
handle: 10261/136079
[ES] Se ha estudiado la germinación del polen de melocotonero tanto 'in vitro' corno 'in vivo'. Al hidratarse el grano de polen o tras la emisión del tubo polínico tiene lugar una difusión de proteínas. Las proteínas de la exina se difunden a los 30 segundos de la hidratación y las de la intina pasados 1 ó 2 minutos. El grano de polen germina y emite un tubo polínico que crece en el estigma a una velocidad de 59 μm/h. A las 15 horas de la polinización, el tubo polínico entra en el tejido transmisor, forma la primera placa de calosa y acelera su crecimiento. Estos hechos se han relacionado con el cambio de crecimiento autótrofo a heterótrofo.
'In vitro' and 'in vivo' pollen grain germination in peach has been studied. Proteins diffuse faIlowing pollen grain hydration or pollen tube formation. Exine proteins diffuse 30 seconds following hydration and those of the intine 1 or 2 minutes later. Pollen grain germinates and produces a tube that grows on the stigma at 59 μm/h. Fifteen hours after pollination the pollen tube enters the transmitting tissue, forms the first callose plug and acclerates its growth. These events are related to the change from autotrophic to heterotrophic growth.
Agradecemos a CAYCYT la financiación de este trabajo y la concesión de una beca a A. Arbeloa.
7 Pags.- 6 Fots.
Peer reviewed
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