Vernalization and Photoperiod Requirement of Naturalized Avena fatua and Avena barbata Pott Ex Link in Western Australia

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Abstract
All accessions of A. fatua required little vernalization and were therefore suited to the warm northerly areas of temperate Western Australia. Accessions of A. barbata from southerly latitudes had a strong vernalization requirement but northerly accessions did not. Response to photoperiod in A. fatua was confined to accessions from the south. All accessions of A. barbata responded to photoperiod but those from the south required a longer photoperiod than those from the north. A. fatua was more tolerant of frosting than A. barbata. Differences in response to temperature and photoperiod are largely responsible for the geographic distribution of the 2 spp. in Western Australia.