Sectorial Patterns in Leaves on Fruit Tree Shoots Produced by Radioactive Assimilates and Solutions |
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Authors: | BARLOW H W B |
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Institution: | East Mailing Research Station East Malling, Maidstone, Kent |
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Abstract: | In vigorously growing shoots of apple and plum 14C-assimilateswere translocated from a fed leaf to particularsectors of other leaves in a distribution pattern associatedwith the phyllotaxis; the same sectorial and distribution patternswere produced by 32P phosphate solution taken into the shootthrough a cut petiole. The frequency with which a given sectorialpattern occurred at a particular position on the phyllotacticspiral was ascertained. Such patterns were not observed abovethe third rolled leaf in the apple shoot apex. Killing the phloem in the petiole prevented egress of labelledassimilate but not of 32P solution. Barkringing above the sourceleaf reduced, but did not completely prevent, assimilate movementup the stem, suggesting some translocation in the xylem. Distribution of label from 45CaCl2, 86RbCl and 3H]asparagine,incorporated through cut petioles, did not follow the same patternas label from 32P solutions. Malus pumila Mill., apple, Prunus domestica L., Prunus insititia. L., leaf plum, patterns, transport of radioisotopes, vascular phyllotaxis |
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