Changes in Photosynthesis in Inbred Maize Lines with Different Degrees of Chilling Tolerance Grown at Optimum and Suboptimum Temperatures |
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Authors: | Janda T Szalai G Ducruet J-M Páldi E |
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Institution: | (1) Agricultural Research Institute of the Hungarian Academy of Sciences, H-2462 Martonvásár, POB 19, Hungary;(2) Section de Bioénergétique, DBCM, INRA/CEA Saclay, 91191 Gif-sur-Yvette Cedex, France |
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Abstract: | The effects of growth temperature on changes in net photosynthetic rate (PN) and the chlorophyll fluorescence induction parameter Fv/Fm were investigated after cold stress in inbred maize lines with different degrees of cold tolerance. There was no significant difference between lines grown at optimum temperatures of 25/23 and 20/18 °C as regards PN and Fv/Fm determined at the growth temperature, but these parameters were lower for plants grown at a suboptimum temperature of 15/13 °C. After cold treatment, the decrease in PN was more pronounced in chilling-sensitive lines. The higher the growth temperature was, the more pronounced decrease occurred in PN and Fv/Fm. Thus at low growth temperature both damaging and adaptive processes occur. |
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Keywords: | chlorophyll fluorescence gas exchange intercellular CO2 concentration low temperature stress stomatal conductance Zea mays |
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