AOBPreview originally published online on October 23, 2009
Annals of Botany 2009 104(7):1435-1444; doi:10.1093/aob/mcp257
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Photosynthetic acclimation is important for post-submergence recovery of photosynthesis and growth in two riparian species
1 Institut für Phytosphäre, ICG-3, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
2 Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Southwest University, Chongqing 400715, P.R. China
* For correspondence. Email s.matsubara{at}fz-juelich.de
Received: 5 June 2009 Returned for revision: 19 August 2009 Accepted: 14 September 2009 Published electronically: 23 October 2009
Background and Aims: Concomitant increases in O2 and irradiance upon de-submergence can cause photoinhibition and photo-oxidative damage to the photosynthetic apparatus of plants. As energy and carbohydrate supply from photosynthesis is needed for growth, it was hypothesized that post-submergence growth recovery may require efficient photosynthetic acclimation to increased O2 and irradiance to minimize photo-oxidative damage. The hypothesis was tested in two flood-tolerant species: a C3 herb, Alternanthera philoxeroides; and a C4 grass, Hemarthria altissima. The impact of low O2 and low light, typical conditions in turbid floodwater, on post-submergence recovery was assessed by different flooding treatments combined with shading.
Methods: Experiments were conducted during 30 d of flooding (waterlogging or submergence) with or without shading and subsequent recovery of 20 d under growth conditions. Changes in dry mass, number of branches/tillers, and length of the longest internodes and main stems were recorded to characterize growth responses. Photosynthetic parameters (photosystem II efficiency and non-photochemical quenching) were determined in mature leaves based on chlorophyll a fluorescence measurements.
Key Results: In both species growth and photosynthesis recovered after the end of the submergence treatment, with recovery of photosynthesis (starting shortly after de-submergence) preceding recovery of growth (pronounced on days 40–50). The effective quantum yield of photosystem II and non-photochemical quenching were diminished during submergence but rapidly increased upon de-submergence. Similar changes were found in all shaded plants, with or without flooding. Submerged plants did not suffer from photoinhibition throughout the recovery period although their growth recovery was retarded.
Conclusions: After sudden de-submergence the C3 plant A. philoxeroides and the C4 plant H. altissima were both able to maintain the functionality of the photosynthetic apparatus through rapid acclimation to changing O2 and light conditions. The ability for photosynthetic acclimation may be essential for adaptation to wetland habitats in which water levels fluctuate.
Key words: Aerenchyma, Alternanthera philoxeroides, flooding, growth, Hemarthria altissima, low light, photosynthesis, shade, submergence, waterlogging, wetland plant
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