Experimental Agriculture · 1971 · 27 citations · 6 references
AgricultureCrop SciencesPlant SciencesCrop PhysiologyCrop ProductionPhysiological EcologyAgricultural Climate AdaptationCereal BreedingCereal Crop PhysiologyGrain Filling PhysiologyTemperature PhysiologyTemperature ResponsesCritical TemperatureEar EmergenceFloral InitiationGrain Filling Under Stress ConditionsHeat Stress In CropsNet Assimilation RateTemperature Effects On Grain FillingTemperature Extremes In Crops
SUMMARY Under controlled environment conditions a semi-dwarf wheat, Mexico 120, was subjected to temperature regimes representative of the extremes that occur during the dry (winter) season of the Ord River valley in northern Australia. High temperatures (35°C by day: 18°C by night) such as occur at the beginning and end of the dry season were compared with low temperatures (30°C by day: 13°C by night) such as occur in mid-season. Day length was constant at 12 hours. High temperatures from floral initiation onwards adversely affected floret development, and after ear emergence reduced grain filling to nil. Net assimilation rates were reduced by high temperatures. Major effects on yields were caused by high temperatures well before anthesis. The critical temperature after anthesis is apparently between 32° and 35°C.
6