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Inbreeding Depression in Partially Self-Fertilizing Phlox

Donald A. Levin
Evolution
Vol. 43, No. 7 (Nov., 1989), pp. 1417-1423
DOI: 10.2307/2409457
Stable URL: http://www.jstor.org/stable/2409457
Page Count: 7
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Inbreeding Depression in Partially Self-Fertilizing Phlox
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Abstract

Inbreeding depression was measured in terms of the relative survivorship of self versus cross seed in 14 Phlox drummondii cultivars and 10 populations of P cuspidata. The cultivars are predominantly outcrossing; P. cuspidata is predominantly self-fertilizing. The relative survivorship of self versus cross seed averages 0.84 in the cultivars and 0.99 in P cuspidata. In wild P. drummondii, the average is 0.83. The mean number of lethal equivalents per zygote averages 0.69 in the cultivars and 0.05 in P cuspidata, versus 0.79 in the wild P. drummondii. There is a significant negative correlation between the amount of automatic self-seed produced by a cultivar and the number of lethal equivalents it carries (r = -0.60). Phlox cuspidata has a lower level of cross-seed abortion than P drummondii, which probably is not due to a difference in the incidence of lethal genes in their populations.

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