proteinase inhibitors often associated to plant storage organs and with well known insecticidal and nematicidal activities. Noteworthy, their ability to limit fungal and bacterial pathogenesis in

Structure of grafted crown-gall teratoma shoots of tobacco: Regulation of transformed cells.
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Crown-gall teratomas are tumors of higher plants with an intrinsic capacity for organogenesis. The growth pattern of tobacco (Nicotiana tabacum L.) teratoma shoots, which is highly aberrant in primary tumors, becomes normal when the shoots are grafted to healthy stock plants. However, certain

Formation of Megachromosomes from Heterochromatic Blocks of NICOTIANA TOMENTOSIFORMIS.
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A heterochromatic block (HB) from N. otophora occasionally undergoes great enlargement to form a "megachromosome" in hybrids and hybrid derivatives with N. tabacum. This paper shows that the two large HB's of closely related N. tomentosiformis, and perhaps a smaller one, also have the same

A comparison of regenerated cell walls in tobacco and cereal protoplasts.
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Four independent kinds of observations indicate that the cell wall regenerated by oat (Avena sativa L.) and corn (Zea mays L.) protoplasts in culture is less well developed than that regenerated by tobacco (Nicotiana tabacum L.) protoplasts. Following wall regeneration the cereal protoplasts

Growth modulation effects of CBM2a under the control of AtEXP4 and CaMV35S promoters in Arabidopsis thaliana, Nicotiana tabacum and Eucalyptus camaldulensis.
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The expression of cell-wall-targeted Carbohydrate Binding Modules (CBMs) can alter cell wall properties and modulate growth and development in plants such as tobacco and potato. CBM2a identified in xylanase 10A from Cellulomonas fimi is of particular interest for its ability to bind crystalline

Induction and regulation of chloroplast replication in mature tobacco leaf tissue.
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Chloroplast replication was induced in mature tobacco leaf tissue (Nicotiana tabacum L.) by culturing leaf discs on a sterile medium composed of salts and sucrose. Chloroplast replicaton is greatly enhanced by the addition of kinetin to this medium. Kinetin also enhances cell enlargement, but cell

Acid-growth response and alpha-expansins in suspension cultures of bright yellow 2 tobacco.
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The possibility that Bright Yellow 2 (BY2) tobacco (Nicotiana tabacum L.) suspension-cultured cells possess an expansin-mediated acid-growth mechanism was examined by multiple approaches. BY2 cells grew three times faster upon treatment with fusicoccin, which induces an acidification of the cell

Biochemical and structural consequences of a glycine deletion in the alpha-8 helix of protoporphyrinogen oxidase.
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A rare Gly210 deletion in protoporphyrinogen oxidase (PPO) was recently discovered in herbicide-resistant Amaranthus tuberculatus. According to the published X-ray structure of Nicotiana tabacum PPO, Gly210 is adjacent to, not in, the PPO active site, so it is a matter of interest to determine why

[Effects of repeated in vitro bud formation on somatic variation ability on a chlorophyll mutant of Nicotiana tabacum var. Samsun].
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A homozygous tl/tl chlorophyll mutant of Nicotiana tabacum var. Samsun shows spontaneous somatic variations on its leaves. These variations are either single (dark or light) or twinned (dark and light). In vitro culture of variation-free leaf fragments, on a particular medium, directly yields

Plasmatubules in the pollen tubes of Nicotiana sylvestris.
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Ultrastructural studies of the pollen tubes of Nicotiana sylvestris grown in the pistil revealed an extensive development of plasmatubules formed by evaginations of the plasma membrane. The plasmatubules occurred as twisted tubular structures in the periplasmic space along the tube wall and, in

Crystal structures of the ribonuclease MC1 mutants N71T and N71S in complex with 5'-GMP: structural basis for alterations in substrate specificity.
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Ribonuclease MC1 (RNase MC1), isolated from bitter gourd seeds, is a uridine specific RNase belonging to the RNase T2 family. Mutations of Asn71 in RNase MC1 to the amino acids Thr (N71T) and Ser (N71S) in guanosine preferential RNases altered the substrate specificity from uridine specific to

Methyl jasmonate upregulates biosynthetic gene expression, oxidation and conjugation of polyamines, and inhibits shoot formation in tobacco thin layers.
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The effect of methyl jasmonate (MJ) on de novo shoot formation and polyamine metabolism was investigated in thin layer explants of tobacco (Nicotiana tabacum L. cv. Samsun). A relatively low concentration of MJ (0.1 microM) enhanced explant fresh weight, but had no effect on the final number of

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hypertrophy/tobaksläktet

Light promotion of hypocotyl gravitropism of a starch-deficient tobacco mutant correlates with plastid enlargement and sedimentation.

ZEA3: A Negative Modulator of Cytokinin Responses in Plant Seedlings.

Zea3: a pleiotropic mutation affecting cotyledon development, cytokinin resistance and carbon-nitrogen metabolism.

Heterologous Expression of PKPI and Pin1 Proteinase Inhibitors Enhances Plant Fitness and Broad-Spectrum Resistance to Biotic Threats

Structure of grafted crown-gall teratoma shoots of tobacco: Regulation of transformed cells.

Formation of Megachromosomes from Heterochromatic Blocks of NICOTIANA TOMENTOSIFORMIS.

A comparison of regenerated cell walls in tobacco and cereal protoplasts.

Growth modulation effects of CBM2a under the control of AtEXP4 and CaMV35S promoters in Arabidopsis thaliana, Nicotiana tabacum and Eucalyptus camaldulensis.

Induction and regulation of chloroplast replication in mature tobacco leaf tissue.

Acid-growth response and alpha-expansins in suspension cultures of bright yellow 2 tobacco.

Biochemical and structural consequences of a glycine deletion in the alpha-8 helix of protoporphyrinogen oxidase.

[Effects of repeated in vitro bud formation on somatic variation ability on a chlorophyll mutant of Nicotiana tabacum var. Samsun].

Plasmatubules in the pollen tubes of Nicotiana sylvestris.

Crystal structures of the ribonuclease MC1 mutants N71T and N71S in complex with 5'-GMP: structural basis for alterations in substrate specificity.

Methyl jasmonate upregulates biosynthetic gene expression, oxidation and conjugation of polyamines, and inhibits shoot formation in tobacco thin layers.

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