【摘要】 对分布在天津滨海滩涂的互花米草(Spartina alterniflora Loisel.)在开花、授粉、结实等方面进行了研究,结果表明:互花米草花期从8月中旬开始至10月下旬结束,花粉/胚珠(P/O)值为9874.67±2149.39,花粉粒小,适于风媒传粉;花粉活力随着散粉时间的延长呈指数递减,柱头具有适于捕捉花粉的特性,体外花粉管的生长表明,花粉的萌发能力较强;平均结实率为(67.56±2.39)%,种子萌发率高于80%,种子繁殖为种群的拓殖及补充起到重要作用。更多还原

【Abstract】 An investigation was made on the reproductive traits such as flowering,pollination,and seed-setting of smooth cordgrass(Spartina alterniflora Loisel.) in Tianjin coastal wetland.The results showed that the flowering of the grass initiated in mid-August,and senescence occurred by the end of October.S.alterniflora was a wind-pollinated grass,which was revealed by the adaptation of higher pollen/ovule ratio(P/O)(9874.67±2149.39) and the small pollen grains.Pollen viability presented an exponential downtrend with the time of pollen release,and the character of stigma adapted to capturing pollen grains.The exterior pollen tube growth following pollination showed the high capability of pollen germination.The average seed-setting rate was(67.56±2.39)% and the seed germination rate was above 80%,which was important for the population colonization and recruitment.更多还原