Photosynthetica 2012, 50(3):477-480 | DOI: 10.1007/s11099-012-0047-1

Is the rate of photosynthesis under blue light altered in the 7B-1 tomato mutant?

E. Ježilová1, M. Fellner2, V. Bergougnoux2,3, M. Špundová1,*
1 Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Biophysics, Faculty of Science, Palacký University, Olomouc, Czech Republic
2 Group of Molecular Physiology, Laboratory of Growth Regulators, Palacký University & Institute of Experimental Botany ASCR, Olomouc, Czech Republic
3 Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Molecular Biology, Faculty of Science, Palacký University, Olomouc, Czech Republic

Changes of photosynthesis under blue light were examined in the ABA-overproducing 7B-1 mutant in tomato. Net photosynthetic rate (P N), stomatal conductance (g s), intrinsic water-use efficiency (WUEi) and chlorophyll (a+b) [Chl (a+b)] content in leaves of different insertion (1st, 4th and 9th ones) were measured in 5-, 7- and 9-week-old plants. P N, g s, and Chl (a+b) content were mostly similar in young leaves of 7B-1 and wild type (WT) plants. With the aging of leaves, a blue-light-induced increase in P N and g s to steady-state was delayed and steady-state values of P N and g s were lower in 7B-1 plants compared with WT. Steady-state values of WUEi were increased in 4th and 9th leaves of 7B-1 plants compared with WT. The results can be explained by the higher endogenous level of ABA in 7B-1 plants and their lower sensitivity to ABA in earlier growth stage.

Keywords: ABA-overproducer; chlorophyll content; net photosynthetic rate; Solanum lycopersicum; stomatal conductance; tomato mutant

Received: April 6, 2012; Accepted: June 1, 2012; Published: September 1, 2012Show citation

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Ježilová, E., Fellner, M., Bergougnoux, V., & Špundová, M. (2012). Is the rate of photosynthesis under blue light altered in the 7B-1 tomato mutant? Photosynthetica, 50(3), 477-480. doi: 10.1007/s11099-012-0047-1.
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