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Relationship Between Productivity and Phosphate Requirement as a Parameter of Selection in Medicago rigidula (L.) Allioni
Author(s) -
Lorenzetti Sllvia,
Scarponi L.,
Perucci P.,
Falcinelli M.
Publication year - 1992
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.1992.tb00177.x
Subject(s) - dry matter , phosphorus , biology , phosphate , productivity , nutrient , medicago , botany , selection (genetic algorithm) , medicago sativa , agronomy , chemistry , biochemistry , ecology , macroeconomics , organic chemistry , gene , economics , artificial intelligence , computer science
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 P 2 O 5 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 P 2 O 5 and to check if superior lines could also be isolated when plants were grown at 20 and 200 mg L ‐1 of P 2 O 5 . 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.