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Mentor Effects in the Genus Hieracium s.str. (Compositae, Lactuceae)

Patrik Mráz
Folia Geobotanica
Vol. 38, No. 3 (Sep., 2003), pp. 345-350
Published by: Springer
Stable URL: http://www.jstor.org/stable/25133997
Page Count: 6
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Mentor Effects in the Genus Hieracium s.str. (Compositae, Lactuceae)
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Abstract

Self-incompatibility was demonstrated in the diploid taxa Hieracium alpinum and H. umbellatum using isolation experiments. However, self-incompatibility was broken down in diploid H. alpinum under the influence of foreign pollen from another species of this genus (mentor effects) during a series of crossing experiments. Interestingly, failure of the SI system was also recorded in diploid H. alpinum in an intergeneric cross with the representative of the closely related genus of Pilosella. This is the first record of autogamy in the genus Hieracium s.str. The possible evolutionary significance of this phenomenon is discussed.

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