Effect of Exogenously Supplied Foliar Potassium on Phloem Loading in Beta vulgaris L. 1
AUTOR(ES)
Doman, Diane C.
RESUMO
The effect of foliar application of K+ on processes associated with phloem loading was investigated in source leaves of sugar beet (Beta vulgaris L.). KCI was supplied exogenously at concentrations of up to 100 millimolar in the solution bathing the abraded upper epidermis of source leaves. K+ added at concentrations below 30 millimolar generally promoted the rate of export of material derived from 14CO2 but not from exogenously applied [14C]sucrose. Paralleling promotion of export, the level of material derived from photosynthesis, which was released into the bathing solution, also increased in response to addition of K+ to the free space. Net photosynthetic rate was not affected. K+ at 5 and 15 millimolar concentrations did not stimulate uptake of [14C]sucrose into source leaf discs.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=543131Documentos Relacionados
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