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The importance of being the first pollen in the strobili of Scots pine

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Timing of pollen arrival may affect the level of seeds fertilized by pollen from outside seed orchards, especially in seed orchards of Scots pine (Pinus sylvestris L.) established in southern Finland with stock from northern populations. We performed sequential pollination experiments with Scots pine pollen collected from seed orchard clones originating from southern and northern Finland and recipient strobili in clones originating from southern Finland. When southern pollen was introduced first, seeds were sired equally by northern and southern genotypes. When northern pollen was introduced first, northern genotypes were found in 75% of the resulting seeds. When both pollen types were introduced at the same time, the resulting seed crop was split almost equally between northern and southern genotypes. These results do not unconditionally support the idea that the first pollen grain in the pollen chamber always fertilizes the ovum; instead, they suggest a more complex way of competition between pollen grains.

Le moment où le pollen arrive peut affecter la quantité de graines fertilisées par le pollen provenant de l’extérieur des vergers à graines, particulièrement dans les vergers à graines de pin sylvestre (Pinus sylvestris L.) établis dans le sud de la Finlande avec du matériel provenant de populations nordiques. Nous avons réalisé des expériences de pollinisation séquentielle avec du pollen de pin sylvestre collecté dans des vergers à graines de clones originaires du sud et du nord de la Finlande et des strobiles récepteurs chez des clones originaires du sud de la Finlande. Lorsque le pollen provenant du nord était introduit en premier, 75 % des graines produites correspondaient aux génotypes du nord. Lorsque les deux types de pollen étaient introduits en même temps, les graines étaient réparties presque également entre les génotypes du nord et du sud. Ces résultats ne supportent pas inconditionnellement l’idée que le premier grain de pollen dans la chambre pollinique fertilise toujours l’ovule. Au contraire, ils laissent entrevoir un mécanisme plus complexe de compétition entre les grains de pollen.

Document Type: Research Article

Publication date: 2008-12-01

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