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The current increase in atmospheric CO_2 concentration [CO_2] and the predicted increases in global surface air temperature have stimulated the need for understanding the response of agricultural crop...s to [CO_2] and temperature interactions. The objectives of this study were to evaluate the effects of ambient and doubled [CO_2] at a range of temperatures on leaf initiation rates, expansion rates, and final sizes of cotton leaves. Cotton plants (Gossypium hirsutum L., cv. DPL-50) were grown in a nearly natural environment using daylit plant growth chambers with temperature and [CO_2] as controlled variables. The average air temperatures were 17.8, 18.7, 22,7, 26.6, and 30.6℃ during a 70-d experimental period with [CO_2] treatments of 350 and 700μLL^<-1> at each temperature. Leaf initiation, expansion, and final sizes were recorded at daily or weekly time intervals as needed. Temperature and [CO_2] had significant effects on expansion and final sizes of the mainstem leaves on the cotton plant. There was no significant effect of [CO_2] on leaf initiation rates. Temperature affected the final leaf sizes, duration of expansion, and rate of expansion. High [CO_2] increased final leaf size and rate of leaf expansion, and the effect was more pronounced at higher temperatures. The increase in whole plant leaf area with doubling of [CO_2] was due to small increases in individual leaf sizes and a large increase in the number of leaves on fruiting and vegetative branches.show more
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Export Mendeley
KJ00004506830