EFFECT OF NITRATE-N ON GROWTH AND N2 FIXATION BY Medicago sativa, L. AND Clitoria ternatea, L. | ||||
| Journal of Plant Production | ||||
| Article 12, Volume 34, Issue 1, January 2009, Page 411-417 PDF (385.92 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2009.116625 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| M. A. Wasfi; Mawaheb E. M. Elnour | ||||
| Dept. of Botany, Univ. of Khartoum, P.O.Box 321, Khartoum, Sudan | ||||
| Abstract | ||||
| Addition of nitrate significantly increased nitrogenous fractions (NO-3, T.N.,T., S.N)*, fresh and dry weights of roots and shoots in both plant species. Carbohydrates (T.S.,T.,S.S)*, acetylene reduction activity (A.R.A)* and nodule fresh weights were significantly decreased as compared with untreated nodulated plants. The depressive effect of nitrate on acetylene reduction activity is discussed in relation to hypotheses explaining photosynthate demand for nitrate assimilation in the nodules (assimilate deprivation), or nitrite poisoning. Present data are in favour of the assimilate deprivation hypothesis. | ||||
| Keywords | ||||
| Nitrates; carbohydrates; acetylene reduction activity assimilate deprivation | ||||
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