INVESTIGADORES
CARBONELL SILLETTA Luisina Marta
congresos y reuniones científicas
Título:
Irrigation and fertilization decrease freezing tolerance of the shrub Senecio filaginoides in the patagonian steppe.
Autor/es:
LUISINA MARTA CARBONELL SILLETTA; NADIA SOLEDAD ARIAS; AGUSTÍN CAVALLARO; FABIÁN SCHOLZ; GUILLERMO GOLDSTEIN; SANDRA BUCCI
Lugar:
Madison, Wisconsin
Reunión:
Seminario; 11th International Plant Cold Hardiness Seminar. Importance of Cold Hardiness in a Warming Climate; 2018
Institución organizadora:
University of Wisconsin-Madison
Resumen:
In Patagonia the asynchrony between water availability and optimum growth temperatures, low nutrient availability and the high intensities of wind, are the main variables that shape plant life forms. The objective of this study was to determine freezing resistance of a evergreen shrub species (Senecio filaginoides) under different water and fertilization treatments in a patagonian steppe. The experiment carried out in 20 plots of 25x25 m with four treatments: control (C), irrigation (I), fertilization (F) and I+F. We determined leaf lethal damage (LT50), ice nucleation temperature (INT), leaf relative water content (RWC) and aboveground growth in 4 plants of S. filaginoides per treatment. We observed that leaf INT exhibited similar values in all the treatments (between -7°C and 8°C), while the largest differences were observed in LT50 values. A 70% of cell membrane damage (LT50) at -25°C and higher leaf RWC was observed in I+F and F treatments. We found a positive linear correlation between leaf RWC and LT50. Aboveground biomass increased under I+F and F treatments. The results suggest that F and I+F treatments decrease frost resistance in this shrub species. Higher amount of freezable water increases cell membrane damage. Higher water availability in plants has detrimental effects on leaf freezing resistance but these effects could be compensated by increase growth rate during the warm season.