INVESTIGADORES
LAXALT Ana Maria
congresos y reuniones científicas
Título:
Characterization of acid peptidases secreted by plant-pathogenic fungus Botrytis cinerea
Autor/es:
REVUELTA MV, ARANCIAGA N, CÓRDOBA JP, NEGRÍN L, ORTS F, PÉREZ R, POULSEN HORNUM A, QUIROGA Y, SÁNCHEZ RIZZA L, SCHOENFELD E, LARRECHE R, PODAZA E, ESPINO JJ, LAXALT AM, TEN HAVE A.
Lugar:
Madryn
Reunión:
Congreso; SAIB; 2010
Resumen:
otrytis cinerea causes gray mold, a devastating disease of various
plants of economic interest. This necrotroph grows at moderate
temperatures but also as low as 4°C at which crops are stored.
Infection with B. cinerea depends on cell wall degrading enzymes
such as endopolygalacturonases (ten Have et al., 1998). Cell walls
also contain protein, hence peptidases might also contribute to
virulence. B. cinerea secretes aspartic peptidases (APs, Espino et
al., 2010; ten Have et al., 2004) which act at low pH values, in
correspondence with the low pH reported during B. cinerea
infection (van Kan, 2006). Espino also reported a secreted glutamic
peptidase (GP) and six secreted sedolisins. It is not known how
these enzymes contribute to the secreted peptidase activity. We
used a BcAP8 knock-out mutant, which shows 80% reduction in
secreted peptidase activity to study the spectrum of other peptidase
activities. We detected an inducible GP activity and data suggest
the presence of a sedolisin activity. In planta analysis showed
mostly AP activity and finally we show AP activity at low
temperatures.