title: Peroxynitrite mediates programmed cell death both in papillar cells and in self-incompatible pollen in the olive (Olea europaea L.).
abstract: Programmed cell death (PCD) has been found to be induced after pollination both in papillar cells and in self-incompatible pollen in the olive (Olea europaea L.). Reactive oxygen species (ROS) and nitric oxide (NO) are known to be produced in the pistil and pollen during pollination but their contribution to PCD has so far remained elusive. The possible role of ROS and NO was investigated in olive pollen-pistil interaction during free and controlled pollination and it was found that bidirectional interaction appears to exist between the pollen and the stigma, which seems to regulate ROS and NO production. Biochemical evidence strongly suggesting that both O(2)(-) and NO are essential for triggering PCD in self-incompatibility processes was also obtained. It was observed for the first time that peroxynitrite, a powerful oxidizing and nitrating agent generated during a rapid reaction between O(2)(-) and NO, is produced during pollination and that this is related to an increase in protein nitration which, in turn, is strongly associated with PCD. It may be concluded that peroxynitrite mediates PCD during pollen-pistil interaction in Olea europaea L. both in self-incompatible pollen and papillar cells.
authors.affiliation: Departamento de Bioquímica, Biología Celular y Molecular de Plantas, Estación Experimental del Zaidín, CSIC, Profesor Albareda 1, E-18008 Granada, Spain.
authors.forename: Irene
authors.initials: I
authors.lastname: Serrano
authors.forename: María C
authors.initials: MC
authors.lastname: Romero-Puertas
authors.forename: María
authors.initials: M
authors.lastname: Rodríguez-Serrano
authors.forename: Luisa M
authors.initials: LM
authors.lastname: Sandalio
authors.forename: Adela
authors.initials: A
authors.lastname: Olmedilla
mesh_terms: D017209:Apoptosis / Q000502:physiology; D009569:Nitric Oxide / Q000378:metabolism; D031658:Olea / Q000166:cytology* / Q000378:metabolism*; D030421:Peroxynitrous Acid / Q000378:metabolism*; D011058:Pollen / Q000378:metabolism*; D054817:Pollination / Q000502:physiology; D017382:Reactive Oxygen Species / Q000378:metabolism
chemical_list: D017382:Reactive Oxygen Species; D030421:Peroxynitrous Acid; D009569:Nitric Oxide