caa a22 4500 605480494 CHVBK 20210128100415.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s11099-015-0073-x doi (NATIONALLICENCE)springer-10.1007/s11099-015-0073-x Photoacclimation capacity in seedling and sapling of Siparuna guianensis (Siparunaeae): Response to irradiance gradient in tropical forest [Elektronische Daten] [T. Vieira, M. Degli-Esposti, G. Souza, G. Rabelo, M. Da Cunha, A. Vitória] 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/Ci) and P N/PPFD. No parameter indicated photoinhibition stress. The CO2− 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 CO2 and light in the understory; because light is a more limiting resource than CO2 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. The Institute of Experimental Botany, 2015 chlorophyll nationallicence chlorophyll fluorescence nationallicence CO2 uptake nationallicence growth nationallicence leaf anatomy nationallicence structural traits nationallicence ab : abaxial surface nationallicence ad : adaxial surface nationallicence Car : carotenoids nationallicence CCU : closed canopy understory nationallicence Chl : chlorophyll nationallicence C i : intercellular CO2 concentration nationallicence ct : cuticle nationallicence DGL : diameter at ground level nationallicence DMSO : dimethylsulfoxide nationallicence ETR : electron transport rate nationallicence FV : final value nationallicence Fv/Fm : maximal quantum yield of PSII nationallicence g s : stomatal conductance nationallicence GN : percentage gain nationallicence H : height nationallicence ICU : intermediate canopy understory nationallicence IV : initial values nationallicence Jmax : maximal electron transport rate nationallicence L s : relative stomatal limitation to photosynthesis nationallicence NL : number of leaves nationallicence NPQ : nonphotochemical quenching nationallicence OCU : open canopy understory nationallicence PCA : principal component analysis nationallicence PC1 : first principal component nationallicence PC2 : second principal component nationallicence P N : net photosynthetic rate nationallicence P Neff : effective net photosynthetic rate nationallicence P NmaxC : potential net photosynthetic capacity nationallicence P Nmax : maximal net photosynthetic rate nationallicence P NmaxL : maximal net photosynthetic capacity nationallicence pp : palisade parenchyma nationallicence LSP : light-saturation point nationallicence qP : photochemical quenching nationallicence RH : relative humidity nationallicence SAC : shade adjustment coefficient nationallicence sp : spongy parenchyma nationallicence T : temperature nationallicence TLA : total leaf area nationallicence TPU : use of triose-phosphate nationallicence Vcmax : maximal carboxylation speed of Rubisco nationallicence VPD : vapor pressure deficit nationallicence ΔG : delta growth nationallicence ΔF/Fm′ : effective quantum yield nationallicence Vieira T. Laboratório de Ciências Ambientais, Centro de Biociência e Biotecnologia, Universidade Estadual do Norte Fluminense, 28013 — 602, Campos dos Goytacazes, RJ, Brazil aut Degli-Esposti M. Laboratório de Ciências Ambientais, Centro de Biociência e Biotecnologia, Universidade Estadual do Norte Fluminense, 28013 — 602, Campos dos Goytacazes, RJ, Brazil aut Souza G. Laboratório de Inteligência em Plantas e Ecofisiologia "Ulrich Lüttge”, Universidade do Oeste Paulista Unoeste, 60455 — 970, Presidente Prudente, SP, Brazil aut Rabelo G. Laboratório de Biologia Celular e Tecidual, Centro de Biociência e Biotecnologia, Universidade Estadual do Norte Fluminense, 28013 — 602, Campos dos Goytacazes, RJ, Brazil aut Da Cunha M. Laboratório de Biologia Celular e Tecidual, Centro de Biociência e Biotecnologia, Universidade Estadual do Norte Fluminense, 28013 — 602, Campos dos Goytacazes, RJ, Brazil aut Vitória A. Laboratório de Ciências Ambientais, Centro de Biociência e Biotecnologia, Universidade Estadual do Norte Fluminense, 28013 — 602, Campos dos Goytacazes, RJ, Brazil aut Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/1(2015-03-01), 11-22 0300-3604 53:1<11 2015 53 11099 https://doi.org/10.1007/s11099-015-0073-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11099-015-0073-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vieira T. Laboratório de Ciências Ambientais, Centro de Biociência e Biotecnologia, Universidade Estadual do Norte Fluminense, 28013 — 602, Campos dos Goytacazes, RJ, Brazil aut NATIONALLICENCE 700 1- Degli-Esposti M. Laboratório de Ciências Ambientais, Centro de Biociência e Biotecnologia, Universidade Estadual do Norte Fluminense, 28013 — 602, Campos dos Goytacazes, RJ, Brazil aut NATIONALLICENCE 700 1- Souza G. Laboratório de Inteligência em Plantas e Ecofisiologia "Ulrich Lüttge”, Universidade do Oeste Paulista Unoeste, 60455 — 970, Presidente Prudente, SP, Brazil aut NATIONALLICENCE 700 1- Rabelo G. Laboratório de Biologia Celular e Tecidual, Centro de Biociência e Biotecnologia, Universidade Estadual do Norte Fluminense, 28013 — 602, Campos dos Goytacazes, RJ, Brazil aut NATIONALLICENCE 700 1- Da Cunha M. Laboratório de Biologia Celular e Tecidual, Centro de Biociência e Biotecnologia, Universidade Estadual do Norte Fluminense, 28013 — 602, Campos dos Goytacazes, RJ, Brazil aut NATIONALLICENCE 700 1- Vitória A. Laboratório de Ciências Ambientais, Centro de Biociência e Biotecnologia, Universidade Estadual do Norte Fluminense, 28013 — 602, Campos dos Goytacazes, RJ, Brazil aut NATIONALLICENCE 773 0- Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/1(2015-03-01), 11-22 0300-3604 53:1<11 2015 53 11099