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- W2056527668 abstract "Abstract Mechanisms whereby NH 4 influences the accumulation of cations in tobacco were investigated using short‐term solution studies with Rb 86 . Measurements on the influence of seedling size and absence of tops on the accumulation of Rb in roots indicated that the size of the plant was positively correlated with Rb accumulation only to the extent of 0.7. During a 6‐hour period roots had the major influence on Rb accumulation, the absence of tops making little or no difference. During this absorption period it was found that NH 4 had the same influence as K on the absorption of Rb, while after 24 to 48 hours NH 4 , relative to K, had an additional depressive influence on Rb accumulation, especially in the tops of seedlings. The possible involvement of NH 4 influences on transpiration rate and associated passive ion transport was investigated. No NH 4 influence on transpiration was found during periods extending to 70 hours. Salt treatments subsequent to Rb 86 treatments indicated that the distribution of Rb was dependent more on conditions during its absorption than on those imposed later. Results from these and other studies are used to develop a mechanism for Rb absorption and distribution by tobacco seedlings which accounts for the observed influences of NH 4 on Rb accumulation through an effect on absorption competition and metabolic ion transport." @default.
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- W2056527668 date "1963-09-01" @default.
- W2056527668 modified "2023-09-27" @default.
- W2056527668 title "Ammonium Influences on Rubidium Absorption and Distribution by Tobacco Seedlings" @default.
- W2056527668 doi "https://doi.org/10.2136/sssaj1963.03615995002700050024x" @default.
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