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Geographical distribution ecology and cyanogenesis polymorphism in lotus corniculatus l. and lotus alpinus dc schleicher from south west france



Geographical distribution ecology and cyanogenesis polymorphism in lotus corniculatus l. and lotus alpinus dc schleicher from south west france



Journal of Natural History 20(6): 1435-1442



Chromosome numbers and cyanogenesis were studied in 22 French populations of Lotus corniculatus/L. alpinus from the South-west Alps. L. coniculatus with 2n = 24 and L. alpinus with 2n = 12 proved to be polymorphic for cyanogenesis. The highest frequencies of HCN+ individuals were generally found upon carbonate, in open vegetation and at high altitude. However, populations studied from various substrata in the upper valley of the Var consistently comprised fewer cyanogenic plants than the colonies occurring further to the south. The authors suggest that this distribution pattern might be influenced by the occurrence of ancestral populations of L. alpinus at Mount Ventoux and the Mountain of Lure.

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