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Influence of long days on the post vernalization period floral primordium in winter wheat cultivar remeco inta



Influence of long days on the post vernalization period floral primordium in winter wheat cultivar remeco inta



Phyton (Buenos Aires) 40(2): 159-168



The effect of 2 photoperiods [8 h (SD) [short day] and 16 h (LD) [long day]] on the time elapsed from the end of vernalization to double ridge formation, was studied in winter rye cv. Remeco INTA. Exposure of plants from 2 up to 7-12 LD lengthened the vegetative period and delayed the beginning of the reproductive stage. Exposure to more LD shortened the vegetative period even below that of the control in SD conditions. The delay and hastening effect always take place in this order. at any age. Evidently, at the beginning, long photoperiods (from 2 up to 7-12 LD) induce the synthesis of a compound(s) that inhibits the activity or the synthesis of the floral primordia compound(s). This action would be reversed by promoting compounds synthesized under short photoperiods and in a greater amount under a larger number of long photoperiods.

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