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Shattering in Lettuce-Its Inheritance and Biological Significance

Thomas W. Whitaker and Gilbert D. McCollum
Bulletin of the Torrey Botanical Club
Vol. 81, No. 2 (Mar. - Apr., 1954), pp. 104-110
Published by: Torrey Botanical Society
DOI: 10.2307/2481843
Stable URL: http://www.jstor.org/stable/2481843
Page Count: 7
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Abstract

1. The shattering character in lettuce is described and shown to be the expression of a single dominant gene. In general, it is found only in wild lettuce, Lactuca serriola. The recessive allele (non-shattering) is for the most part restricted to cultivated varieties. Shattering is not linked with either achene color or leaf lobing. 2. Indirect evidence suggests that shattering is of considerable importance to the species under non-cultivated conditions. On the contrary, under cultivated conditions, non-shattering is the favored type, and shattering becomes detrimental. It is pointed out that loss of natural adaptations for the dissemination of seeds has occurred in many cultivated plants.

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