Nitrate Metabolism in Alfalfa Root Nodules under Water Stress
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چکیده
منابع مشابه
Short-term metabolic responses of soybean root nodules to nitrate.
Soybean (Glycine max L. Merr.) plants exposed to 10 mM KNO(3) for a 4 d period were used to test the correlation between nitrogenase activity, gene expression and sucrose metabolism. Nitrate caused the down-regulation of sucrose synthase (SS) transcripts within 1 d, although a decline in nodule SS activity and an increase in nodule sucrose content only occurred after 3-4 d. In a second experime...
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Nitrate-independent nitrate reductase (NR) activity is generally found in legume root nodules. Therefore, the effects of nitrate on plant NR activity and mRNA were investigated in the root nodules of Lotus japonicus (L. japonicus). Both NR activity and mRNA levels in roots and root nodules were up-regulated by the addition of nitrate. In the absence of nitrate, NR activity and mRNA were detecte...
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doi: 10.1111/j.1399-3054.2006.00802.x The effect of NaCl stress (50 mM) and validamycin A treatment (30 mM) on growth and nitrogen fixation of Lotus japonicus was investigated in plants cultured under symbiotic and hydroponics conditions for teen weeks (flowering stage). Validamycin Awas used as a potent trehalase inhibitor, and was able to produce a five-fold increase in the level of trehalose...
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Although the mechanisms of nodule N(2) fixation in legumes are now well documented, some uncertainty remains on the metabolic consequences of water deficit. In most cases, little consideration is given to other organs and, therefore, the coordinated changes in metabolism in leaves, roots, and nodules are not well known. Here, the effect of water restriction on exclusively N(2)-fixing alfalfa (M...
متن کاملRegulation of root water uptake under abiotic stress conditions.
A common effect of several abiotic stresses is to cause tissue dehydration. Such dehydration is caused by the imbalance between root water uptake and leaf transpiration. Under some specific stress conditions, regulation of root water uptake is more crucial to overcome stress injury than regulation of leaf transpiration. This review first describes present knowledge about how water is taken up b...
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ژورنال
عنوان ژورنال: Journal of Experimental Botany
سال: 1986
ISSN: 0022-0957,1460-2431
DOI: 10.1093/jxb/37.6.798