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Cation fluxes in the saps of Sinapis alba during the floral transition
Author(s) -
Havelange A.,
Bernier G.
Publication year - 1993
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1993.tb01741.x
Subject(s) - exudate , sinapis , phloem , apoplast , botany , stele , biology , chemistry , horticulture , biophysics , cell wall , brassica
Plants of Sinapis alba L. were induced to flower by either a single long day or a single displaced short day. The levels of three cations. Ca 2+ , Mg 2+ and K + , were measured by atomic absorption spectrophotometry in exudates from roots, leaves and apical stem tips. The export of all three cations out of the root system (root exudate) was increased in induced as compared to non‐induced plants. No changes were observed in cation export out of the mature leaves (leaf exudate). The supply of cations to the apical bud (apical exudate) did not originate from the phloem and, so, should mainly be of apoplastic origin. Only the supply of Ca 2+ to the apical bud was increased, not the supply of Mg 2+ or K + . The increase in Ca 2+ supply was transient and occurred at about the same time as a conspicuous stimulation of cell division, previously detected in the apical bud.