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Extra resources for Plant Physiology. Analysis of Growth: A Treatise: The Responses of Cells and Tissues in Culture
Definitive proof that the sucrose is phosphorylated as part of its uptake is lacking. The work of Porter and May (585) on sucrose uptake by leaf disks points to uptake of the intact sucrose molecule and its release into the cytoplasm. The external concentrations of sucrose required to support the rapid growth of cultured roots are greatly in excess of the internal levels of sucrose established in the root cells. , that it can proceed against the concentration gradient. 2% or less of sucrose, uptake of this sugar against the concentration gradient can be readily demonstrated.
Data from Street and Melhuish ( 7 4 6 ) . 6. GROWTH IN ORGANIZED AND UNORGANIZED SYSTEMS 33 not been exploited for studies of the mechanisms involved in salt uptake. However, recent studies with cultured excised wheat roots have exposed a stimulation by light of nitrate uptake ( 2 0 0 ) . When excised wheat roots, derived directly from seedling root tips, are maintained in culture for more than 5 days, illumination of the cultures enhances growth of the roots in terms of increase in dry weight, production of new cells at the apical meristem, cell expansion, and protein synthesis.
07% did not inhibit the growth of seedling tomato roots receiving their sugar supply by phloem transport from the seed. These observations, and the independent evidence that phlorizin inhibits phosphorylation reactions (169, 180, 363, 454, 565) suggested that its inhibitory action on the growth of excised roots was a consequence of its inhibiting a phosphorylating reaction involved in the mechanism of sucrose uptake from an external culture solution. This view agreed with the demonstration that phosphorus-deficient cultured roots had an impaired ability to absorb sugar.