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Possible involvement of impaired polyamine biosynthesis in the poor performance of tomato pollen ( Lycopersicon esculentum Mill.) at high temperatures was investigated. Incubation of pollen at 38°C suppressed the increase of S-adenosylmethionine decarboxylase (SAMDC) activity in germinating...
We analyzed the promoter of the genes encoding the ribulose-1,5-bisphosphate carboxylase/oxygenase ( rbc ) in the cyanobacterium Synechococcus sp. PCC7002 and localized the CO 2 -regulatory element. Cyanobacterial transformants were constructed with several DNA segments of the rbc promoter fused...
The non-linear differential equation that describes the coupling between water transport and solute transport in the apoplast canal system in plants was proposed by Katou and Furumoto in 1986. In the present paper, we analytically solved the equation in order to find the law describing the canal...
Rice ( Oryza sativa L . ) shows the highest tolerance to Al toxicity among small-grain cereal crops, however, the mechanisms and genetics responsible for its high Al tolerance are not yet well understood. We investigated the response of rice to Al stress using the japonica variety Koshihikari in...
In plants of Sinapis alba and Arabidopsis thaliana , leaf exudate (phloem sap) was analysed during and after a single long day inducing flowering and in control short days. The amounts of carbohydrates and amino acids were measured to estimate the organic C : N ratio. In both species, the C : N...
The genes for two types of rice phloem protein (RPP16 and RPP17) were isolated and characterized. Conservation of five exon sizes as well as splicing positions between the two genes suggest that either RPP16 or RPP17 is a resultant of gene duplication. By protein blot analysis, RPP16 and RPP17...
The 26S proteasome is known to play pivotal roles in cell-cycle progression in various eukaryotic cells; however, little is known about its role in higher plants. Here we report that the subcellular distribution of the 26S proteasome is dynamically changed in a cell-cycle dependent manner in...
Bundles of microtubules and cross-bridges between microtubules in the bundles have been observed in phragmoplasts, but proteins responsible for forming the cross-bridges have not been identified. We isolated TMBP200, a novel microtubule bundling polypeptide with an estimated relative molecular...
We investigated the reason for the absence of the long-wavelength PSI Chl a fluorescence at –196°C in the cyanobacterium Gloeobacter violaceus using two methods: p -nitrothiophenol ( p -NTP) treatment and time-resolved fluorescence spectra. The p -NTP treatment showed that PSII Chl a...
In many eukaryotic organisms, homeobox genes are important regulators that specify the cell fate and body plan in early embryogenesis. In this study, a gene designated OSTF1 ( Oryza sativa transcription factor 1) encoding a homeodomain protein in rice was isolated and characterized. The encoded...
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