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14 hasil
Changes in Cytokinins and Gibberellin-Like Substances in Pinus radiata Buds during Lateral Shoot Initiation and the Characterization of Ribosyl Zeatin and a Novel Ribosyl Zeatin Glycoside.
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Based on detection and quantitation by bioassay, endogenous gibberellin-like substances (GAs) and cytokinins (CKs) in Pinus radiata D. Don buds during sequential shoot initiation shift from less polar to more polar forms (GAs) and from conjugated to free forms (CKs). As the terminal bud moves from
Novel cytokinins: The predominant forms in mature buds of Pinus radiata.
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To elicit the roles of cytokinins in the regulation of maturation of Pinus radiata D. Don, the spectrum of endogenous cytokinins and their concentration in the mature buds were analysed using double-solvent extraction, column complex purification and separation, a novel immunoaffinity purification
Alterations in endogenous levels of cytokinins following grafting of Pinus radiata support ratio of cytokinins as an index of ageing and vigour.
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Markers for ageing or maturation in woody plants provides the possibility of identifying genotypes with a prolonged juvenile phase, or to evaluate reinvigoration procedures, such as grafting of adult material. This study focuses specifically on cytokinins (Cks) as markers, due to their role in the
Hormonal and gene dynamics in de novo shoot meristem formation during adventitious caulogenesis in cotyledons of Pinus pinea.
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Several members of WOX and KNOX gene families and several plant growth regulators, basically cytokinins and auxins, play a key role during adventitious caulogenesis in the conifer Pinus pinea. Similar to Arabidopsis thaliana, Pinus pinea shoot organogenesis is a multistep process. However, there are
Endogenous cytokinin and auxin profiles during in vitro organogenesis from vegetative buds of Pinus radiata adult trees.
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In Pinus radiata D. Don, the transition from the juvenile to the mature phase is characterized by a reduction in the tree's organogenic potential, which is usually reverted in breeding programs by reinvigoration procedures to enable vegetative propagation. In this work, we have determined the best
Organogenic responses of Pinus pinea cotyledons to hormonal treatments: BA metabolism and cytokinin content.
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Isolated cotyledons from mature Pinus pinea L. embryos were cultured in vitro in a factorial combination of 4.4, 10 and 44.4 microM N6-benzyladenine (BA) for 2, 4, 8, 16 and 35 days to optimize shoot regeneration. Incubation of explants in 44.4 microM BA for 4 days, in place of the standard
Production of cytokinin-like substances by mycorrhizal fungi of pine (Pinus sylvestris L.) in cultures with and without metabolites of actinomycetes.
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Studies on the effect of post culture liquids of actinomycetes on cytokinin-like substances production by mycorrhizal fungi have revealed that actinomycete metabolites inhibited or stimulated the synthesis of these compounds. The results of chromatographic analyses suggest, that substances
Cytokinins are involved in drought tolerance of Pinus radiata plants originating from embryonal masses induced at high temperatures.
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Vegetative propagation through somatic embryogenesis is an effective method to produce elite varieties and can be applied as a tool to study the response of plants to different stresses. Several studies show that environmental changes during embryogenesis could determine future plant development.
Microarray analysis and scale-free gene networks identify candidate regulators in drought-stressed roots of loblolly pine (P. taeda L.).
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BACKGROUND
Global transcriptional analysis of loblolly pine (Pinus taeda L.) is challenging due to limited molecular tools. PtGen2, a 26,496 feature cDNA microarray, was fabricated and used to assess drought-induced gene expression in loblolly pine propagule roots. Statistical analysis of
Increased endogenous indole-3-acetic acid:abscisic acid ratio is a reliable marker of Pinus massoniana rejuvenation.
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Pinus massoniana is a recalcitrant tree species for rooting in vitro. We rejuvenated 26-year-old P. massoniana trees by successive grafting. Rooting rates of rejuvenated shoots were > 83.1% after rooting induction. We compared endogenous levels of indole-3-acetic acid (IAA),
Rapid effects of red light on the isopentenyladenosine content in scots pine seeds.
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Red light (R) stimulates germination in Scots pine seed (Pinus sylvestris L.). The response is far red (FR) reversible. The dynamics of cytokinin changes following light treatment was investigated. Extracts were purified by immunoaffinity and high performance liquid chromatography.
Metabolome Integrated Analysis of High-Temperature Response in Pinus radiata.
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The integrative omics approach is crucial to identify the molecular mechanisms underlying high-temperature response in non-model species. Based on future scenarios of heat increase, Pinus radiata plants were exposed to a temperature of 40°C for a period of 5 days, including recovered plants (30 days
Physiological response to drought in radiata pine: phytohormone implication at leaf level.
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Pinus radiata D. Don is one of the most abundant species in the north of Spain. Knowledge of drought response mechanisms is essential to guarantee plantation survival under reduced water supply as predicted in the future. Tolerance mechanisms are being studied in breeding programs, because
Metabolites and hormones are involved in the intraspecific variability of drought hardening in radiata pine.
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Studies of metabolic and physiological bases of plant tolerance and hardening against drought are essential to improve genetic breeding programs, especially in productive species such as Pinus radiata. The exposure to different drought cycles is a highly effective tool that improves plant
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