Relationships between Root System Water Transport Properties and Plant Size in Phaseolus1
AUTOR(ES)
Fiscus, Edwin L.
RESUMO
Root system hydraulic conductivity (LP) was measured on Phaseolus plants of different ages and sizes. Data analysis showed that LP changed in a complex manner depending on plant size. As the plants increased in size, LP increased initially then gradually decreased followed by a final modest increase. Values for LP ranged between 0.8 × 10−6 and 6.1 × 10−6 centimeter per second per bar. Relationships between the root flow per unit leaf area at a pressure differential of 3 bars (QPL3), as well as the total root system conductance (LR), and plant size were also examined. Values for QPL3 varied with plant size, somewhat like LP. LR values continuously increased with plant size at rates which depended on the growth rate of the root surface area as well as LP. Comparison of our data with the root conductivity constant (kr) of Taylor and Klepper (1975 Soil Sci, 120: 57-67) showed good agreement. The observations on Phaseolus were also confirmed for Glycine. Values for LP and kr of both species were within the same range.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=543360Documentos Relacionados
- Pectin Esterase in Relation to Leaf Abscission in Coleus and Phaseolus1
- NMR imaging shows water distribution and transport in plant root systems in situ
- Abscisic Acid Transport Coefficients of Phaseolus Root Systems 1
- Water Transport Properties of Roots and Root Cortical Cells in Proton- and Al-Stressed Maize Varieties.
- Mercuric Chloride Effects on Root Water Transport in Aspen Seedlings1