Salt tolerance variability among stress-selected Panicum coloratum cv. Klein plants

PITTARO, G; CACERES, LC; BRUNO, C; TOMAS, M; BUSTOS, DA; MONTEOLIVA, MI; ORTEGA, LI; TALEISNIK, EL

GRASS AND FORAGE SCIENCE (PRINT)

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2015 p. 1 - 42

0142-5242

This work assessed intracultivar variability for salt tolerance within Panicum coloratum cv Klein, explored some physiological parameters potentially associated with it, and evaluated the contribution of cell division and expansion to the decreased leaf length observed under salinity Individual plants that had survived severe stress environments in an established pasture were collected and clonal families were obtained by vegetative propagation. These were evaluated in a greenhouse, in pots with an inert substrate irrigated with nutrient solution containing 0, 200 or 400 mM NaCl. Salt tolerance was assessed from growth variables expressed as percentage of non-salinized controls. The selected plants showed higher salt tolerance than plants from the same cultivar obtained from seeds, and variability for salt tolerance was detected within the group, suggesting these plants could be valuable germplasm for breeding programs for saline areas. All selected plants accumulated low blade Na concentrations, and K concentrations tended to remain high under salinity. Changes induced by salinity in carbon fixation, soluble sugars and compatible solutes were measured. A kinematic analysis indicated a reduction in the number of cells in the division-only zone was the main cause for shorter leaves under stress. Though plants showed some differences in all these traits, they were not related to salt-olerance variability within this group of stress-tolerant plants.