NITRATE-NITROGEN ASSIMILATION IN THE LEAVES OF HELIANTHUS ANNUUS L.
نویسندگان
چکیده
منابع مشابه
Morphogenetical Aspects in Helianthus Annuus L. during the Ontogenesis
Sunflower (Helianthus annuus) is annual plants native to Mexico and is valuable from economic, as well as from ornamental point of view. In this paper the edification of the primary and the secondary structure of the vegetative organs were followed during the ontogenesis. The root with primary structure is tetrarch, with four strands each of xylem and phloem that alternate with one another. In ...
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The influence of nutrient nitrate level (0-20 millimolar) on the effects of NO(2) (0-0.5 parts per million) on growth, K, photosynthetic pigment, N contents, and the activities of enzymes of N assimilation was studied in bean (Phaseolus vulgaris L. cv Kinghorn Wax) leaves. Exposing 7-day old bean seedlings for 5 days continuously to 0.02 to 0.5 parts per million NO(2) increased plant height, fr...
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Kaurene synthetase B activity (conversion of copalyl pyrophosphate to ent-kaurene) is readily detectable in crude cell-free extracts of 3- to 4-day old dark-grown sunflower (Helianthus annuus cv. Mammoth) seedlings, whereas little or no kaurene synthetase AB activity (conversion of geranylgeranyl pyrophosphate to ent-kaurene) can be found in these extracts under comparable assay conditions. A l...
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Elevated CO2 concentrations were found to cause early senescence during leaf development in sunflower (Helianthus annuus L.) plants, probably by reducing nitrogen availability since key enzymes of nitrogen metabolism, including nitrate reductase (NR); glutamine synthetase (GS) and glutamate dehydrogenase (GDH), were affected. Elevated CO2 concentrations significantly decreased the activity of n...
متن کاملThe rate of CO2 assimilation controls the expression and activity of glutamine synthetase through sugar formation in sun ̄ower (Helianthus annuus L.) leaves
The expression and activity of glutamine synthetase (GS, EC 6.3.1.2) were examined in relation to the rate of CO2 assimilation in sun ̄ower (Helianthus annuus L.) leaves. Intact plants were kept in the dark for 72 h and subsequently exposed to light under different atmospheric CO2 concentrations (100, 400 and 1200 ml l) for 6 h. The in vivo rates of net CO2 assimilation correlated with atmospher...
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ژورنال
عنوان ژورنال: New Phytologist
سال: 1980
ISSN: 0028-646X,1469-8137
DOI: 10.1111/j.1469-8137.1980.tb04465.x