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The aims of this study were to quantify developmental differences in acid growth along the root axis and to determine whether these differences were due to alterations in cell turgor or cell wall properties. The apoplast pH of maize roots growing in hydroponics was altered from pH 7.0 to pH 3.4...
The possibility of using quenching analysis of chlorophyll a fluorescence as a selection tool for improving the cold tolerance of maize was investigated in six genotypes differing greatly in the ability to develop a competent photosynthetic apparatus at low temperature. Upon gradual cooling...
Site-specific recombinases are increasingly being used in transgenic plants to engineer genetic rearrangements such as the removal of unwanted selectable markers and the activation or delation of expressed genes. Here a convenient vector system for the activation of transgene expression by...
All manner of domestic and industrial activities lead to the injection of potentially toxic contaminants in to the air. Most have little or no discernible impact on the environment, because the resulting concentrations in the atmosphere fall well below the threshold for effects. Others attain...
Root elongation by wheat seedlings ( Triticum aestivum L. cv. Scout 66) was not inhibited by NaCl or KCl up to 130 mM in culture solutions or by high Na + (2 mg g -1 FW) or K + (4 mg g -1 FW) in the root tissue, provided that (Ca 2+ )>2 mM in the rooting medium. At (NaCl), (KCl), or (mannitol)...
Studies designed to investigate the cellular pathway of phloem unloading were conducted on two tomato lines with either high or low fruit invertase activities. Experiments were based on determination of the degree to which 3 H label from ( 3 H)-(fructosyl)-sucrose was randomized between fructose...
Oxidative damage originating from uncontrolled metabolism is thought to be responsible for the sensitivity to drying in recalcitrant seeds. This study compares the responses of respiration to drying and the loss of membrane integrity in isolated axes and cotyledons of the recalcitrant seeds of...
Although several mutations and genes affecting plant cytokinesis have been identified, mutant screens are not yet saturated and knowledge about gene function is still limited. A novel Arabidopsis mutation, cytokinesis defective 1 (cyd1) , was identified by partial or missing cell walls in...
The protogynous inflorescences of eastern skunk cabbage, Symplocarpus foetidus , are thermogenic and regulate spadix temperature ( T s ) well above ambient temperature ( T a ). Continuous records of oxygen consumption, carbon dioxide production, and temperatures of plants were made at a field...
The concentration of ethylene accumulating in the outer portion of sapwood in stems was measured in normal spruce and snake spruce from March to July in 1997. During growth, the endogenous levels of ethylene were higher in stem sapwood in the common spruce than in the snake spruce. Dormant...
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