Abstract
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.
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Abbreviations
- ABA:
-
abscisic acid
- Chl:
-
chlorophyl
- g s :
-
stomatal conductance
- P N :
-
net photosynthetic rate
- WT:
-
wild type
- WUEi :
-
intrinsic water-use efficiency
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Acknowledgements: We thank Jan Hlavinka for SPAD measurement of the chlorophyll content. This work was supported by the Czech Science Foundation (project No. 522/08/H003 and P501/10/0785), by grant No. ED0007/01/01 (Centre of the Region Haná for Biotechnological and Agricultural Research) and by the Ministry of Education of the Czech Republic (project No. MSM6198959215).
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Ježilová, E., Fellner, M., Bergougnoux, V. et al. Is the rate of photosynthesis under blue light altered in the 7B-1 tomato mutant?. Photosynthetica 50, 477–480 (2012). https://doi.org/10.1007/s11099-012-0047-1
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DOI: https://doi.org/10.1007/s11099-012-0047-1