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Intrapopulation variation in the breeding system of Villarsia lasiosperma (Menyanthaceae), a distylous species
Plant Systematics and Evolution
Vol. 180, No. 3/4 (1992), pp. 227-233
Published by: Springer
Stable URL: http://www.jstor.org/stable/23674730
Page Count: 7
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The restricted perennial diploid herb, Villarsia lasiosperma, of southwestern Western Australia has distylous flowers with dimorphism in style and stamen length, stigma morphology, and pollen size. In order to assess the presence and nature of an incompatibility system in this species, a crossing program was carried out using 17 plants grown from seeds collected in two field populations. Pollen stainabilities of these plants mostly exceeded 95%. Mean seed-set of Longs following intermorph pollinations was c. 24 seeds per pollination and for Shorts was c. 16 seeds per pollination. Approximately three-quarters of the Longs and Shorts produced no seeds after self-pollination; the remainder produced very few seeds following such pollinations. No Shorts produced seeds after intramorph cross-pollinations. However, about half the Longs exhibited various levels of weakened intramorph incompatibility, with mean seed-sets following intramorph cross-pollinations up to half the mean seed-sets following intermorph pollinations. In the behavior of Longs, the incompatibility system of V. lasiosperma differs from the idealized distylous breeding system, but resembles that of a purported close relative, V. exaltata of eastern and southeastern Australia.
Plant Systematics and Evolution © 1992 Springer