scholarly journals Chlorophyll fluorescence and CO2 assimilation of black spruce seedlings following frost in different temperature and light conditions

2000 ◽  
Vol 20 (4) ◽  
pp. 249-255 ◽  
Author(s):  
M. Lamontagne ◽  
F. J. Bigras ◽  
H. A. Margolis
Keyword(s):  
Chlorophyll Fluorescence ◽  
Black Spruce ◽  
Co2 Assimilation ◽  
Light Conditions

Stomatal aperture can compensate altered stomatal density in Arabidopsis thaliana at growth light conditions

2006 ◽  
Vol 33 (11) ◽  
pp. 1037 ◽  
Author(s):  
Dirk Büssis ◽  
Uritza von Groll ◽  
Joachim Fisahn ◽  
Thomas Altmann
Keyword(s):  
Arabidopsis Thaliana ◽  
Stomatal Conductance ◽  
Stomatal Density ◽  
Co2 Assimilation ◽  
High Light ◽  
Stomatal Aperture ◽  
Photochemical Quenching ◽  
Light Conditions ◽  
Wild Type ◽  
Light Intensities

Stomatal density of transgenic Arabidopsis thaliana plants over-expressing the SDD1 (stomatal density and distribution) gene was reduced to 40% and in the sdd1-1 mutant increased to 300% of the wild type. CO2 assimilation rate and stomatal conductance of over-expressers and the sdd1-1 mutant were unchanged compared with wild types when measured under the light conditions the plants were exposed to during growth. Lower stomatal density was compensated for by increased stomatal aperture and conversely, increased stomatal density was compensated for by reduced stomatal aperture. At high light intensities the assimilation rates and stomatal conductance of SDD1 over-expressers were reduced to 80% of those in wild type plants. Areas beneath stomata and patches lacking stomata were analysed separately. In areas without stomata, maximum fluorescence yield (Fv / Fm) and quantum yield of photosystem II (Φ PSII) were significantly lower than in areas beneath stomata. In areas beneath stomata, Fv / Fm and Φ PSII were identical to levels measured in wild type leaves. At high light intensities over-expressers showed decreased photochemical quenching (qP) compared with wild types. However, the decrease of qP was significantly stronger in areas without stomata than in mesophyll areas beneath stomata. At high CO2 partial pressures and high light intensities CO2 assimilation rates of SDD1 over-expressers did not reach wild type levels. These results indicate that photosynthesis in SDD1 over-expressers was reduced because of limiting CO2 in areas furthest from stomata at high light.

scholarly journals Effects of nitrogen form on growth, CO2 assimilation, chlorophyll fluorescence, and photosynthetic electron allocation in cucumber and rice plants

2011 ◽  
Vol 12 (2) ◽  
pp. 126-134 ◽  
Author(s):  
Yan-hong Zhou ◽  
Yi-li Zhang ◽  
Xue-min Wang ◽  
Jin-xia Cui ◽  
Xiao-jian Xia ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Co2 Assimilation ◽  
Nitrogen Form ◽  
Rice Plants

Chlorophyll fluorescence of submerged and floating leaves of the aquatic resurrection plant Chamaegigas intrepidus

2004 ◽  
Vol 31 (1) ◽  
pp. 53 ◽  
Author(s):  
Markus Woitke ◽  
Wolfram Hartung ◽  
Hartmut Gimmler ◽  
Hermann Heilmeier
Keyword(s):  
Chlorophyll Fluorescence ◽  
Shade Tolerance ◽  
Photosynthetic Performance ◽  
Resurrection Plant ◽  
Photon Flux ◽  
Carbon Gain ◽  
Light Conditions ◽  
Total Plant ◽  
Floating Leaves

The role of submerged and floating leaves in plant photosynthetic performance of the aquatic resurrection plant Chamaegigas intrepidus Dinter was investigated by monitoring chlorophyll fluorescence under the fluctuating natural field conditions that characterise the extreme habitat of this species. The performance of the two different leaf types during desiccation–rehydration cycles in the field was examined. PSII quantum efficiency indicates a similar regeneration capacity in both leaf types after water stress. Electron transport rates under controlled light conditions were 3–4 times higher in floating leaves than in submerged leaves. The two leaf types showed specific adaptations to their ambient photosynthetic photon flux densities (PPFD), shade tolerance in the submerged leaves and adaptation to high PPFD in floating leaves. These results imply a significant role of the floating leaves for total plant carbon gain. It is concluded that the combination of high N content of floating leaves and a high availability of CO2 and light at the water surface contributes to the importance of this leaf type for photosynthesis in C. intrepidus.

scholarly journals CO2-assimilation and chlorophyll fluorescence as indirect selection criteria for host tolerance against Striga

Euphytica ◽  
2007 ◽  
Vol 160 (1) ◽  
pp. 75-87 ◽  
Author(s):  
Jonne Rodenburg ◽  
Lammert Bastiaans ◽  
Ad. H. C. M. Schapendonk ◽  
Peter E. L. van der Putten ◽  
Aad van Ast ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Selection Criteria ◽  
Co2 Assimilation ◽  
Indirect Selection ◽  
Host Tolerance

A comparison of CO2 and O2 exchange patterns and the relationship with chlorophyll fluorescence during photosynthesis in C3 and CAM plants

1998 ◽  
Vol 25 (1) ◽  
pp. 45 ◽  
Author(s):  
Kate Maxwell ◽  
Murray R. Badger ◽  
C. Barry Osmond
Keyword(s):  
Chlorophyll Fluorescence ◽  
Tca Cycle ◽  
Co2 Assimilation ◽  
Phase Iii ◽  
O2 Evolution ◽  
Co2 Uptake ◽  
Cam Plants ◽  
Co2 Diffusion ◽  
Oxygenase Activity ◽  
C3 Species

