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| Gonçalves,José Francisco de Carvalho; Santos Júnior,Ulysses Moreira dos; Silva,José Ferreira da; Arruda,Murilo Rodrigues de; Bonates,Luiz Carlos de Matos; Fernandes,Andreia Varmes. |
| The 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 transpiration found for BRS-CG372RC were 27% greater and 80% lesser than values found for BRS-CG611RL, respectively. The values of stomatal conductance found for the clones BRS-CG372RC and BRS-CG611RL were in the order of 224 and 614 mmol mm-2 s-1, respectively. The values of photorespiration, rate of carboxylation and rate electron transport were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Paullinia cupana; Photosynthesis; Photochemical efficiency of photosystem II; Electron transport rate; Water use efficiency; Stomatal anatomy. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000300004 |
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| Gonçalves,José Francisco de Carvalho; Barreto,Denize Caranhas de Sousa; Santos Junior,Ulysses Moreira dos; Fernandes,Andreia Varmes; Sampaio,Paulo de Tarso Barbosa; Buckeridge,Marcos Silveira. |
| Aniba rosaeodora is an Amazonian tree species that belongs to the family Lauraceae. Due to intense exploitation for extraction of essential oils (mainly linalol), A. rosaeodora is now considered an endangered species. On the other hand, there is little information about its ecophysiology which would be useful to support future forest planting programs. Hence, the effect of different light intensities on the growth and photosynthetic characteristics of young plants of A. rosaeodora was studied. Nine-month-old plants were subjected to four light treatments (T1= 10 a 250 µmol.m-2.s-1 / control; T2=500 to 800, T3=700 to 1000 and T4=1300 to 1800 µmol.m-2.s-1 / full sunlight). Allometric variables, gas exchange, contents of pigments and chlorophyll a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chlorophyll a fluorescence; Chloroplast pigment contents; Gas exchanges; Photochemical efficiency of photosystem II; Relative growth rate; Tropical species. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000300007 |
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