Developmental responses to sowing date in wheat, barley and rapeseed

摘要: Abstract Two cultivars of each bread wheat ( Triticum aestivum L.), malting barley Hordeum vulgare L.) and spring rapeseed Brassica napus were grown in a wide range different sowing dates Buenos Aires, Argentina. The aims this study (i) to analyse how the number leaf primordia rate emergence interact modify duration pre-flowering phases (ii) establish yield components initiated during those are affected when these modified by dates. results showed interactions between photoperiod temperature for producing combination length phases. Barley reached floral initiation earlier than had shorter ‘intrinsic earliness’. Plastochron phyllochron varied among three species. In most cases relationship cumulative leaves on main shoot thermal time was describe bilinear model with emerging faster later ones. However, opposite pattern observed which slower first lasts leaves. changes throughout plant ontogeny, might delay or hasten reproductive phase spikes grow some floret becoming fertile. Extending stem elongation produced more fertile florets per spikelets.