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fruitandnuteducation.ucdavis.edu/genera...ation1/

Pollination occurs when pollen grains move from anthers to a reproductively mature stigma. After pollen lands on the stigma, it initiates pollen tube formation. Pollen tubes are channels which grow down the length of the style to the ovules. After a pollen grain travels down a pollen tube it intercepts an ovule, fertilizes the female germ cells and initiates seed development.