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Nutrient translocation pattern and accumulation of free amino acids in rice coleoptile elongation under anoxia
Author(s) -
Menegus Faustino,
Brambilla Ida,
Bertani Alcide
Publication year - 1984
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.1399-3054.1984.tb05897.x
Subject(s) - coleoptile , chromosomal translocation , oryza sativa , anoxic waters , amino acid , phosphorus , nutrient , elongation , shoot , biology , hexose , oxygen , botany , biochemistry , chemistry , ecology , materials science , organic chemistry , ultimate tensile strength , metallurgy , gene , enzyme
Comparing nutrient translocation to the rice ( Oryza sativa L. var. Arborio ) shoot during anoxia with the aerobic situation, it was found that anoxia reduced the translocation of K + , phosphorus, Mg 2+ and Ca 2+ with progressive intensity; Ca 2+ translocation was practically zero in the absence of oxygen. The translocation of K + and phosphorus under anoxia was still considerable and contributed to the maintenance of a high osmotic potential while the blocking of Ca 2+ translocation caused a decrease in its concentration in the anoxic coleoptile, possibly favouring high cell wall plasticity in that organ. As anoxia proceeded, amino acids, no longer employed in protein synthesis, accumulated in the coleoptile, reaching spectacular levels [51 mmol kg of tissue‐water) −1 ] and, after 48 h of anoxia, their contribution to the osmotic potential was 80% of that of K + , as against less than 20% in all aerobic treatments. Anoxia caused a reduction in soluble hexose concentrations which, however, were more than compensated osmotically by the accumulation of amino acids.