Efectos del ambiente materno sobre la salida de la dormición en semillas de Polygonum aviculare

ROCIO BELÉN FERNANDEZ; BATLLA, DIEGO; BENECH-ARNOLD, ROBERTO

Congreso; XXXI Reunion Argentina de Fisiología Vegetal; 2016

As several weed seed populations showdormancy, the possibility of predicting theiremergence in the field depends on ourknowledge of dormancy dynamics. Althoughafter-shedding regulation of dormancy has beenwidely studied and modelled, less work hasfocused on maternal effects on dormancybehavior and there is almost no attempt toinclude these effects on predictive models ofseedling emergence. We studied the effects of (i)mother plants flowering-time and (ii) photoperiodduring seed-development and maturation ondormancy release of Polygonum aviculare seeds.To study the influence of (i), we carried outplantings under field conditions in contrastingdates. To study (ii), plants were grown undernatural and extended (+4hs) photoperiodconditions. Collected seeds (from i and ii) wereburied in pots andstored at 1.6, 5 and 9.8°C. At different timesduring storage, seeds were exhumed andgermination was tested at 10, 15, 20, 25 and10/24ºC. Dormancy release and, hence,germination patterns were significantly affectedby seed-maturation conditions. An increase indormancy loss rate related to a faster decreaseof the lower limit temperature for germinationwith delay in planting date and short-dayconditions was observed. Mathematical modelsfor dormancy loss which include these effectswere developed.