Enhancement in leaf photosynthesis and upregulation of Rubisco in the C4 sorghum plant at elevated growth carbon dioxide and temperature occur at early stages of leaf ontogeny

Functional Plant Biology : FPB
P V Vara PrasadLeon H Allen

Abstract

Rising atmospheric carbon dioxide (CO2) concentration and temperature will influence photosynthesis, growth and yield of agronomic crops. To investigate effects of elevated CO2 and high temperature on leaf gas exchanges, activities of Rubisco and phosphoenolpyruvate carboxylase (PEPC) and growth of grain sorghum (Sorghum bicolor L. Moench), plants were grown in controlled environments at day-time maximum/night-time minimum temperatures of 30/20°C or 36/26°C at ambient (350 µmol mol-1) or elevated (700 µmol mol-1) CO2. Gas-exchange rates, activities of Rubisco and PEPC and growth parameters (leaf, stem and total dry weights) were determined at different stages of leaf development. Between 6 and 25 days after leaf tip emergence, leaf carbon exchange rate (CER) of elevated CO2 plants was greater at 30/20°C and 36/26°C than that of ambient CO2 plants at the same temperatures. The positive response of CER to elevated CO2 was greater in young leaves than in old leaves. In young leaves, elevated CO2 enhanced Rubisco activity at 30/20°C and 36/26°C, whereas PEPC activity was not affected by elevated CO2 at 30/20°C but was marginally enhanced at 36/26°C. At 30/20°C, growth parameters were not affected by elevated CO2 until 50 days after...Continue Reading

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Citations

May 1, 2013·Functional Plant Biology : FPB·Chuc T NguyenGraeme L Hammer
Jan 6, 2011·Journal of Integrative Plant Biology·Caitlin S ByrtRobert T Furbank
Jun 12, 2013·Photosynthesis Research·Jeroni GalmésJaume Flexas
Aug 29, 2012·The New Phytologist·Florent PantinBertrand Muller
Nov 19, 2020·Plants·Renan Gonçalves da SilvaSonia Marli Zingaretti

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