. 2013. Night-time warming affects N and P dynamics and productivity of winter wheat plants. Can. J. Plant Sci. 93: 397Á406. The daily night-time temperature has currently increased faster than the daily daytime temperature over much of the Earth's surface. To understand how night-time warming affects the dynamics of winter wheat performance, open-field experiments, in which temperatures were elevated by covering the plots at night with reflective curtains, were conducted in the 2010/2011 and 2011/2012 growing seasons. The results show that, on average, night-time temperatures increased by 0.98C under night-time covered (NC) treatment compared with the uncovered (CK). Plant total N accumulation was 17Á43% higher in NC treatment than CK during the jointing, anthesis and ripening stages, whereas plant total P was affected by NC treatment depending on growing stage. Night-time covered treatment substantially decreased N translocation efficiency, leading to more N retained in plant stems during grain filling. Although P translocated to grain was 29Á41% higher in NC plots than CK plots, NC treatment decreased post-anthesis P uptake by 27Á41%, depending on the growing season, resulting in evident reduction of P harvest index and P utilization efficiency. When night-time temperature increased, grain yield was reduced by 6Á25% due to a combination of decreased productive spikes, a lower number of kernels per spike and reduced weight of grain per kernel.Key words: Night-time warming, nitrogen, phosphorus, Triticum aestivum L.Zhang, Y., Li, R. et Wang, Y. 2013. Le re´chauffement nocturne affecte la dynamique du N et du P ainsi que la productivite´du ble´d'hiver. Can. J. Plant Sci. 93: 397Á406. La tempe´rature a augmente´beaucoup plus rapidement la nuit que le jour sur une grande partie de la plane`te. Pour comprendre comment le re´chauffement nocturne affecte la dynamique du rendement chez le ble´d'hiver, les auteurs ont proce´de´a`des expe´riences au champ qui consistaient a`augmenter la tempe´rature en recouvrant les parcelles avec du tissu re´fle´chissant, la nuit. Les expe´riences se sont de´roule´es durant la pe´riode ve´ge´tative de 2010Á2011 et de 2011Á2012. Les re´sultats indiquent que la tempe´rature nocturne augmente en moyenne de 0,98C avec la couverture. L'accumulation de N total est de 17 a`43 % plus e´leve´e chez les plants recouverts que chez les plants te´moins qui ne l'e´taient pas, pendant la montaison, l'anthe`se et le muˆrissement; la couverture nocturne affecte la concentration totale de P en fonction du stade de croissance. Le recouvrement nocturne diminue sensiblement l'efficacite´de la translocation du N, si bien qu'une plus grande partie du N demeure dans la tige pendant le remplissage du grain. Bien qu'on observe une plus grande (de 29 a`41 %) translocation du P chez les plants couverts que chez les te´moins, le recouvrement nocturne diminue l'absorption du P de 27 a`41 % apre`s l'anthe`se, selon la pe´riode ve´ge´tative, ce qui entraıˆne une re´duction e´vidente de l'indice du P a`la moisson ain...