SOME ASPECTS OF POTASSIUM LOSS FROM 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...

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.

A Study of the Role of the Hydrogen Ion in the Mechanism of Potassium Absorption by Excised Barley Roots.

precedingw or following irrigations. No reduction in the rate of photosynthesis was cletected as soil moisture was extracted, until the approximate time the first visible signs of wilting appeared. As the severity of wilting increased, the photosynthetic rate declined rapidly. When the plants were (listinctly wilted, photosynthetic activity had been reduced to approximately 75 % of its maximum ...

Reduction of Hydraulic Conductivity during Inhibition of Exudation from Excised Maize and Barley Roots.

The uncoupler, carbonyl cyanide m-chlorophenyl hydrazone (CCCP) is shown to reduce the hydraulic conductivity of barley, maize, mung bean, and onion roots. In barley and maize, the reduction in exudation from excised roots is partly due to the reduction in the permeability of the root to water (I(p)), but it can be inferred that the rate of salt release to the xylem, is also inhibited. The acti...