Influence of nitrate-nitrogen and ammonium-nitrogen on calcium (45Ca2+) absorption in sorghum root tips
Titel:
Influence of nitrate-nitrogen and ammonium-nitrogen on calcium (45Ca2+) absorption in sorghum root tips
Auteur:
Wilkinson, R. E. Duncan, R. R.
Verschenen in:
Journal of plant nutrition
Paginering:
Jaargang 16 (1993) nr. 10 pagina's 1995-2000
Jaar:
1993-10
Inhoud:
Root-tip, 1-cm of Sorghum bicolor (L.) Moench cv SC283, SC574, GP-10, and Funk G522DR were exposed to calcium (45Ca2+) at pH 5.5 for 2-hr in the presence of nitrate-nitrogen (NO3--N) or ammonium-nitrogen (NH4+-N). Nitrate (0.1 mM) induced significantly increased 45Ca uptake in Funk G522DR, SC283, and GP-10 while 0.01 mM NO3--N induced significantly increased 45Ca'uptake in SC574, but 45Ca absorption was significantly decreased at 1 mM NO3—N. In the presence of the NH4+ ion, 45Ca uptake was increased up to 8X that of the NH4+-N untreated roots. When ammonium chloride (NH4CI) was used, the Cl- tended to induce an increased 45Ca uptake. Cultivar variation was present.
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