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Hexose phosphorylation by hexokinases plays an important role in glycolysis, biosynthesis and control of sugar‐modulated genes. Several cytosolic hexokinase and fructokinase isoforms have been characterized and organelle‐bound hexokinases have also been detected in higher plants. In this...
Aerial parts of lettuce plants were grown under natural tropical fluctuating ambient temperatures, but with their roots exposed to two different root‐zone temperatures (RZTs): a constant 20 °C‐RZT and a fluctuating ambient (A‐) RZT from 23–40 °C. Plants grown at A‐RZT showed lower...
Determination of pore size of the cell wall of Chara corallina has been made by using the polyethylene glycol (PEG) series as the hydrophilic probing molecules. In these experiments, the polydispersity of commercial preparation of PEGs was allowed for. The mass share (γ p ) of polyethylene...
14 C‐salicylic acid (SA) was used to monitor SA metabolism and its regulation in tobacco cell suspension culture. Two SA concentrations (20 μM and 200 μM) were used for comparison. SA was quickly taken up in both treatments, and the 200 μM‐treated cells absorbed approximately 15 times that...
Hydrogen peroxide (H 2 O 2 ) was detected cytochemically in plant tissues during anoxia and re‐oxygenation by transmission electron microscopy using its reaction with cerium chloride to produce electron dense precipitates of cerium perhydroxides. Anoxia‐tolerant yellow flag iris ( Iris...
Continuous measurements of stomatal aperture simultaneously with gas exchange during periods of stomatal oscillations are reported for the first time. Measurements were performed in the field on attached leaves of undisturbed Sambucus nigra L. plants which were subjected to step‐wise increases...
The pathway of biosynthesis of abscisic acid (ABA) can be considered to comprise three stages: (i) early reactions in which small phosphorylated intermediates are assembled as precursors of (ii) intermediate reactions which begin with the formation of the uncyclized C 40 carotenoid phytoene and...
Pea plants ( Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO 3 − ) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO 3 − ). No changes of abscisic acid (ABA) content were found...
Exposure to UV‐B radiation resulted in a loss of chlorophyll and an increase in lipid damage in a similar manner to that induced during natural senescence. In addition, exposure to UV‐B led to the induction of a number of genes associated with senescence ( SAG12, 13, 14 , and 17 ). These...
Phosphorus (P)–zinc (Zn) interactions were investigated in two wheat cultivars (Brookton versus Krichauff) differing in P uptake efficiency. The experiment was done in a growth chamber. Rock phosphate (RP) or CaHPO 4 (CaP) were used as P sources, and ammonium nitrate (AN) or nitrate only (NO)...
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