Recent studies have suggested that reproductive interference, a deleterious interspecific interaction in the mating process, plays an important role in biological invasions. In the system of plant species, however, th...Recent studies have suggested that reproductive interference, a deleterious interspecific interaction in the mating process, plays an important role in biological invasions. In the system of plant species, however, the border with the pollen limitation has often been vague in past studies. This study, using field and laboratory experiments and field observations, examined the reproductive success of an endangered native herbaceous plant, Veronica polita lilacina, in the context of the reproductive interference by the alien congener, V. persica. The auto-pollination experiment confirmed that both species can usually produce seeds even without external conspecific pollens. Results of the artificial pollination experiment demonstrated that pollination with the heterospecific pollens significantly decreases the number of seeds in the native species, but not in the alien species. A transplant experiment revealed that the coexistence with the alien species reduced the fruiting success of the native species. Field observations have shown the interaction between two species in the native patch with only one intruding alien species. They demonstrated that native individuals placed closer to the alien individual suffered a greater decrease in fruiting success and the seed production and that the alien intruder produced no seed. These results demonstrate that species that could reproduce via the auto-pollination suffered the reproductive interference and that the native species also exert the resistive reproductive interference slightly. These interactions can explain the displacement pattern of the native species by the alien congener in Japan.展开更多
从两种密度的生境中随机采集阿拉伯婆婆纳(V eron ica p ersica)为测试材料,对其营养器官和生殖器官的有关指标(根干重、直立茎干重、匍匐茎干重、果实干重、直立茎长、匍匐茎长、匍匐茎数量、直立茎数量、果实数量等)进行测定,探讨该...从两种密度的生境中随机采集阿拉伯婆婆纳(V eron ica p ersica)为测试材料,对其营养器官和生殖器官的有关指标(根干重、直立茎干重、匍匐茎干重、果实干重、直立茎长、匍匐茎长、匍匐茎数量、直立茎数量、果实数量等)进行测定,探讨该植物在不同密度条件下营养生长对其有性繁殖的贡献。结果表明:不同密度条件下阿拉伯婆婆纳的营养生长对其有性繁殖产生不同程度的影响,果实干重和果实数与直立茎的资源配置比存在显著差异(P<0.05),高密度条件下只有部分营养器官的生长会显著影响其有性繁殖,而低密度条件下所有营养生长都会对其有性繁殖产生影响。展开更多
文摘Recent studies have suggested that reproductive interference, a deleterious interspecific interaction in the mating process, plays an important role in biological invasions. In the system of plant species, however, the border with the pollen limitation has often been vague in past studies. This study, using field and laboratory experiments and field observations, examined the reproductive success of an endangered native herbaceous plant, Veronica polita lilacina, in the context of the reproductive interference by the alien congener, V. persica. The auto-pollination experiment confirmed that both species can usually produce seeds even without external conspecific pollens. Results of the artificial pollination experiment demonstrated that pollination with the heterospecific pollens significantly decreases the number of seeds in the native species, but not in the alien species. A transplant experiment revealed that the coexistence with the alien species reduced the fruiting success of the native species. Field observations have shown the interaction between two species in the native patch with only one intruding alien species. They demonstrated that native individuals placed closer to the alien individual suffered a greater decrease in fruiting success and the seed production and that the alien intruder produced no seed. These results demonstrate that species that could reproduce via the auto-pollination suffered the reproductive interference and that the native species also exert the resistive reproductive interference slightly. These interactions can explain the displacement pattern of the native species by the alien congener in Japan.
文摘从两种密度的生境中随机采集阿拉伯婆婆纳(V eron ica p ersica)为测试材料,对其营养器官和生殖器官的有关指标(根干重、直立茎干重、匍匐茎干重、果实干重、直立茎长、匍匐茎长、匍匐茎数量、直立茎数量、果实数量等)进行测定,探讨该植物在不同密度条件下营养生长对其有性繁殖的贡献。结果表明:不同密度条件下阿拉伯婆婆纳的营养生长对其有性繁殖产生不同程度的影响,果实干重和果实数与直立茎的资源配置比存在显著差异(P<0.05),高密度条件下只有部分营养器官的生长会显著影响其有性繁殖,而低密度条件下所有营养生长都会对其有性繁殖产生影响。
