Relationship between net photosynthesis and leaf respiration in Mediterranean evergreen species

Gratani, Loretta; Varone, Laura; Catoni, Rosangela

doi:10.1007/s11099-008-0095-8

Cited by 36 publications

(29 citation statements)

References 38 publications

(27 reference statements)

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“…This pattern of double climatic stress is consistent with some of the functional parameters measured in the species Quercus ilex L., which is the dominant evergreen oak tree species in the Western Mediterranean Basin (Barbero et al 1992). First, Q. ilex presents two peaks of photosynthetic activity in spring and autumn (Gratani 2000;Corcuera et al 2005;Gratani et al 2008) like other Mediterranean species (Llorens et al 2003), coinciding with periods of high precipitation and mild temperatures. Second, shoot elongation and leaf flushing in Q. ilex mainly occur in spring, and stop in summer, while a new flush can occur in late-summer or early autumn after rainfall, especially at coastal sites (Gratani 1996;Castro-Díez and MontserratMartí 1998;Montserrat-Martí et al 2009).…”

Section: Introductionsupporting

confidence: 79%

Climate controls act at different scales on the seasonal pattern of Quercus ilex L. stem radial increments in NE Spain

Gutiérrez

Campelo

Camarero

et al. 2011

Trees

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Long-term data on radial increment dynamics in Mediterranean species may identify which climatic variables are the main constraints for radial growth and at which temporal scales they act. To this end, we examined stem radial fluctuations in Quercus ilex L., the dominant evergreen oak species in the Western Mediterranean Basin, over a period of 11 years (1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004) at a coastal site in north-eastern Spain. We used manual band dendrometers to record girth changes in trees on north-and south-facing slopes. Annual increments measured by dendrometers showed good agreement with annual tree-ring width. North-facing trees showed a lower long-term cumulative radial increment than south-facing trees. The seasonal radial increment pattern of Q. ilex was bimodal, being characterized by a greater increase in May and a lesser, more variable increase peak in September. Both phases corresponded to warm and moist climatic conditions, whereas radial increase of stems stopped in winter and occasionally in summer. Considering the whole year, mean maximum air temperature was the main factor positively affecting radial increment of Q. ilex from short-(5 days) to-long (30 days) time scales, whereas the accumulated precipitation exerted a similar effect at longer (30 days) scales, but only on south-facing trees. In summer, all trees were positively correlated with precipitation at long-time scales (30 days); however, only stem increment of southfacing trees showed a significant relation to the temperature at short-time scales (10 days). We confirmed the dominant role of temperature as the major constraint on radial increment at short time scales, despite most previous studies were mostly biased towards precipitation effects at monthly scales.

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Section: Introductionsupporting

confidence: 79%

Climate controls act at different scales on the seasonal pattern of Quercus ilex L. stem radial increments in NE Spain

Gutiérrez

Campelo

Camarero

et al. 2011

Trees

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“…ATP). (Armstrong et al 2006;Gratani et al 2008b). As leaf expansion progresses leaf dark respiration decreases reaching a steady-state value (4.2 ± 0.5 lmol CO 2 m -2 s -1 ) 34 days after bud break when leaf area was 58% of the its final size underlining that growth may be supported by the photosynthates produced by the new expanding leaves (Turgeon 1989;Miyazawa et al 2003).…”

Section: Rhamnus Alaternusmentioning

confidence: 98%

Leaf expansion in Rhamnus alaternus L. by leaf morphological, anatomical and physiological analysis

Varone

Gratani

2009

Trees

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Morphological, anatomical and physiological traits of Rhamnus alaternus during leaf expansion were analysed. Bud break occurred when mean air temperature was 14.1 ± 1.2C, and it was immediately followed by the increase of leaf area and leaf dry mass. The highest leaf expansion rates happened during the first 22 days of the process. Leaf area and leaf dry mass reached the steadystate value 46 and 62 days after bud break, respectively. Net photosynthesis increased from bud break to full leaf expansion, and total chlorophyll content had the same trend, confirmed by the correlation between the two variables. Leaf dark respiration peaked during the first 11 days of leaf expansion, then decreased and reached a steadystate value 34 days after bud break. R. alaternus completed cell division and cell enlargement of the epidermal tissue 28 days after bud break, and the ones of the mesophyll tissue at full leaf expansion. The results underline that morphological, anatomical and physiological leaf traits in R. alaternus are indicative of a less sclerophyllous species (i.e. higher specific leaf area) compared with other Mediterranean evergreen species. Moreover, the higher fraction of mesophyll volume occupied by the intercellular air spaces, and the ability to end the leaf expansion process before air temperature might be a limiting factor, makes R. alaternus closer to the mesophyte species

