4 documents found, page 1 of 1
Chloroplastid pigment contents and chlorophyll a fluorescence in Amazonian trop...
Morais, Ronaldo Ribeiro de; Gonçalves, José Francisco Carvalho de; dos Santos, Ulysses Moreira; Dünisch, Oliver; Santos, André Luis dosPlants react to changes in light and hydrological conditions in terms of quantity and composition of chloroplastidic pigments, which affects the photosynthetic properties and consequently the accumulation of plant biomass. Thus, the chloroplastidic pigment concentration and chlorophyll a fluorescence of three Amazonian species (Bertholletia excelsa, Carapa guianensis e Dipteryx odorata) were investigated in sun...
Physiological and anatomical characteristics of leaves of two clones of guarana
Gonçalves, José Francisco Carvalho de; dos Santos, Ulysses Moreira; Silva, José Ferreira da; Arruda, Murilo Rodrigues de; Bonates, Luiz Carlos de MatosThe objective of this work was to analyze gas exchange, photosynthetic characteristics, photochemical efficiency of photosystem II and anatomical characteristics of young plant leaves of two guarana (Paullinia cupana) clones (BRS-CG372RC and BRS-CG611RL) growing under open field. The variables of gas exchange and fluorescence of chlorophyll a were evaluated in mature leaves. The values of photosynthesis and tra...
Biomass accumulation, photochemical efficiency of photosystem II, nutrient cont...
Barreto, Denize Caranhas de Sousa; Gonçalves, José Francisco Carvalho de; dos Santos, Ulysses Moreira; Fernandes, Andréia Varmes; Bariani, AdrianaThe rosewood (Aniba rosaeodora Ducke) is a native tree species of Amazon rainforest growing naturally in acidic forest soils with reduced redox potential. However, this species can also been found growing in forest gaps containing oxide soils. Variations in the forms of mineral nitrogen (NO 3- or NH4+) may be predicted in these different edaphic conditions. Considering that possibility, an experiment was carrie...
Biomass, gas exchange and nutritional aspects of young plants of Balsa Wood (Oc...
Cunha, Hellen Fernanda Viana; Gonçalves, José Francisco Carvalho de; dos Santos, Ulysses Moreira; Ferreira, Marciel JoséThe irradiance and nutrient supply affect the assimilation of carbon and influence the gain and biomass partition. The aim of this research was to investigate the growth and photosynthesis in young plants of Ochroma pyramidale subjected to contrasting light environments and phosphorus fertilization. Young plants of O. pyramidale were exposed to two irradiance levels (Low: 10 to 15 and High: 1200 to 1400 μmol m-...