Dormancy/germination physiology and seedling emergence patterns of endan-geredPrimula mallophylla (Primulaceae)
The species ofPrimula mallophylla (Primulaceae), which had disappeared for almost 100 years and assumed extinct, was surprisingly rediscovered in 2006. The only extant extremely small population was found in the Daba Mountain of Chengkou County in northeast Chongqing, west China, implying that thorough inves-tigation and conversation must be immediately conducted. On the basis of the dormancy/germination responses of seeds to temperature and light, the dynamics of seedling emergence ofP. mallophylla was investigated in this study. Newly collected seeds were with non-deep physiological dormancy. The dormancy-broken seeds by 60 d cold stratiifcation (5°C) could germinate well only under the combination of light and appropriate temperatures. Soil cover signiifcantly inhibited the germination of this species. The seeds were demonstrated to have a light requirement even after experiencing moist chilling, which might facilitate the incorporation of the seeds into the soil seed bank. In the ifeld where illumination was fully provided, the seasonal patterns of seedling emergence with a peak between April and June was enslaved to the seasonal change trend of both temperature and precipi-tation in this subalpine region.
NETL
NSTL
万方数据
维普
