of the cell wall: The growth equation for the rate of water uptake is augmented with a transpiration term. The obtained augmented growth equations are used to develop methodology which employs the pressure probe to measure transpiration rates from single plant cells. Experiments are conducted on the sporangiophores of Phycomyces blakesleeanus to demonstrate this

There has been limited application of sapflow technology to small-stemmed species and across co-existing functional types, restricting its use in diverse floras such as the Mediterranean-type shrubland in South Africa. Our main objective was to test whether sapflow may provide an alternative to traditional gas-exchange measurements, which would permit comparative evaluation of transpiration at ...

The effect of streamwise-varying steady transpiration on turbulent pipe flow is examined using direct numerical simulation at fixed friction Reynolds number Reτ = 314. The streamwise momentum equation reveals three physical mechanisms caused by transpiration acting in the flow: modification of Reynolds shear stress, steady streaming and generation of non-zero mean streamwise gradients. The infl...

The present study had as its main objective the evaluation of the heat balance method in young orange and mango plants under protected environment. The work was carried out at Embrapa Cassava and Tropical Fruits, Cruz das Almas, BA. Later on, estimates of sap flow were conducted for two mango plants cultivated in pots of 15 and 50 L installed on weighting platforms of 45 and 140 kg; sap flow wa...

under controlled environmental conditions. C.S.I.R.O. Div. Land Res. Tech. Paper 24. 2. DECKER, J. P., W. G. GAYLOR, AND F. D. COLE. 1962. Measuring transpiration of undisturbed Tamarisk Shrubs. Plant Physiol. 27: 393-97. 3. DEUTSCHEN, W. 1955. Aspirations-PsychrometerTafeln (Friedr, Viewg, and Sohn, Braunschweig, Germany). 4. HEATH, 0. S. AND H. MEIDNER. 1961. The influence of water strain on ...

High concentrations of inorganic carbon in the xylem, produced from root, stem, and branch respiration, travel via the transpiration stream and eventually exit the plant through distant tissues as CO2. Unlike previous studies that focused on the efflux of CO2 from roots and woody tissues, we focus on efflux from leaves and the potential effect on leaf respiration measurements. We labeled transp...

Transpiration is controlled by evaporative demand and stomatal conductance (gs ), and there can be substantial genetic variation in gs . A key parameter in empirical models of transpiration is minimum stomatal conductance (g0 ), a trait that can be measured and has a large effect on gs and transpiration. In Arabidopsis thaliana, g0 exhibits both environmental and genetic variation, and quantita...

The effect of restricted xvater supply or drought periods on transpiration after rewatering the plants has been investigated repeatedly (3, 4, 5, 9, 11, 16). It has been found that, after a periodl of recovery, changes in the transpiration rate in plants grown under restricted water supply relative to those in plants not subjected to water stress may occur. The recorded rates, however, vary wid...

Experimental evidence is presented to show that the O enrichment in the leaf biomass and the mean (timeaveraged) transpiration rate are positively correlated in groundnut and rice genotypes. The relationship between oxygen isotope enrichment and stomatal conductance (gs) was determined by altering gs through ABA and subsequently using contrasting genotypes of cowpea and groundnut. The Peclet mo...

The role of photosynthesis and transpiration in the desiccation-induced inhibition of acetylene reduction (nitrogen fixation) was investigated in soybean (Glycine max [L.] Merr. var. Beeson) using an apparatus that permitted simultaneous measurements of acetylene reduction, net photosynthesis, and transpiration. The inhibition of acetylene reduction caused by low water potentials and their afte...