Artículo
Early F-actin disorganization may be signaling vacuole disruption in incompatible pollen tubes of Nicotiana alata
Fecha de publicación:
10/2014
Editorial:
Landes Bioscience
Revista:
Plant Signaling & Behavior
ISSN:
1559-2316
e-ISSN:
1559-2324
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Self-incompatibility (SI) systems appeared early in plant evolution as an effective mechanism to promote outcrossing and avoid inbreeding depression. These systems prevent self-fertilization by the recognition and rejection of self-pollen and pollen from closely related individuals. The most widespread SI system is based on the action of a pistil ribonuclease, the S-RNase, which recognizes and rejects incompatible pollen. S-RNases are endocyted by pollen tubes and stored into vacuoles. By a mechanism that is still unknown, these vacuoles are selectively disrupted in incompatible pollen, releasing S-RNases into the cytoplasm and allowing degradation of pollen RNA. Recently, we have studied the timing of in vivo alterations of pollen F-actin cytoskeleton after incompatible pollinations. Besides being essential for pollen growth, F-actin cytoskeleton is a very dynamic cellular component. Changes in F-actin organization are known to be capable of transducing signaling events in many cellular processes. Early after pollination, F-actin showed a progressive disorganization in incompatible pollen tubes. However by the time the F-actin was almost completely disrupted, the large majority of vacuolar compartments were still intact. These results indicate that in incompatible pollen tubes F-actin disorganization precedes vacuolar disruption. They also suggest that F-actin may act as an early transducer of signals triggering the rejection of incompatible pollen.
Palabras clave:
F-actin
,
Pollen
,
Signaling
,
S-RNase
,
Vacuole
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CIQUIBIC)
Articulos de CENTRO DE INVEST.EN QCA.BIOL.DE CORDOBA (P)
Articulos de CENTRO DE INVEST.EN QCA.BIOL.DE CORDOBA (P)
Citación
Goldraij, Ariel; Roldán, Juan Alfredo; Rojas, Hernan Javier; Early F-actin disorganization may be signaling vacuole disruption in incompatible pollen tubes of Nicotiana alata; Landes Bioscience; Plant Signaling & Behavior; 7; 12; 10-2014; 1695-1697
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