华北驼绒藜开花生物学特性研究

对华北驼绒藜的开花生物学特性进行了具体调查统计研究.结果显示,华北驼绒藜种群形成了一系列适应风媒传粉的花部特征:单性花,雌雄同株;雄花序细长而柔软,雄蕊4枚,无苞片;雌花小,无花冠,柱头指状,具有大量乳突细胞,便于捕捉花粉;居群内同一植株雌、雄花花期不一致性较高,花期不遇;每枝条雄花开花持续时间频率最高为7 d,而雌花开花持续时间频率最高为6 d;雌、雄花序呈单峰连续集中开花式样;雌、雄花始花时间与花期长度均呈极显著负相关(雌花r=-0.569,P＜0.01;雄花r=-0.665,P＜0.01),开花数与花期长度则为显著正相关关系(r=0.083,P＜0.01),(r=0.346,P＜0.01).研究表明,华北驼绒藜在长期的进化过程中,形成了同株雌、雄花花期不遇的生殖策略,因而减少了同株授粉的比例,提高了结实率.

Flowering Phenology of Ceratoides arborescens

Flowering phenology of Ceratoides arborescens was studied.The results showed:The flowers had many characters of anemophily.It is unisexual,male and female flowers are in the same plant,femal inflorescence is long and soft.Male flower is small,finger-shaped stigma,have many papilla cells,which are easy to catch pollinations,as far as individual in a population.The inconsistency of burst time is relatively high between male and female flowers.The inconsistency of inflorescence is relatively high among differe...