Data di Pubblicazione:
2007
Citazione:
Iron deficiency differently affects metabolic responses in soybean roots / G. Zocchi, P. De Nisi, M. Dell'Orto, L. Espen, P. Marino Gallina. - In: JOURNAL OF EXPERIMENTAL BOTANY. - ISSN 0022-0957. - 58:5(2007 Jan 17), pp. 993-1000.
Abstract:
Iron deficiency responses were investigated in roots of soybean, a Strategy I plant species. Soybean responds to iron deficiency by decreasing growth, both at the root and shoot level. Chlorotic symptoms in younger leaves were evident after a few days of iron deficiency, with chlorophyll content being dramatically decreased.
Moreover, several important differences were found as compared with other species belonging to the same Strategy I. The main differences are (i) a lower capacity to acidify the hydroponic culture medium, that was also reflected by a lower H+-ATPase activity as determined
in a plasma membrane-enriched fraction
isolated from the roots; (ii) a drastically reduced activity of the phosphoenolpyruvate carboxylase enzyme; (iii) a decrease in both cytosolic and vacuolar pHs; (iv) an increase in the vacuolar phosphate concentration,
and (v) an increased exudation of organic
carbon, particularly citrate, phenolics, and amino
acids. Apparently, in soybean roots, some of the
responses to iron deficiency, such as the acidification of the rhizosphere and other related processes, do not occur or occur only at a lower degree. These results suggest that the biochemical mechanisms induced by this nutritional disorder are differently regulated in
this plant. A possible role of inorganic phosphate
in the balance of intracellular pHs is also discussed.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Fe(III)-chelate reductase ; Glycine max L. ;
intracellular pH ; iron deficiency ; PM H+-ATPase
Elenco autori:
G. Zocchi, P. De Nisi, M. Dell'Orto, L. Espen, P. Marino Gallina
Link alla scheda completa: