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The Effect of Calcium on the Uptake and Distribution of Sodium in Excised Barley Roots
Author(s) -
NEIRINCKX L.,
STASSART J. M.
Publication year - 1979
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.1399-3054.1979.tb06519.x
Subject(s) - calcium , sodium , hordeum vulgare , apex (geometry) , flame photometry , chemistry , botany , poaceae , horticulture , biology , organic chemistry
The total uptake and relative distribution of Na + along the root was investigated in excised barley roots ( Hordeum vulgare L. cv. Union) of 6‐day‐old plants cultured on 0.25 m M CaSO 4 . One technique involved cutting the roots at harvest time after different uptake periods into different segments each 2 cm long. These segments were ashed and sodium was measured by flame photometry. For each experiment two treatments were done, one containing calcium in the uptake solution and one without calcium. A second technique involved the measurement of sodium transport, using labelled 22 Na + solution. Although no significant differences could be found between the calcium containing and the calciumless treatments at 24 h, there were clearcut differences for the first 6 to 8 h. The effect of calcium on the first stages of the sodium uptake was a large accumulation of sodium in the part close to the apex with a translocation close to nil; whereas the sodium taken up in the absence of calcium did not accumulate in such large amounts in the apex region but was immediately transported basipetally.