The penetration, retention and transport of foliar applied chloride salts of Na‐22, K‐43, Rb‐86, and Cs‐134 were studied under controlled environmental conditions. Penetration although occurring at different rates was found to be non‐selective and appears to be a passive free diffusion process. Retention in the treated area is similar for Na, K and Rb and greater for Cs. Transport of these elements away from that area and in the plant was greatest and fastest for Na and Rb and slower for Cs and K. Distribution in the plants following leaf treatment was similar for K, Rb and Cs but no significant upward transport was noted for Na. Losses from roots were greatest for Na. No significant K could be detected in the culture medium 4 days after treatment of the leaves.
The initial and subsequent distribution of 22Na, 43K, 86Rb, 134Cs, 32P, 35S, 45Ca, 65Zn and 85Sr in bean plants, following leaf and root uptake was studied under controlled environmental conditions. Autoradiographic and counting methods reveal vascular connections between leaves and roots and two patterns of distribution in the leaves following root uptake are reported. Distribution following treatment of specific parts of the leaves or roots points to a morphological unity in the bean plant. A possible circulation pattern for some ions is discussed.
The foliar uptake and subsequent transport in bean plants of 22Na, 32pand 134CS was studied under controlled environmental conditions but at varying root temperatures. The amounts taken up by the plants, held in the treated areas, distributed in various plant fractions or excreted through the roots were determined for periods of up to 6 days. Uptake of 22Na was found to be slower than that of mcs and much faster than that of 32P. Root temperature strongly influenced the rate of entrance of the isotopes with an optimum range between 20 and 25°C. The penetration was found to be more affected by the root temperature during the pretreatment period than by that during the experimental period itself. The translocation and distribution during the first 6 hours of the experimental periods were also influenced by the pretreatment temperature of the roots. Na and Cs leakage in the solution was found to occur at all temperatures, provided transport had allowed their presence in the root tissues.
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