Investigation on the role of nodule cytokinins in regulation of nitrate reductase activity ofPhaseolus mungo (L.) |
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| Authors: | S J H Rizvi V Rizvi D Mukerji and S N Mathur |
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| Institution: | (1) Plant Physiology Research Laboratory, Department of Botany, University of Gorakhpur, Gorakhpur, India;(2) Present address: College of Basic Sciences and Humanities, Laboratory of Allelopathy and Natural Products, Department of Botany and Plant Physiology, Rajendra Agricultural University, 848125 Pusa, Samastipur, India |
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| Abstract: | The effects of some nodular cytokinis, zeatin (Z), zeatin riboside (ZR), N6 ( 2-isopentenyl) adenine (IPA), and N6 (2-isopentenyI) adenosine (IPAS) on nitrate reductase (E.C 1.9.6.1) activity of root nodules ofPhaseolus mungo were investigated. The cytokinis were also tested for their effect on nitrate uptake by nodules. The results show that IPAS is the most effective of all the four cytokinins tested. Z and IPA, which caused higherin vivo activity than ZR and IPAS, stimulated uptake of nitrate by nodules. The other two (ZR and IPAS) while inhibiting uptake showed greaterin vitro activity than Z and IPA. It may be concluded that some cytokinins, in addition to their direct effects on the enzyme, may increase the substrate availability to it, whereas others may have only an direct effect on the enzyme activation or degradation.Deceased. |
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