%0 Journal Article
%T Ecophysiological studies of two andean forest contrasting species Abatia parviflora and Myrcianthes leucoxyla under Bogot¨¢ conditions, Colombia
%A Colmenares-Trejos
%A Sara L.
%A Melgarejo
%A Luz Marina
%A Romero A.
%A Hern¨¢n Mauricio
%J Brazilian Journal of Plant Physiology
%D 2011
%I Scientific Electronic Library Online
%R 10.1590/S1677-04202011000400008
%X the physiological response of high andean forest contrasting plants, myrcianthes leucoxyla, a shadow-facultative heliophyte, and abatia parviflora, a heliophyte, was studied during the transition from dry season to wet season in bogot¨¢. light response curves (a-par), water potential (¦×w), transpiration rate (e), stomatal conductance (gs), leaf soluble protein content and peroxidase activity were measured in this study in a 48h cycle. the values for e, gs, ¦×w and ¦×w predawn for m. leucoxyla were 0.07 to 4.89 ¦Ìg/cm s, 0.02 to 0.5 cm s-1, -0.025 to -1.05 mpa, and-0.1 mpa, respectively. for a. parviflora e, gs, ¦×w and ¦×w predawn were 0.47 to 12.27 ¦Ìg/cm s, 0.17 to 1.42 cm s-1, -0.05 to -0.3 mpa and -0.075 mpa, respectively. a. parviflora presented a tendency of stomatal closure at midday and peroxidase activity increased with the increasing solar radiation, this did not occur in m. leucoxyla. the light compensation point (ic) in a. parviflora was about 18.10 ¦Ìmol photon m-2s-1, typical for a heliophyte plant; while for m. leucoxyla it was 8.87 ¦Ìmol photon m-2s-1, slightly above the maximal reported values for shadow plants and under the minimal reported values for light plants. the lowest photosynthetic rate (a) of m. leucoxyla (2.8 ¦Ìmol co2 m-2s-1) in comparison with a. parviflora (7.4 ¦Ìmol co2 m-2s-1) is compensated with a better photonic use efficiency (¡À 0.7792 mol c mol-1).
%K a-par curves
%K gas exchange
%K heliophyte
%K shadow plant
%K water potential.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1677-04202011000400008&lng=en&nrm=iso&tlng=en