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| Sex-specific light acclimation of Chara canescens (Charophyta) Küster, A.; Schaible, R.; Schubert, H. (2005). Sex-specific light acclimation of Chara canescens (Charophyta). Aquat. Bot. 83(2): 129-140. http://dx.doi.org/10.1016/j.aquabot.2005.05.009
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770; e-ISSN 1879-1522
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Chemical compounds > Organic compounds > Carbohydrates > Glycosides > Pigments Chemical reactions > Photochemical reactions > Photosynthesis Irradiance Reproduction > Parthenogenesis Chara canescens Loiseleur, 1810 [WoRMS]; Charophyta [WoRMS] Neusiedler See [Marine Regions] Zoet water |
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 7 mg FW) up to 500 µmol photons m-2 s-1 (27 mg FW) in female and male C. canescens. The irradiance saturation point for photosynthesis (Ek) was about 140 µmol m-2 s-1 for both sexes within the whole range of acclimation irradiances. The maximum photosynthesis rate at saturating irradiances (Pmax) of male algae was highest at Ek, whereas Pmax of female algae was highest at 500 µmol photons m-2 s-1. The photosynthetic efficiency in the light-limited range (a) increased in female C. canescens and decreased in male C. canescens. The ratio of the non-photochemical quenching parameter (NPQ) to the relative electron transport rates rETR(MT) increased in both sexes with irradiance, but showed a steeper increase in male than in female algae. Pigment analysis showed similar acclimation pattern for male and female C. canescens. Chl a/Chl b ratios of both sexes were constant over the whole range of Eg, whereas Chl a/carotenoid ratios in male and female C. canescens decreased from 70 µmol photons m-2 s-1 upwards. Pigment analysis pointed out that the carotenes a-, ß- and ?-carotene were more prominent in male than in female algae. Our results indicate that female C. canescens are more efficient in light acclimation than male algae from the same site. Nevertheless, further investigations of bisexual C. canescens populations resolving CO2-uptake mechanisms and/or genetic differences are needed. |
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