Estresse luminoso em plântulas de jequitibá-rosa (Cariniana legalis, Lecythidaceae): monitoramento da capacidade de aclimatação fotossintética sob duas intensidades de luz

Vieira, Tatiane de Oliveira; Lage-Pinto, Frederico; Ribeiro, Douglas Rodrigues; Alencar, Thaís dos Santos; Vitória, Ângela Pierre

doi:10.5935/1809-2667.20110029

Cited by 5 publications

(3 citation statements)

References 41 publications

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“…Studies on leaf pigment contents suggest that the photosynthetic apparatus adapts to changes in irradiance (Portes et al 2010, Silva et al 2010, Vieira et al 2011, Lage-Pinto et al 2012) throughout leaf development (Rosevear et al 2001). Chls also undergo photooxidation under high irradiance (Hendry andPrice 1993, Araújo andDeminicis 2009).…”

Section: Discussionmentioning

confidence: 99%

Photoacclimation capacity in seedling and sapling of Siparuna guianensis (Siparunaeae): Response to irradiance gradient in tropical forest

Vieira¹,

Degli-Esposti²,

Souza³

et al. 2015

Photosynt.

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Light is a limiting factor in plant establishment and growth in the understory of forests. In this paper, we assessed acclimation capacity of Siparuna guianensis, an early secondary successional species. We used seedlings and saplings in three regeneration areas with different irradiance regimes to determine the traits that confer photoplasticity. We examined whether these traits differ at different developmental stages. Anatomical characteristics, photochemical efficiency, photosynthetic capacity, and growth were analyzed. Multivariate component analysis revealed the formation of six clusters: three for seedlings (one for each regeneration area) and three for saplings (following the same pattern of seedlings, considering the area). Increased irradiance favored photosynthetic performance, independently of the developmental stage. The same trend was observed for most data on chlorophyll (Chl) a fluorescence and the ratios of net photosynthetic rate/intercellular CO2 concentration (P N /C i ) and P N /PPFD. No parameter indicated photoinhibition stress. The CO 2 -and light-response curve data indicated that seedlings were already acclimated to tolerate variation in irradiance. Anatomical adaptations, such as thickness of leaf blade and of adaxial cuticle, were observed in individuals growing in areas with higher irradiation. Thinning of spongy parenchyma and higher investment into a plant height were observed in seedlings, possibly due to the vertical stratification of CO 2 and light in the understory; because light is a more limiting resource than CO 2 in the lower stratum of the forest. Photoplasticity in S. guianensis is associated with a set of morphological, anatomical, photochemical, and biochemical traits, whereas biochemical performance is best acclimated to variation in irradiance. These traits differed in seedlings and saplings but they were modulated mainly by irradiance in both developmental stages.

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Section: Discussionmentioning

confidence: 99%

Photoacclimation capacity in seedling and sapling of Siparuna guianensis (Siparunaeae): Response to irradiance gradient in tropical forest

Vieira¹,

Degli-Esposti²,

Souza³

et al. 2015

Photosynt.

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“…Gas exchange was measured at 8:00 a.m. on the same leaves used for extraction of the photosynthetic pigments with a portable infrared gas analyser (IRGA) (LI-6200, LI-COR Inc., Lincoln, USA) in a closed system at 380 ppm CO 2 concentration and 28°C. An artificial light source was used with approximately 1500 lmol m -2 s -1 light intensity (Vieira et al 2011 …”

Section: Pigments and Photosynthesismentioning

confidence: 99%

How does Cariniana estrellensis respond to different irradiance levels?

