Portulacaria
Mostrando 1-4 de 4 artigos, teses e dissertações.
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1. Acúmulo de massa seca e conteúdo de água em plântulas de Portulacaria afra Jacq irrigadas com água salina.
2009
CONGRESSO BRASILEIRO DE FISIOLOGIA VEGETAL. Publicado em: 2011
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2. Induction of Acid Metabolism in Portulacaria afra1
Portulacaria afra, a succulent plant, shifts from a predominantly C3 mode of gas exchange to a typical Crassulacean acid metabolism type CO2 uptake in response to water or NaCl stress. Control plants in the absence of water stress assimilated CO2 during the light (about 7-8 mg CO2 dm−2 hr−1), transpiration (about 1.5 g dm−2 hr−1) was predominantly du
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3. Physiological Changes in Portulacaria afra (L.) Jacq. during a Summer Drought and Rewatering 1
The changes of titratable acidity, enzyme activity, water status, and pigment composition were studied in Portulacaria afra (L.) Jacq. during a normal summer drought and rewatering. Two groups of plants were grown outside under a clear plastic canopy with water stress initiated at 2-week intervals in May 1986. Drought resulted in a linear decrease of fresh w
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4. Effects of Various Levels of CO2 on the Induction of Crassulacean Acid Metabolism in Portulacaria afra (L.) Jacq. 1
In response to water stress, Portulacaria afra (L.) Jacq. (Portulacaceae) shifts its photosynthetic carbon metabolism from the Calvin-Benson cycle for CO2 fixation (C3) photosynthesis or Crassulacean acid metabolism (CAM)-cycling, during which organic acids fluctuate with a C3-type of gas exchange, to CAM. During the CAM induction, various attributes of CAM