Manganese Absorption by Excised Barley Roots

Manganese absorption by excised barley roots.

Short-term absorption studies with 5-day-old excised barley roots revealed that the basic aspects of Mn absorption were similar to those of other metabolically absorbed cations. Following an initial non-metabolic equilibration with the root, Mn was absorbed for several hours at a slower steady-state rate comparable to that of other inorganic cations. Complete or nearly complete inhibition of th...

Respiration and Salt Absorption by Excised Barley Roots.

Some Observations on Absorption of Cesium by Excised Barley Roots.

Because Cs 137 is one of the major long-lived products of nuclear fission, there is a growing interest in the uptake of cesium by plants and its subsequent introduction into food chains. At the same time. the fact that Cs is readily absorbed by plants from culture solutions makes it useful in studies of the general aspects of ion uptake. Its use has the additional advantage that the initial ces...

Selenium absorption by excised Astragalus roots.

Absorption of selenate and selenite by excised roots of Astragalus Crotalariae, a selenium accumulator, and of A. lentiginosus, a non-accumulator, was favored by CaCl(2) and a pH of 4.0. The uptake of selenate and possibly selenite, is metabolically linked. Roots of a number of Astragalus species were examined, and in all cases selenate entered the roots much faster than selenite. In these shor...

Phosphorylation by Barley Root Mitochondria & Phosphate Absorption by Barley Roots.

The absorption by roots of ions in general, and phosphate absorption in particular, can occur against concentration gradients so great as to require free energy changes of the order of 8,000 calories per nmole. This implies coupling in the absorption process with reactions Jeroceecling wdith considerable free energy decrease. Few reacticius in plants other than those for production or destructi...