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oryza sativa/hypoxia
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Soluble sugar availability of aerobically germinated barley, oat and rice coleoptiles in anoxia.
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Physiological and metabolic responses to anoxia were compared for aerobically germinated seedlings of barley (Hordeum vulgare), oat (Avena sativa) and rice (Oryza sativa). Coleoptile growth of barley, oat and rice seedlings was suppressed by a 24 h-anoxic stress, but the growth of the rice
Fatty acids of rice coleoptiles in air and anoxia.
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The metabolism of lipids, like that of other components, was adversely and strongly affected when rice (Oryza sativa L.) coleoptiles were grown anaerobically. In aerobic coleoptiles, the amounts of total fatty acid, phospholipid, and total lipid per coleoptile increased by 2.5- to 3-fold between
Sugar modulation of alpha-amylase genes under anoxia.
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Tolerance to low oxygen availability is likely to be due to the interaction of several factors. Sugar availability is one of the elements required to support anaerobic metabolism. In cereal grains the availability of soluble sugars is limited, while starch is stored in large amounts. Degradation of
Differences in the Anaerobic Lactate-Succinate Production and in the Changes of Cell Sap pH for Plants with High and Low Resistance to Anoxia.
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Anaerobically treated seedlings of Oryza sativa L. var arborio accumulated in their shoots more succinate than lactate and cell sap became alkaline. Conversely, in Triticum aestivum L. var MEK 86 lactate accumulation was far higher than that of succinate and cell sap was acidified. Anoxia clearly
Vacuolar H(+)-translocating pyrophosphatase is induced by anoxia or chilling in seedlings of rice.
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The present study was undertaken to determine whether vacuolar H(+)-pyrophosphatase (V-PPase) might replace vacuolar H(+)-ATPase under energy stress due to anoxia or chilling in anoxia-tolerant species such as rice (Oryza sativa L.) and corn (Zea mays L.). The relative transcript level of V-PPase in
Sugar utilization and anoxia tolerance in rice roots acclimated by hypoxic pretreatment.
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Although most cereal roots cannot elongate under anoxic conditions, primary roots of three-day-old rice (Oryza sativa L.) seedlings were able to elongate during a 24-h period of anoxia. Hypoxic pretreatment (H-PT) increased the elongation of their roots. Sucrose synthase (EC 2.4.1.13), glucokinase
In silico analysis of motifs in promoters of differentially expressed genes in rice (Oryza sativa L.) under anoxia.
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The aim of this study was to characterise the molecular mechanisms of transcriptional regulation of Differentially Expressed Genes (DEGs) in rice coleoptiles under anoxia by identifying motifs that are common in the promoter region of co-regulated genes. Un-changed DEGs (<2 fold and >-2),
Effects of Hypoxia on 13NH4+ Fluxes in Rice Roots. Kinetics and compartmental analysis Kinetics and Compartmental Analysis
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Techniques of compartmental (efflux) and kinetic influx analyses with the radiotracer 13NH4+ were used to examine the adaptation to hypoxia (15, 35, and 50% O2 saturation) of root N uptake and metabolism in 3-week-old hydroponically grown rice (Oryza sativa L., cv IR72) seedlings. A time-dependence
Effects of anoxia on mitochondrial biogenesis in rice shoots: modification of in organello translation characteristics.
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Shoots of germinating rice (Oryza sativa L.) seedlings are able to grow under anoxia and to withstand long periods of anoxic treatment. Mitochondria were purified from aerobically germinated and anaerobically treated rice shoots by differential and isopycnic centrifugation and were found to consist
Carbohydrate metabolism in germinating caryopses of Oryza sativa L. exposed to prolonged anoxia.
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Anoxia tolerance can be evaluated not only in terms of growth or survival of plant organs during oxygen deprivation, but also in relation to carbohydrate utilization in the context of a well-modulated fermentative metabolism. Rice (Oryza spp.) is unique among cereals, in that it has the distinctive
Adaptation of ribonucleic Acid metabolism to anoxia in rice embryos.
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Rice (Oryza sativa var. Cigalon) is a plant which can adapt to very stringent anoxic conditions. It has previously been shown that during the adaptation period the energy charge can be used as a marker for metabolic activity. We have studied RNA metabolism during this period and correlated it with
Response to Anoxia in Rice and Wheat Seedlings: Changes in the pH of Intracellular Compartments, Glucose-6-Phosphate Level, and Metabolic Rate.
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(31)P nuclear magnetic resonance spectroscopy was used to measure intracellular pH in living tissues. Oxygen deprivation caused fast cytoplasmic acidification from pH 7.4 to 7.0 in shoots of rice, Oryza sativa L. var arborio, a species highly resistant to anoxia. Acidification was complete after 10
Anoxia tolerance in rice roots acclimated by several different periods of hypoxia.
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Rice (Oryza sativa L.) seedlings were subjected to hypoxic pretreatment (H-PT; incubated in 5% O2 atmosphere) for various lengths of time followed by an anoxic stress. Anoxia tolerance of rice roots was improved with increasing duration of H-PT, but longer H-PT than 12 h gave no additional
Responses by coleoptiles of intact rice seedlings to anoxia: k(+) net uptake from the external solution and translocation from the caryopses.
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This study evaluated the effects of anoxia on K(+) uptake and translocation in 3-4-d-old, intact, rice seedlings (Oryza sativa L. cv. Calrose). Rates of net K(+) uptake from the medium over 24 h by coleoptiles of anoxic seedlings were inhibited by 83-91 %, when compared with rates in aerated
Ethanolic fermentation and anoxia tolerance in four rice cultivars.
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The relationship between coleoptile elongation and ethanolic fermentation was investigated in rice (Oryza sativa L.) coleoptiles of four cultivars subjected to a 48-h anoxic stress. The coleoptile elongation of all cultivars was suppressed by anoxic stress; however, the elongation of cvs Yukihikari
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