Relationship Between Productivity and Phosphate Requirement as a Parameter of Selection in Medicago rigidula (L.) Allioni |
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| Authors: | Sllvia Lorenzetti L Scarponi P Perucci M Falcinelli |
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| Institution: | Istituto di Miglioramento Genetico Vegetale, Universitàdegli Studi di Perugia, Facoltàdi Agraria, Borgo XX Giugno 74, 1-06100 Perugia, Italy;Istituto di Chimica Agraria, Universita degli Studi di Perugia, Facoltàdi Agraria, Borgo XX Giugno 74, 1-06100 Perugia, Italy. |
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| Abstract: | Among one hundred lines of Medicago rigidula (L.) Allioni, fifteen (5 high-producing, HP, 5 intermediate-producing, IP, and 5 low-producing, LP) were chosen as experimental material because of their different dry-matter production when grown at 0.5 mg L-1 of P2O5 in hydroponic solution (critical level). The aim of this work was to evaluate the response to selection with respect to dry-matter yield (DMY), made at 0.5 mg L-1 of P2O5 and to check if superior lines could also be isolated when plants were grown at 20 and 200 mg L-1 of P2O5. Results show that HP lines were also superior with respect to DMY (g/plant) at the higher phosphorus concentrations. Highly-productive line selection in M. rigidula can also be achieved when plants are grown at a critical level of phosphorus in the nutrient solution. Phosphate content in the dry matter produced and phosphatase activity were also analysed. Plants of the more-productive lines were characterized by lower phosphate content per unit dry matter and by a higher phosphatase activity. |
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| Keywords: | Medicago rigidula annual medic phosphate uptake phosphatase activity productivity |
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