IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
artículos
Título:
Oxygen deficiency and salinity affect cell-specific ion concentrations in adventitious roots of barley (Hordeum vulgare L.)
Autor/es:
KOTULA L; CLODE P; STRIKER GG; PEDERSEN O; LAUCHLI A; SHABALA S; COLMER TD
Revista:
NEW PHYTOLOGIST
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2015 vol. 208 p. 1114 - 1125
ISSN:
0028-646X
Resumen:
O2 deficiency associated with soil waterlogging adversely impacts root respiration and nutrient acquisition. We investigated the effects of O2deficiency and salinity (100 mM NaCl) on radial O2 concentrations and cell-specific ion distributionsin adventitious roots of barley. Microelectrode profiling measured O2 concentrations across roots in aerated, aerated saline, stagnant or stagnant saline media. X-ray microanalysis at two positions behind the apex determined cell-specific elemental concentrations of K, Na and Cl across roots. Severe O2 deficiency occurred in the stele and apical regions of roots in stagnant solutions. O2 deficiency in the stele reduced the concentrationsof K, Na and Cl in the pericycle and xylem parenchyma cells at the subapical region. Near the root apex, Na declined across the cortex in roots from aerated saline solution but was relatively high in all cell types in roots from stagnant saline solution. O2 deficiency has a substantial impact on cellular ion concentrations. Both pericycle and xylem parenchyma cells are involved in energy-dependent K loading into the xylem as well as in controlling radial Na and Cl transport. At root tips, accumulation of Na in the outer cell layers likely contributed to reduction of Na in inner cells of the tips.