Overview: Perspectives in Ecophysiological Research of Photosynthesis

Schulze, Ernst Detlef; Caldwell, M. M.

doi:10.1007/978-3-642-79354-7_26

Cited by 10 publications

(14 citation statements)

References 18 publications

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“…The higher protein content in the exposed P. neesii is possibly due to the presence of higher amounts of ribulose bisphosphate carboxylase oxygenase (Rubisco) in the leaves. It has been well documented that the enzyme can make up 25% of leaf protein in plants (Heldt, 2005) and is associated with the high photosynthetic rates observed in sun plants at light saturation (Schulze & Caldwell, 1994). It is consistent with earlier findings in sun and shade plants (Boardman, 1977;Nasrulhaq-Boyce & Mohamed, 1987).…”

Section: Discussionsupporting

confidence: 90%

“…However, little data are available with regard to mosses with the exception of the recent work by Marschall & Proctor (2004) and Proctor (2005) on bryophytes collected from England, USA, and Venezuela. Furthermore, lichens and bryophytes have the characteristics of C3 plants and their net photosynthetic rates are much lower (around 20-100 times less) than those in other plants (Schulze & Caldwell, 1994;Martin & Adamson, 2001;Marschall & Proctor, 2004). Our study of the in vitro Photosystem II photochemical activities of isolated chloroplasts of Pogonatum and the in vivo CO 2 assimilation activities in leaves, revealed low rates consistent with those observed in other bryophytes.…”

Section: Discussionsupporting

confidence: 76%

“…As it has been well documented, particularly for higher plants (Boardman, 1977;Schulze & Caldwell, 1994), that shade plants have greater chlorophyll content than their sun counterparts, it was interesting to investigate this phenomenon in Malaysian Pogonatum. As shown in Table 3, the total chlorophyll content in the deeply shaded and dark-green colored P. cirratum subsp.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, their chloroplasts are larger and fewer in numbers compared to their sun counterparts (Boardman, 1977;Schulze & Caldwell, 1994). In addition to this shade plant chloroplasts have large grana stacks which can contain as many as 50-200 thylakoids per granum (Nasrulhaq-Boyce & Duckett, 1991;Duckett & Ligrone, 1993;Sheue et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

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Comparative morphological and photosynthetic studies on three Malaysian species ofPogonatumfrom habitats of varying light irradiances

Nasrulhaq-Boyce

Mohamed

Lim

et al. 2011

Journal of Bryology

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Comparative morphological and physiological studies were carried out on three species of Malaysian Pogonatum collected from habitats exposed to different light intensities ranging from 28¡4 W/m 2 for P. cirratum subsp. macrophyllum (Dozy & Molk.) Hyvö nen, to 230¡39 W/m 2 for P. subtortile (Mü ll.Hal.) A. Jaeger to 751¡45 W/m 2 for P. neesii (Mü ll.Hal.) Dozy. Total chlorophyll and beta-carotene content were higher in P. cirratum subsp. macrophyllum and P. subtortile than in P. neesii when calculated on a fresh weight basis. However, soluble protein content was higher in the sun species compared to its shadeadapted counterparts, and the soluble protein to total chlorophyll ratio was highest in P. neesii. The chloroplasts in the leaves of P. cirratum subsp. macrophyllum were significantly larger than those in the other two species, and had more grana and thylakoids per chloroplast profile. The numbers of starch grains in P. cirratum subsp. macrophyllum and P. subtortile were more than double that observed in P. neesii. Morphological studies of the leaves showed specific differences in the shapes and heights of the lamellae found on the adaxial surfaces of the leaves. The lamellae of P. cirratum subsp. macrophyllum were rudimentary whilst those of P. subtortile were 2-3 cells high and P. neesii possessed lamellae 5-7 cells high. These findings indicate a direct correlation between the height of the lamellae and the light irradiances received by the plants. Determination of the in vitro Photosystem II photochemical rates, with an oxygen electrode, of chloroplasts isolated from these plants, showed that P. neesii and P. subtortile exhibited higher rates than P. cirratum subsp. macrophyllum. Similarly in vivo light saturation studies with an infrared gas analyzer showed that CO 2 assimilatory rates were highest in P. neesii, even at low light intensities, suggesting a relationship between photosynthesis and light irradiance in these mosses that is different from vascular plants.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative morphological and photosynthetic studies on three Malaysian species ofPogonatumfrom habitats of varying light irradiances

Nasrulhaq-Boyce

Mohamed

Lim

et al. 2011

Journal of Bryology

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“…The link between molecular biology and ecology will be strengthened and, by using molecular tools, much progress can be made beyond simply correlative evidence. Species-specific interactions in ecosystem function will remain a major challenge (Schulze and Caldwell, 1995). It is necessary more experimental evidence on plant response at high CO2 under a range of a field conditions.…”

Section: Predicting the Future Response Of Plants And Ecosystemsmentioning

confidence: 99%

Perspectives of forest ecophysiological research in the context of Mediterranean Basin

Fernández

Tapias

2005

For. syst.

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The mediterranean-climate regions are linked to the presence of the unusual global conditions of cool rainy winters and warm dry summers. Thus, the common drought periods, frost nights, summer heat and fires and soil erosion disturb plants life. These regions have a global significance by their floristic richness. Nevertheless, these areas have been more heavily impacted by human activities than almost any other ecosystem. The foreseeable global change will most likely influence plant life, and the Mediterranean Basin will be specially affected (e.g. a decrease in spring and winter rainfalls, an increase in mean annual temperature), affecting the delicate equilibrium of these ecosystems. Ecophysiology is a powerful tool to examine the controlling mechanisms behind the functioning, distribution, abundance, and productivity of forest tree species and their response to a changing environment. This science discipline can help to the forest management by physiological approaches of the response of plant processes to the biotic and abiotic constraints imposed by the environment.Key words: Tree research, forest ecosystems, plant physiological ecology. ResumenPerspectivas en la investigación ecofisiológica forestal en el contexto de la cuenca mediterráneaLas regiones de clima mediterráneo se caracterizan por presentar las precipitaciones concentradas en la época fría y veranos secos y calurosos. Ello conduce a la frecuente aparición de períodos de sequía, heladas, altas temperaturas estivales, fuegos forestales y fenómenos de erosión edáfica que afectan la vida de las plantas. Estas regiones poseen una alta riqueza florística de importancia mundial, pero son ecosistemas altamente influenciados por la actividad humana a lo largo de la historia y su delicado equilibrio puede verse afectado aún más si se cumplen las previsiones de cambio climático (aumento de temperaturas, disminución de precipitaciones, oscurecimiento global, etc.). Por tanto, la gestión y manejo de los sistemas forestales precisa de un mayor conocimiento del funcionamiento de las especies y de la respuesta de éstas ante las nuevas condiciones ambientales venideras, así como del resto de factores bióticos y abióticos que limitan el crecimiento de las plantas. Para ello la ecofisiología, a través del mejor conocimiento de los procesos fisiológicos vegetales, permitirá conocer el funcionamiento, distribución, abundancia y productividad de los ecosistemas forestales mediterráneos.Palabras clave: ecofisiología vegetal, investigación forestal, ecosistemas mediterráneos, investigación en especies arbóreas.

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