Dispersal distances and predation rates of sexual and asexual propagules of Allium vineale L.
Evidence against a frequency dependent advantage for sexual reproduction in Allium vineale. Am.
Distance dependent performance of asexual propagules Allium vineale. Am.
Because Allium vineale roots produce few branches and tend to grow vertically in the soil, circular pots 3.8 cm in diameter, and 21 cm deep were used (Conetainers, Stuewe, and Sons, Inc., Corvallis, Oregon, USA).
For Allium vineale plants, the impact of mycorrhizal infection varies significantly with life stage.
As seen in some other species (e.g., Hepper, 1983; Jensen, 1983; Thomson et al., 1986; Schroeder and Janos, 2004; see also Smith and Smith, 1996), the percent of Allium vineale roots colonized by mycorrhizae was significantly lower at higher levels of P after 6 mo of growth.
As larger bulbs produce greater numbers of flowers and bulbils the following year (Ronsheim, 1997), this increase in bulb size is likely to translate into greater lifetime fitness, and this benefit may be increased further if the specific fungal associates of Allium vineale are present.
The results from this study indicate that, within this population of Allium vineale, spatial heterogeneity in P in the field is likely to result in the plant-mycorrhizal association ranging from beneficial to neutral in its effect on plant growth and reproduction.
Evidence against a frequency-dependent advantage for sexual reproduction in Allium vineale. Am.
Distance-dependent performance of asexual progeny in Allium vineale (Liliaceae).