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Nodulation and Nitrogen Fixation by Lupinus varius L. a Wild Type of Lupine Grown in the Southern Part of the Eastern Desert of Egypt under Different Water Regimes

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Author(s): M. Younis

Journal: Journal of Biological Sciences
ISSN 1727-3048

Volume: 2;
Issue: 9;
Start page: 596;
Date: 2002;
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Keywords: Nodulation | nitrogen fixation | wild legumes | lupinus L. | desert

ABSTRACT
The effect of water stress on growth and symbiotic relations of Lupinus varius L. a wild type of lupine growing in Wadi Eigat in the southern part of the eastern desert of Egypt was evaluated in pot experiments. Four treatments of water regimes each were applied to inoculated Lupinus varius L. 20 days after planting (DAP), for growth and symbiotic relations studies. Chemical analysis of loamy sand soil showed that EC value was slightly high. Significant decrease in nodule population, nodules mass, total protein and leghaemoglobin content of nodule cytosol, specific nitrogenase activity and at low water regimes was recorded. Despite this significant decrease, it appears, however, that plants subjected to severe drought (T3 and T4) exhibit remarkable tolerance indicating that Lupinus varius L. is tolerant to severe water stress in desert soil.
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