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Evidence is given for the presence, in the mould Mucor Rouxianusand in several Rhisopus species, of an amylolytic enzyme producingglucose directly from starch. This glucosidase probably possessesa wide specificity range and attacks maltose as well. It doesnot destroy the iodine reaction of starch, but as a rule itis accompanied by another amylase which does destroy thb reaction.Of the mould amylases investigated, Mucor-amylase containedthe highest proportion of the glucosidase. 相似文献
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Salicylic Acid Levels in Thermogenic and Non-Thermogenic Plants 总被引:7,自引:0,他引:7
RASKIN ILYA; SKUBATZ HANNA; TANG WILLIAM; MEEUSE BASTIAAN J. D. 《Annals of botany》1990,66(4):369-373
The natural trigger for heat production in the thermogenic inflorescencesof Sauromatum guttatum Schott (voodoo lily) was recently identifiedas salicylic acid (SA), which induced heat production at levelsas low as 13 ng g f. wt1. Since then the levels of SAwere determined in other thermogenic and non-thermogenic plantspecies. In thermogenic inflorescences of five aroid species,and in male cones of at least four thermogenic cycads SA levelsduring heat production exceeded 1 µg g f. wt1.SA was not detected in the thermogenic flowers of a water lily,Victoria regia Lindl. (Nymphaeaceae), and Bactris major Jacq.(Palmae). Levels of salicylic acid varied substantially in thefloral parts of seven non-thermogenic species and in the leavesof 27 non-thermogenic species. Amorphophallus campanulatus Blume ex Decne, Arum italicum Mill., Arum dioscoridis Sibth. & Son., Philodendron selloum Koch, Monstera deliciosa Liebm., Encephalartosferox Bertol. f., Encephalartos hildebrandtii A. Br. & Bouché, Encephalartos gratus Prain, Dioon edule Lindl. cv. edule, Dioon edule Lindl. cv angustifolium, Sauromatum guttatum Schott, voodoo lily, Victoria regia Lindl., Bactris major Jack, salicylic acid, thermogenicity, heat production 相似文献
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Moss oxalic acid oxidase freed from catalase by boiling is stronglyinhibited by the "metal-complexing" compounds such as thiocyanate,azide, diethyldithiocarbamate, and hydrosulfite. Inactivatedby dialysis against thiocyanate or azide, the enzyme can bereactivated to a considerable extent by the addition of ferricsalt, cytochrome-c or hemoglobin, not by other metal ions, suchas Cu2+, Zn2+ , Mn2+, and Fe2+. Nitrate, chlorate, monoiodoacetate,and iodide also act as strong inhibitors towards moss oxalicacid oxidase. Some enzyme fractions which were obtained by the sodium sulfateprecipitation method were stimulated by Fe3+, but not by cytochrome-cor by other metallic ions. This stimulation was inhibited bythiocyanate, azide and monoiodoacetate.
1 Present address: Biological Institute, University of Toyama,Toyama 相似文献
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Oscillatory Heat-Production in the Male Cones of Cycads 总被引:1,自引:0,他引:1
SKUBATZ HANNA; TANG WILLIAM; MEEUSE BASTIAAN J D. 《Journal of experimental botany》1993,44(2):489-492
Microcalorimetric analysis of heat-production by single intactsporophylls from thermogenic male cones of two cycad species(Ceratozamia miqueliana H. Wendl. and Zamia furfuracea L. f.)showed an oscillatory behaviour for three consecutive days duringpollen maturation and shedding. In sporophylls from C. rumphiiMiq., a weakly thermogenic species with no maximum of heat-production,such oscillations were not detected. The presence of the alternativerespiratory pathway in the sporophylls of the male cones ofZamia pumila L. has been demonstrated. Key words: Alternative pathway, cycads, heat-production, microcalorimetry, oscillation 相似文献
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SKUBATZ HANNA; WILLIAMSON PAULA S.; SCHNEIDER EDWARD L.; MEEUSE BASTIAAN J D 《Journal of experimental botany》1990,41(10):1335-1339
The thermogenic carpellary appendages of the flowers of Victoriacruziana d'Orb. and the thermogenic staminal appendages of Nelumbolutea (Willd.) Pers. possess the cyanide-insensitive, alternativerespiratory pathway. The presence of this pathway was demonstratedin tissue slices as well as in mitochondria. The thermogenicactivity was accompanied by ultrastructural changes in the Victoriamitochondria. Before anthesis, mitochondria with well-developedcristae were present in appendage tissue in large numbers. Duringanthesis, lamelliform cristae appeared in a different orientation. Key words: Victoria, Nelumbo, flowers, thermogenicity, mitochondria 相似文献
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