Combined Effects of Elevated Temperature and Carbon Dioxide on Geometry of Maize Leaves

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An accurate prediction of variations in water consumption from a field and in the crop growth affected by the climate change due to global warming is important for the countinuous agricultural activities. Components of water consumption in a farmland, i.e. transpiration from the crop surface and evapotation from the soil surface, are influenced by the structure of crop canopy. In this study, the combined effects of elevated temperature and carbon dioxine concentration on the geometry and longevity of leaves of maize were examined through an experiment with growth chambers. Three treatments,i.e. TLCL(air temperature day/night:28/22℃, CO2 concentration:350 ppm), TLCH (28/22℃, 750ppm), and THCH (32/36℃, 750ppm), were performed in different closed chamber respectively, and sixteen of maize (Zea mays L. cv. Pioneer G-98) planted in a pot were grown in each treatment. The cumulative thermal time from emergence of plot until the expansion of the i th leaf became larger in the order,TLCH<TLCL<THCH. The longevity of the ith leaf became longer in the order,TLCL<TLCH<THCH. Area of the ith leaf in THCH was clearly smaller then that in TLCL and TLCH.