Contribution of nitrogen fixed by Azospirillum to the n nutrition of spring wheat in Israel |
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Authors: | Yoram Kapulnik Moshe Feldman Yaacov Okon Yigal Henis |
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Institution: | 1. Department of Plant Pathology and Microbiology, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76 100 Israel;2. Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76 100, Israel |
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Abstract: | Acetylene reduction activity (ARA) was measured in cores containing roots of various Israeli wild and cultivated wheat lines colonized by Azospirillum. The inoculated plants were grown under greenhouse or field conditions. Although, no measurable ARA was detected during earlier stages of wheat development, 50–600 nmol C2H4 g?1 dry root h?1 was measured during heading and flowering stages. By using N yield balance and 15N dilution techniques, it was found that Triticum aestivum cv. Miriam inoculated with Azospirillum accumulated 20% more N (14N and 15N) at the booting stage than did the uninoculated control. This difference in N content became less apparent in grains. No significant 15N dilution could be found and the contribution of atmospheric N2 to the N content of grains of inoculated plants was negligible. It was concluded that the potential contribution of biological N2 fixation to spring wheat cultivation in Israel is very low. |
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