منابع مشابه
Phloem mobility of magnesium.
Magnesium-28 was applied to specific leaves of bean (Phaseolus vulgaris) and barley (Hordeum vulgare) plants. After 24 hours, as much as 7% of the absorbed Mg was exported from the treated bean leaves and 11% was transported basipetally from the treated zone of the barley leaves. Transport of Mg did not occur past a heat-killed section of the treated leaf, thereby indicating that translocation ...
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A passive diffusion model has been developed which simultaneously accounts for the dependence of phloem mobility on permeability and acid dissociation. The model is consistent with the observation that the addition of an acid moiety to an otherwise phloem immobile compound may enhance that compound's ability to move in the phloem. However, acid trapping in the basic phloem is not the only enhan...
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HISTOLOGY. Roy 0. Greep, Ed. New York, Blakiston, 1954. 953 pp., 648 figs., $15.00. This massive textbook of histology marks a new departure from the usual text. It began as a sixth edition of the text by Bremer and Weatherford and ended as a completely new book, both as to text and as to most of the illustrations. In addition, the chapters have been written by thirteen different contributors, ...
متن کاملPhloem transport in trees.
Phloem is like an enigmatic central banker: we know how important phloem is to plant function, but very little about how phloem functions as part of a whole-plant economy. Phloem transports carbohydrates, produced by photosynthesis and hydrolysis of reserve compounds, to sink tissues for growth, respiration and storage. At photosynthetic tissues, carbohydrates are loaded into phloem (Rennie and...
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ژورنال
عنوان ژورنال: Botanical Gazette
سال: 1919
ISSN: 0006-8071
DOI: 10.1086/332460