驼绒藜属3种植物开花习性及雌花柱头微形态研究

研究驼绒藜属3种植物开花规律、开花日动态、结实率及柱头微形态。结果表明,华北驼绒藜和驼绒藜雄花开花高峰均在上午8:00～10:00,有利于传粉和受精,而北美驼绒藜雄花在中午11:00～13:00达开放高峰,其雌雄花开花高峰期不一致,不利于传粉、受精,从而降低结实率。三者的开花最适温度基本一致,都在20～24℃。三者的雌花均在下午14:00左右达到开放高峰。雌花柱头微形态研究结果表明,华北驼绒藜的柱头有利于接受花粉,而北美驼绒藜的柱头不利于接受花粉。此外,华北驼绒藜与驼绒藜的雌、雄花花期相遇结实率较高,而北美驼绒藜因花期不遇,故导致结实率低。

Study on Flowering Habit and Stigma Micromorphology of Three Ceratoides Species

A study of 3 Ceratoides species for their flowering habit, daily flowering dynamic change, fertility, and stigma micromorphology shows that the male flowers of C.arborescens and C.lanata reach their full bloom at 8:00-10:00, while the male flowering peak of C.lanata falls on 11:00-13:00. The bloom peak of the female flowers of all 3 occur at 14:00. Though the most congenial temperature for flowering of all the 3 species is 20～24℃, the female stigma micromorphology of C.arborescens is best suited for gathering pollen than the other 2 species. Therefore, C.arborescens boasts the highest seed bearing rate. Moreover, the flowering period of C.arborescens and C.lanata last longer than that of C.lanata, a fact which also results in the highest seed bearing rate of C.arborescens, and the lowest seed bearing rate of C.lanata.