Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Intrapopulation variation in the breeding system of Villarsia lasiosperma (Menyanthaceae), a distylous species

Robert Ornduff
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
  • More info
  • Cite this Item
Intrapopulation variation in the breeding system of Villarsia lasiosperma (Menyanthaceae), a distylous species
Preview not available

Abstract

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.

Page Thumbnails

  • Thumbnail: Page 
[227]
    [227]
  • Thumbnail: Page 
228
    228
  • Thumbnail: Page 
[229]
    [229]
  • Thumbnail: Page 
230
    230
  • Thumbnail: Page 
231
    231
  • Thumbnail: Page 
232
    232
  • Thumbnail: Page 
233
    233