The present invention relates to a lettuce plant (Lactuca sativa L.) resistant against Nasonovia ribisnigri biotype 1 (Nr:1) representative seeds of which were deposited under NCIMB accession number 41763. Such a lettuce plant may be obtainable by crossing a lettuce plant with a plant grown from seeds of seedlot 10G.913569 representative seeds of which were deposited with the NCIMB under NCIMB accession number 41763 and selecting preferably in the F2 progeny of the cross for plants being resistant against Nasonovia ribisnigri biotype 1 (Nr:1).
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