Diel variation in specific hydraulic conductivity ( k s ) was recorded in petioles of two savanna tree species, Schefflera macrocarpa and Caryocar brasiliense , from central Brazil. These two species have compound leaves with long petioles (10–30 cm). In both species, petiole k s decreased sharply with increasing transpiration rates and declining leaf water potentials ( y L ) during the morning...

One of the most controversial problems in plant physiology is that of translocation of organic materials inside the plant. This is mainly due to a lack of information. In spite of the investigations of Crafts, Curtis, Mason, Munch, Phyllis, Schumacher and many others, we need much more basic information before we will have a proper insight in this problem and before we can accept a satisfactory...

somatic embryogenesis is a new approache to plant mass in vitro propagation. this method influences by elements and their components in medium. in order to investigate the effects of different media and it,s role on somatic embryogenesis of carrot, a cbd experiment with four replications (including 12 treatments) was conducted. to do this, carrot petioles (with 1 cm dimension) in induction phas...