PHOTOSYNTHATE REQUIREMENTS FOR NITRATE UPTAKE AND REDUCTION IN ROOTS OF Vicia faba L. SEEDLINGS | ||
| Journal of Plant Production | ||
| Article 22, Volume 34, Issue 7, July 2009, Pages 8159-8164 PDF (349.48 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2009.118799 | ||
| Author | ||
| M. A. Wasfi* | ||
| Dept. of Botany, Univ. of Khartoum, P.O. Box 321, Khartoum, Sudan. | ||
| Abstract | ||
| Nitrate uptake was examined in the roots of 15-day old nitrogen depleted broad bean (Vicia faba L.) seedlings during a 10 h. exposure to 7 mM KNO3. The seedlings were subjected to partial defoliation, thermal treatment at stem bases and girdling. The loss of nitrate from the medium during incubation of the seedlings indicated that about 30% of the nitrates were absorbed during the first 5 h. It was evident that the energy expanded for nitrate uptake and reduction came from the tops, since partial defoliation, thermal treatment and girdling restricted nitrate uptake and reduction. The data are interpreted as indicating a close interrelationship between nitrate uptake and reduction and carbohydrate metabolism, particularly in relation to the export of photosynthate from the tops to the roots. | ||
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