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“…Besides light, other abiotic factors such as seasonal variations in temperature and water may greatly influence photosynthetic performance and plant anatomy (Gratani et al, 2008;Herrera et al, 2009). Usually in the dry season there is a reduction in photosynthetic assimilation and transpiration as a consequence of reduced stomatal conductance .…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic performance and anatomical adaptations in Byrsonima sericea DC. under contrasting light conditions in a remnant of the Atlantic forest

Silva

Oliveira

Cunha

et al. 2010

Braz. J. Plant Physiol.

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The photosynthetic dynamics of the tropical pioneer species, Byrsonima sericea DC., were studied during the regeneration process of a native forest by evaluating ecophysiological (gas exchange, chlorophyll a fluorescence and photosynthetic pigment contents) and anatomical parameters of plants in sunny and shady environments. Ecophysiological evaluations were carried out monthly for one year, encompassing both a dry and a rainy season. Byrsonima sericea DC. presents anatomical plasticity that enables it to establish in environments with contrasting light regimes. In sunny conditions, it produced a thicker leaf (about 420 mm) and flat adaxial epidermis, whilst in the shade, leaves had a thinner convex adaxial epidermis (about 395 mm). No differences were found in the compositions of the pigments in the different environments, however, during the dry season, the plants presented a significantly higher concentration of photosynthetic pigments. In the sun, plants showed decreases in Fv/F0 ratio (in the rainy season) and NPQ (in the dry season), but no difference was observed between plants that were in the sun or in the shade. A significantly higher net photosynthetic rate was found only in the rainy season in the plants in the sun, compared to shaded plants (9.9±0.8 and 7.4±0.3 μmol m -2 s -1 , respectively). Significant increase in transpiration was observed in plants in the shade during the dry season, but no alterations were observed in the water use efficiency. Ecophysiological data suggest that mainly plants overexposed to the sun underwent water limitations during the dry season and that, in the rainy season, these plants increased their net photosynthetic rate, possibly due to the greater drainage force resulting from increased growth during this period. Data suggest that anatomic alterations, namely the convex adaxial epidermis, could aid in the supply of light to shaded plants during both seasons, precluding changes in the pigments, such as the increase in chlorophyll b usually observed in shaded plants, but not detected in the present study. Another consequence of the greater quantity of light captured by these shade plants is that during the dry season their net photosynthetic rate was not different from that of plants in a sunny environment. However, when water was not a limiting factor, a better photosynthetic performance was observed in this pioneer specie in open spaces.Key words: Atlantic forest species; photosynthetic adaptation; leaf anatomy; sun overexposure; shaded plants. RESUMOA dinâmica fotossintética da espécie pioneira tropical Byrsonima sericea DC. foi estudada durante o processo de regeneração de uma mata nativa por avaliações ecofisiológicas (trocas gasosas, fluorescência da clorofila a e conteúdo de pigmentos fotossintéticos) e parâmetros anatômicos das plantas em ambientes ensolarados e sombreados. As avaliações ecofisiológicas foram feitas mensalmente por um ano e os dados foram agrupados em estação seca e chuvosa. Byrsonima sericea DC. apresentou plasticidade anatômica que a ...

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Relationship between net photosynthesis and leaf respiration in Mediterranean evergreen species

Cited by 36 publications

References 38 publications

Climate controls act at different scales on the seasonal pattern of Quercus ilex L. stem radial increments in NE Spain

Climate controls act at different scales on the seasonal pattern of Quercus ilex L. stem radial increments in NE Spain

Leaf expansion in Rhamnus alaternus L. by leaf morphological, anatomical and physiological analysis

Photosynthetic performance and anatomical adaptations in Byrsonima sericea DC. under contrasting light conditions in a remnant of the Atlantic forest

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