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How does Cariniana estrellensis respond to different irradiance levels?

Journal of Forestry Research 2019年第1期30卷 31-44页

作者： Flávia Carolina Santos Portela bernardo pretti becacici macieira Leonardo Valandro Zanetti Vinícius Novo Gama Diolina Moura Silva Camilla Rozindo Dias Milanez Geraldo Rogério Faustini Cuzzuol Department of Biological Sciences Federal University of Espírito Santo

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 *** that were 14 months old were subjected to200 up to 2000 lmol m^(-2)s^(-1) of photo synthetically active radiation(PAR)for 140 *** increased up to1400 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 *** 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 *** concluded that the better growth in partial shade was due to higher photosynthetic *** the other hand,photosynthesis was inhibited equally in full sun and deep *** high adjustment capacity of *** to wide amplitudes of irradiance was provided by greater plasticity of gas exchange variables in relation to growth,anatomical,and biochemical variables.

关键词： Anatomy Ecophysiology Gas exchange Phenotypic plasticity Soluble carbohydrates

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