蒙古莸结实格局研究

Study on the seed setting patterns of Caryopteris mongolica Bunge

基于自然种群和人工种群两年的观测、研究数据,从枝条、果序和单果三个水平对蒙古莸的结实格局特征进行统计分析。结果表明:受生境水分和养分条件的影响,人工种群植株结实率高于自然种群,种子千粒重和大小也均优于自然种群,枝条水平上,蒙古莸的结实率表现为枝条中部>基部>顶部;由于蒙古莸自身二歧聚伞花序的分化特点,使得同一果序中,果实的败育数量呈现出从两端向中间降低的选择性败育形式。单个果实内,败育种子发生的位置和数目不固定。

The seed setting pattern characteristics which was explained by branches, infructescence, single fruit of Caryopteris mongolica Bunge were analyzed based on the two years study data from natural and artificial populations. The results showed as follows ： influenced by water and nutrient conditions of the habitats, all of the seed produchion, size and thousand - seed weight of the artificial population were higher than those of the natural one. However, the seed production of different populations exhibited the same regulation on branches, it appeared as the middle 〉 base 〉 top. Due to the dichasium differentiation characteristics of C. mongolica, the percentage of abortive nutlets reduced from the edges to the intermediate part in a single infructescence, which manifested as the selective abortion. The numbers and positions of abortive seeds were uncertain.