Patterns of CO2 and O2 exchange coupled to chlorophyll fluorescence were examined in the CAM plants Kalanchoe daigremontiana Hamet et Perr. and Hoya carnosa (L.f.) R.Br., and compared with the C3 species Sonchus oleraceus L. Patterns of CO2 assimilation during phase IV of CAM were as predicted for Rubisco-mediated atmospheric CO2 uptake in both CAM plants. The high energetic demand during decarboxylation (phase III) was reflected in a high, CO2-insensitive rate of gross O2 evolution. Uptake of external CO2 was significant during phase III and was not saturated at 1.5% CO2. Gross oxygen uptake in the light was CO2 sensitive in H. carnosa during phases III and IV, which suggests Rubisco oxygenase activity. Oxygen consumption comprised around 33% linear electron transport in K. daigremontiana during phase III (7.5 µmol O2 m-2 s-1 at saturating CO2), but we cannot yet distinguish whether this involves the Mehler reaction or TCA cycle and oxidative phosphorylation during deacidification. CO2 assimilation was saturated at 0.2% CO2 when the epidermis was removed in K. daigremontiana, suggesting a large stomatal and mesophyll resistance to CO2 diffusion. A linear relationship was obtained between the quantum yield of gross O2 evolution and the quantum efficiency of PSII.

scholarly journals Far-Red Chlorophyll Fluorescence Radiance Tracks Photosynthetic Carbon Assimilation Efficiency of Dark Reactions

2021 ◽  
Vol 11 (22) ◽  
pp. 10821
Author(s):  
Zhunqiao Liu ◽  
Chenhui Guo ◽  
Yanwen Bai ◽  
Nina Zhang ◽  
Qiang Yu ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Carbon Fixation ◽  
Stomatal Closure ◽  
Assimilation Efficiency ◽  
Carbon Assimilation ◽  
Pulse Amplitude ◽  
Light Conditions ◽  
Photosynthetic Carbon ◽  
Pam Fluorescence ◽  
Photosynthetic Carbon Assimilation

Solar-induced chlorophyll fluorescence (SIF) observations from space have shown close relationships with terrestrial photosynthesis rates. SIF originates from the light reactions of photosynthesis, whereas carbon fixation takes place during the dark reactions of photosynthesis. Questions remain regarding whether SIF is able to track changes in the efficiency of the dark reactions in photosynthesis. Using concurrent measurements of leaf-scale gas exchange, pulse amplitude-modulated (PAM) fluorescence, and fluorescence spectral radiances, we found that both far-red fluorescence radiances and PAM fluorescence yields responded rapidly to changes in photosynthetic carbon assimilation due to changes in environmental factors or induced stomatal closure under constant light conditions. Uncertainties in outgoing and incoming irradiance mismatch for SIF measurements may very likely obscure the contributions of the dark reactions, thereby causing the inconsistent findings previously reported, which were no change in far-red SIF and PAM fluorescence yields after clear reductions in the photosynthetic carbon assimilation efficiency of dark reactions. Our results confirm that high-quality SIF measurements have the potential to provide insights into the dark reactions of photosynthesis. This study is particularly relevant for better interpreting satellite SIF observations that are obtained under roughly constant overpass times and relatively stable light intensities.

Cold-induced photoinhibition and foliar pigment dynamics of Eucalyptus nitens seedlings during establishment

2001 ◽  
Vol 28 (11) ◽  
pp. 1133 ◽  
Author(s):  
Dugald C. Close ◽  
Chris L. Beadle ◽  
Mark J. Hovenden
Keyword(s):  
Chlorophyll Fluorescence ◽  
Protein Complexes ◽  
Photochemical Quenching ◽  
Eucalyptus Nitens ◽  
Light Conditions ◽  
National Academy Of Sciences ◽  
Experimental Site ◽  
Chlorophyll Fluorescence Parameters ◽  
Non Photochemical Quenching ◽  
Academy Of Sciences

The effects of cold-induced photoinhibition on chlorophyll and carotenoid dynamics and xanthophyll cycling in Eucalyptus nitens (Deane and Maiden) Maiden were assessed between planting and 32 weeks after planting. The seedlings were fertilised or nutrient-deprived (non-fertilised) before planting and shaded or not shaded after planting. The experimental site was 700 m a.s.l., which is considered marginal for establishment of E. nitens plantations in Tasmania due to low mean annual minimum temperatures. Low temperature–high light conditions caused a reduction in variable to maximal chlorophyll fluorescence ratio (F v /F m ), which was more pronounced in non-fertilised than in fertilised seedlings. Shadecloth shelters alleviated this depression. Except in shaded fertilised seedlings, F v /F m did not recover to the level before planting until after 20 weeks. Total chlorophyll content was initially reduced in shaded treatments but subsequently increased with increasing temperatures and F v /F m. Total xanthophyll content and xanthophylls per unit chlorophyll remained relatively constant in fertilised seedlings but decreased in non-fertilised seedlings within 2 weeks after planting. Total xanthophyll and xanthophylls per unit chlorophyll subsequently recovered in non-shaded, non-fertilised seedlings with increasing temperatures and F v /F m. Diurnal [yield and non-photochemical quenching (NPQ) and seasonal (F v /F m) variation in chlorophyll fluorescence parameters were not reflected in xanthophyll cycling during the period of most severe photoinhibition. This result may indicate that chlorophyll–xanthophylls protein complexes form in winter-acclimated E. nitens foliage as have been demonstrated to occur in Eucalyptus pauciflora Sieb. ex Spreng. (Gilmore and Ball 2000, Proceedings of the National Academy of Sciences USA 97, 11098–11101).

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