منابع مشابه
Phloem Mobility of Xenobiotics
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...
متن کاملPhloem 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 ...
متن کاملSwept Away: Protein Mobility in the Phloem.
Transport of macromolecules through the phloemhas received increasing interest since thediscovery thatFLOWERINGLOCUST(FT) moves from leaves to the shoot apical meristem, where it induces flowering (Corbesier et al., 2007), indicating thatmacromolecules such as proteins andRNAcan act asmobile regulators of gene expression in distant tissues. Indeed,Molnaretal. (2010)usedgrafting between Arabidop...
متن کاملPhloem Mobility and Stability of Sucrose Transporter Transcripts
Sucrose transporters are essential membrane proteins for the distribution of photoassimilates in higher plants. In Solanaceous species the proteins of all known sucrose transporters are co-localized in enucleate sieve elements and undergo permanent turnover. The mRNA of the sucrose transporter StSUT1 is localized in both, sieve elements and companion cells. Sucrose transporter mRNAs have been d...
متن کاملComparative Phloem mobility of nickel in nonsenescent plants.
(63)Ni was applied to nonsenescent source leaves and found to be transported to sink tissues in pea (Pisum sativum L.) and geranium plants (Pelargonium zonale L.). The comparative mobilities (percent tracer transported out of source leaf /% (86)Rb transported) for (63)Ni in peas was 2.12 and in geranium 0.25. The value for the phloem mobile (86)Rb was 1.00. By contrast, the comparative mobility...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1988
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.86.3.811