Host-genetic control of nitrogen fixation in the legume-Rhizobium symbiosis: complication in the genetic analysis due to maternal effects |
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Authors: | T A Lie P C J M Timmermans |
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Institution: | (1) Laboratory of Microbiology, Agricultural University, Wageningen, The Netherlands |
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Abstract: | Summary In pea cv. Afghanistan a recessive gene sym 6 prevents the full expression of nitrogenase activity in root nodules, induced
byRhizobium leguminosarum strain F 13. In contrast, nitrogenase activity is fully expressed in pea cv. Iran. A comparison of the reciprocal hybrids
of these two plants showed that the size of the plant was determined by the mother plant (maternal effect). Therefore the
shoot weight and the total amount of nitrogen fixed are not suitable as parameters for a genetic analysis. The % nitrogen
of the shoot and the specific activity of the nodules per gram of nodules are more reliable, but for practical purposes the
specific activity of the nodules expressed per gram of shoot tissue can be used. |
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Keywords: | Genetic control Nitrogen fixation Pisum sativum L Rhizobium Maternal effect |
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