Study on the breeding system of the rare plant Ammodendron argenteum

Based on the observation of the sample plants in the plot and indoor analysis,with the focus on the outcrossing index,pollen-ovule ratio,pollen vitality,and stigma receptivity under natural condition and artificial pollination and bagging,a systematic research on the breeding system of Ammodendron argenteum was conducted. The results showed that the blooming period lasted seven to eleven days. By the flower's morphology and pollen dehiscence,i. e.,the flowering process for one flower of this species could be divided into four periods: bud swelling,pre-dehiscence,dehiscence,and flower withering.Based on the artificial bagging and pollination experiments,its breeding system of outcrossing chiefly and self compatible partially was determined,and pollinators was needed during the pollination process,there was no apomixes.