Letter | Published:

Co-existence of Positive and Negative Heterosis in a Single Plant Organ

Naturevolume 169pages10541055 (1952) | Download Citation



IN the course of a comparative study of leaf-shape in certain F1 hybrids and their parents, the flowering currants Ribes sanguineum Pursh, R. odoratum Wendl. and their hybrid R. × gordonianum Lem. were investigated. Mean leaf-shapes were derived by methods published earlier1,2, polar co-ordinates being used for the Ribes leaves. The mean leaf outlines shown in the accompanying illustration are plotted on a uniform scale for convenience of comparison. The actual mean lengths from the origin O to the apex P are: R. sanguineum 4.3 cm., R. × gordonianum 3.9 cm., R. odoratum 2.8 cm.

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  1. 1

    Melville, R., Ann. Bot., N.S., 1, 673 (1937).

  2. 2

    Melville, R., Proc. Linn. Soc. Lond., 162, 158 (1951).

  3. 3

    Powers, L., Amer. Nat., 78, 277 (1944).

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  1. Royal Botanic Gardens, Kew



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