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Página 1 a partir de 88 resultados
Purification, crystallization and preliminary X-ray diffraction study of a recombinant cytokinin oxidase from Zea mays.
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Cytokinins are hormones that are involved in plant growth and development. They are irreversibly degraded by cytokinin oxidases/dehydrogenases, flavoenzymes which contain a covalently bound flavine adenine dinucleotide (FAD) cofactor. Cytokinin oxidase from Zea mays (ZmCKO1) was overexpressed in the
Phytohormone Involvement in the Ustilago maydis- Zea mays Pathosystem: Relationships between Abscisic Acid and Cytokinin Levels and Strain Virulence in Infected Cob Tissue.
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Ustilago maydis is the causative agent of common smut of corn. Early studies noted its ability to synthesize phytohormones and, more recently these growth promoting substances were confirmed as cytokinins (CKs). Cytokinins comprise a group of phytohormones commonly associated with actively dividing
High-level expression and characterization of Zea mays cytokinin oxidase/dehydrogenase in Yarrowia lipolytica.
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Cytokinin oxidase/dehydrogenase (CKO/CKX) is a flavoenzyme, which irreversibly inactivates cytokinins by severing the isoprenoid side chain from the adenine/adenosine moiety. There are several genes coding for the enzyme in maize (Zea mays). A Z. mays CKO1 cDNA was cloned in the yeast Yarrowia
Expression and functional analysis of genes encoding cytokinin receptor-like histidine kinase in maize (Zea mays L.).
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Cytokinin signaling is vital for plant growth and development which function via the two-component system (TCS). As one of the key component of TCS, transmembrane histidine kinases (HK) are encoded by a small gene family in plants. In this study, we focused on expression and functional analysis of
Cytokinin oxidase from Zea mays: purification, cDNA cloning and expression in moss protoplasts.
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Cytokinins are degraded by cytokinin oxidases (CKOs) which catalyse cleavage of the N6-(isopent-2-enyl)-side chain resulting in formation of adenine-type compounds. CKO activity has been recorded in many plants and is thought to play a key role in controlling cytokinin levels in plants. Several
Cytokinin-induced photosynthetic adaptability of Zea mays L. to drought stress associated with nitric oxide signal: probed by ESR spectroscopy and fast OJIP fluorescence rise.
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Nitric oxide (NO), as a diffusible molecule, performs important roles in diverse physiological processes. Interestingly, NO signaling is based on interactions with plant hormones. The aim of this study was, first, to test the effect of cytokinin (CTK) on the primary reaction of photosynthesis under
A member of the maize isopentenyl transferase gene family, Zea mays isopentenyl transferase 2 (ZmIPT2), encodes a cytokinin biosynthetic enzyme expressed during kernel development. Cytokinin biosynthesis in maize.
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Cytokinins (CKs) are plant hormones that regulate a large number of processes associated with plant growth and development such as induction of stomata opening, delayed senescence, suppression of auxin-induced apical dominance, signaling of nitrogen availability, differentiation of plastids and
A cytokinin oxidase in Zea mays.
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Members of the c1/pl1 regulatory gene family mediate the response of maize aleurone and mesocotyl to different light qualities and cytokinins.
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We investigated the role of transcription factors (R, SN, C1, and PL) in the regulation of anthocyanin biosynthesis by different light qualities (white, red, blue, and ultraviolet) and by cytokinin in maize (Zea mays). We analyzed anthocyanin accumulation, structural gene expression, and regulatory
Studies of aberrant phyllotaxy1 mutants of maize indicate complex interactions between auxin and cytokinin signaling in the shoot apical meristem.
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One of the most fascinating aspects of plant morphology is the regular geometric arrangement of leaves and flowers, called phyllotaxy. The shoot apical meristem (SAM) determines these patterns, which vary depending on species and developmental stage. Auxin acts as an instructive signal in leaf
The Maize Hairy Sheath Frayed1 (Hsf1) Mutation Alters Leaf Patterning Through Increased Cytokinin Signaling.
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Leaf morphogenesis requires growth polarized along three axes - proximal-distal, medial-lateral and abaxial-adaxial. Grass leaves display a prominent proximal-distal (P-D) polarity consisting of a proximal sheath separated from the distal blade by the auricle and ligule. Although proper
Kinetic and chemical analyses of the cytokinin dehydrogenase-catalysed reaction: correlations with the crystal structure.
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CKX (cytokinin dehydrogenase) is a flavoprotein that cleaves cytokinins to adenine and the corresponding side-chain aldehyde using a quinone-type electron acceptor. In the present study, reactions of maize (Zea mays) CKX with five different substrates (N6-isopentenyladenine, trans-zeatin, kinetin,
Cytokinin-binding protein (70 kDa) from etioplasts and amyloplasts of etiolated maize seedlings and chloroplasts of green plants and its putative function.
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Cytokinins regulate chloroplast differentiation and functioning, but their targets in plastids are not known. In this connection, the plastid localization of the 70 kDa cytokinin-binding protein (CBP70) was studied immunocytochemically in 4-d-old etiolated maize seedlings (Zea mays L., cv. Elbrus)
Cytokinin-binding protein (70 kDa): localization in tissues and cells of etiolated maize seedlings and its putative function.
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The distribution pattern of a 70 kDa cytokinin-binding protein (CBP70) was studied in 4-d-old etiolated maize seedlings (Zea mays L., cv. Elbrus). CBP70 was detected in crude protein extracts of all root zones and shoot parts by western blotting and by the sandwich ELISA (enzyme-linked immunosorbent
C2-substituted aromatic cytokinin sugar conjugates delay the onset of senescence by maintaining the activity of the photosynthetic apparatus.
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Cytokinins are plant hormones with biological functions ranging from coordination of plant growth and development to the regulation of senescence. A series of 2-chloro-N(6)-(halogenobenzylamino)purine ribosides was prepared and tested for cytokinin activity in detached wheat leaf senescence, tobacco
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