VISUAL INDICATIONS OF S<sup>35</sup> AND P<sup>32</sup> TRANSLOCATION IN THE PHLOEM

Biddulph, Susann

doi:10.1002/j.1537-2197.1956.tb10475.x

Cited by 60 publications

(16 citation statements)

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“…Biddulph (3) has studied the translocation of S35 and p32 introduced into a bean leaf by means of a flap cut so that the initial movement was toward the periphery of the leaf and from there through intact veins into the petiole (2). After a migration period of 1 hour she found that in the stem below the treated leaf, both isotopes were concentrated in the phloem.…”

Section: Methodsmentioning

confidence: 99%

Selective translocation of products of photosynthesis in soybean

et al. 1961

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Section: Methodsmentioning

confidence: 99%

Selective translocation of products of photosynthesis in soybean

et al. 1961

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“…The 10 mM H3P*04 solution injured the sprayed leaflet and only 4.7 % of the applied phosphorus was exported. About 6 (13). They attributed the increased effectiveness of absorption andl translocation at the lower pH to a suppression of the dissociation of phosphoric acid, and to a possible direct effect on the permeability of the adjacent cells.…”

Section: Comparison Of Three Application -Methodsmentioning

confidence: 99%

“…The results are shown in figure 6. The moisture retention was determined in the same manner as before, except that one drop of the additives was included after the initial weighings.…”

Section: Comparison Of Three Application -Methodsmentioning

confidence: 99%

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Factors Affecting Absorption and Translocation of Foliar Applied Phosphorus.

Koontz

Biddulph

1957

Plant Physiol.

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Phosphorus is known to be exported from leaves of apple (8,9,10), bean (4,6,11,12,13), chrysanthemum (1, 2), corn (11,12), tomato (12) and squash (71). The present work with bean plants compares export following application by spray, leaf vein injection (4) and droplet (13) methods. Other factors investigated which affect absorption and subsequent translocation of the spray-applied phosphorus include: 1) wetting agents, 2) phosphorus concentration of the spray, 3) leaf surface (upper vs lower surface), 4) different phosphorus compounds (pH and cation), 5) time, 6) hygroscopic agent, 7) size of area sprayed, 8) age and position of sprayed leaf, and 9) phosphorus level of the plant. METHODSRed Kidney bean plants grown in one-half strength Hoagland solution under fluorescent lights on a 6:00 A.2I. to 6:00 P.NI. day were used throughout. The light intensity, temperature and relative humidity were 1000 ft-c (as measured half-way up the stem), 240 ± 1°C and 60 % + 4 %, respectively. At least two plants were used for each treatment. To obtain more uniform plants, the axillary buds were removed before vascularization was pronounced, 2 and 3 days before treatment.The phosphorus solutions containing 0.2 ml of P32-labeled phosphorus of known specific activity were sprayed onto the upper surface of the terminal leaflet of the first trifoliate leaf, unless stated otherwise, between 9:00 and 11:00 A.NM. when the plants were 18 days old (12 days after the hypocotyls had straightened). To prevent contamination of the remainder of the plant the leaflet receiving the spray was enelosed in a clear plastic box which was removed several minutes after treatment. Except in the time eourse of uptake experiments, the plants were harvested and sectioned 24 hours after the application of the tracer. Usually each plant was sectioned into three parts: 1) the sprayed leaflet, 2) the remaining two leaflets and petiole of the first trifoliate leaf, 3) and the remainder of the plant. In some cases the remainder of the plant was divided at the node of the first trifoliate leaf to obtain the upward and (lownward movement. The amount of phosphorus applied was determined by summation. The percentage of applied phosphorus which moved into the nutrient solution was negligible (about 0.03 %) and was not determined in most experiments.

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“…Initial penetration most likely involves passage through the cuticle and epidermal cells (17,20); stomata may also play a minor role (15). Transport of foliar absorbed nutrients undoubtedly occurs via the phloem (2,3,4,14). While the rate and amount of transport varies with each element, it parallels the phenomenon of nutrient redistribution as described by Biddulph (2) and Williams (19).…”

mentioning

confidence: 91%