et al. 2018

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Based on reports that variables related to photosynthesis (net assimilatory ratio and chloroplast pigments) are more plastic than the morphological and biochemical variables in a climax tropical species, Cariniana estrellensis, under contrasting irradiance, we hypothesised that plasticity of gas exchange variables is higher in relation to growth, biochemical and anatomical variables. Plants that were 14 months old were subjected to 200 up to 2000 lmol m -2 s -1 of photo synthetically active radiation (PAR) for 140 days. Growth increased up to 1400 lmol m -2 s -1 PAR and then decreased at 2000 lmol m -2 s -1 PAR (full sunlight). This was related to the rate of photosynthesis (A) which showed the same tendency as photosystem II performance index (PI ABS ). The greater thickness of the secondary xylem at 1400 lmol m -2 s -1 PAR indicated a higher water conductance capacity. The decrease in specific leaf area, elongation of mesophyll cells, and increase in stomatal density observed at higher irradiances were associated with higher leaf fructose and sucrose concentrations. We concluded that the better growth in partial shade was due to higher photosynthetic capacity. On the other hand, photosynthesis was inhibited equally in full sun and deep shade. The high adjustment capacity of C. estrellensis to wide amplitudes of irradiance was provided by greater plasticity of gas exchange variables in relation to growth, anatomical, and biochemical variables.

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“…The limitation in the photosynthetic process is influenced by changes in anatomical structures, mainly the thickness of the palisade parenchyma, and stomatal density, in addition to changes in the vascular system, particularly in the xylem and in the density and thickness of the vessels, which control the flow of CO2 and the water entering the plant (Vieira et al 2011). A species with the ability to modify its anatomical structures and its photosynthetic apparatus under different environmental conditions can escape, doing so to avoid serious damage due to stress (Maggio et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Responses of wild Piper species to drought and rehydration cycles considering stomatal closure as a marker of the alarm phase

CERRI NETO,

SILVA,

FERREIRA

et al. 2023

Photosynt.

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Abbreviations: abE -abaxial epidermis; ABS/RC -energy absorption flux per reaction center; adE -adaxial epidermis; APDM -dry mass of the aerial part; Chl -chlorophyll; Ci -internal CO2 concentration; CSVBL -cortex stem vascular bundle length; DCSVdiameter of cortex stem vessels; DI0/RC -energy flux dissipated per reaction center; E -transpiration; EDS -equatorial diameter of stomata; ET0/RC -energy transport flow per reaction center; gs -stomatal conductance; ICE -instantaneous carboxylation efficiency; LA -leaf area; LAR -leaf area ratio; LDM -leaf dry mass; LMF -leaf mass fraction; LSMVB -length of stem medulla vascular bundle; LSMX -length of stem medulla xylem; LVBL -leaf vascular bundle length; NL -number of leaves; NRV -number of root vessels; NVMS -number of vessels medulla stem; NXV -number of xylem vessels; PDS -polar diameter of stomata; PI(abs) -performance index for conservation of energy from captured excitons to reduction of intersystem electron acceptors; PN -photosynthetic rate; PPTpalisade parenchyma thickness; RC/CS0 -number of active PSII reaction centers per cross sections; RDM -root dry mass; Rep -root epidermis; RI -robustness index; RMF -root mass fraction; R/SR -root/shoot ratio; RS -reducing sugar; RTD -root tissue density; RV -root volume; RVD -root vessel diameter; RXL -root xylem length; SD -stem diameter; Sd -stomatal density; SL -stem length; SMF -stem mass fraction; SPT -spongy parenchyma thickness; SRL -specific root length; TDM -total dry mass; TR0/RC -energy flow captured by reaction center; TSS -total soluble sugar; WUE -water-use efficiency; XCSL -xylem cortex stem length; φE0quantum efficiency of electron transfer from QAto the electron transport chain beyond QA -; φP0 -maximum photochemical quantum yield; Ψ -leaf water potential.

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Estresse luminoso em plântulas de jequitibá-rosa (Cariniana legalis, Lecythidaceae): monitoramento da capacidade de aclimatação fotossintética sob duas intensidades de luz

Cited by 5 publications

References 41 publications

Photoacclimation capacity in seedling and sapling of Siparuna guianensis (Siparunaeae): Response to irradiance gradient in tropical forest

Photoacclimation capacity in seedling and sapling of Siparuna guianensis (Siparunaeae): Response to irradiance gradient in tropical forest

How does Cariniana estrellensis respond to different irradiance levels?

Responses of wild Piper species to drought and rehydration cycles considering stomatal closure as a marker of the alarm phase

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