Читать книгу Horticultural Reviews, Volume 49 - Группа авторов - Страница 21

Gametophytic self‐incompatibility seems to be widespread throughout Hydrangea (Reed 2000, 2003, 2004, 2005; Mortreau et al. 2003). Reed (2000, 2004) reported the capacity of self‐pollen to germinate on H. quercifolia stigmas, but not grow long enough to reach the ovaries, except in a very low percentage of cases. Additionally, it was shown that cross‐pollen typically outcompetes self‐pollen when present. The stigmas are receptive to pollen from the day after anthesis until five days post‐anthesis (Reed 2004). The pollen tube grows to the bottom of the style within 48 h after pollination and has fertilized the ovule within 72 h of pollination. It has been shown with H. arborescens and H. macrophylla that pollen is able to be stored at –20°C for at least three months with only a marginal decrease in viability (Kudo and Niimi 1999). However, viability of stored pollen has yet to be confirmed empirically in H. quercifolia.