2021年7月末至10月初,位于黄海沿岸的青岛市西海岸新区琅琊台湾贡口拦海坝处出现大量悬浮生长的大型红藻。为明确该类群的分类地位,探究其生物学特征,对该处红藻群体展开了实地调研,并采集相关样本开展了形态鉴定和分子系统发育分析。...2021年7月末至10月初,位于黄海沿岸的青岛市西海岸新区琅琊台湾贡口拦海坝处出现大量悬浮生长的大型红藻。为明确该类群的分类地位,探究其生物学特征,对该处红藻群体展开了实地调研,并采集相关样本开展了形态鉴定和分子系统发育分析。该群体主要由一种红藻组成,藻体紫红色、圆柱形,质软多肉,高度可达20cm,不规则互生分枝,分枝基部强烈缢缩、顶端尖细;藻体主轴横截面观可见较小的含色素外皮层细胞以及较大的近圆形假薄壁细胞和分布在髓层中央的散乱、疏松的丝状细胞。结合分子标记rbc L和cox I基因的系统发育分析结果,该物种被鉴定为细弱红翎菜(Solieria tenuis Zhang et Xia)。与历史研究记录不同,贡口拦海坝处的细弱红翎菜群体缺乏固着器和繁殖结构,悬浮性营养生长,所在海域丰富的氮磷营养可能为其快速生长提供了物质基础,在生长高峰期该群体总生物量约6 t (干重),是一次局部区域性小规模“藻华”。细弱红翎菜的悬浮生态型和暴发性增殖现象表明该物种可能具有较强的环境适应性,其生理特征和潜在的生态风险需进一步关注。展开更多
The dynamic change of total flavonoids content in above-ground part of Gynura bicolor (Willd. ) DC. and G. divaricata (L. ) DC. from two locations was researched. The result shows that the total flavonoids content in ...The dynamic change of total flavonoids content in above-ground part of Gynura bicolor (Willd. ) DC. and G. divaricata (L. ) DC. from two locations was researched. The result shows that the total flavonoids content in G. bicolor and G. divaricata leaf is lower in June and July,higher in the beginning and the middle of August and then has a certain decrease with a great fluctuation. Total flavonoids content in leaf of G. bicolor reaches the highest with a value of 12.031 mg·g-1 at the 15th August,and that in leaf of G. divaricata-1(from Zhejiang of China) and G. divaricata-2 (from South America) is the highest at the 1st August with a value of 17.381 and 19.935 mg·g-1,respectively. The total flavonoids content in leaf of G. bicolor and G. divaricata is higher than that in stem. Except leaf of G. divaricata-2,the total flavonoids content in stem and leaf appears decreasing trend from upper to lower part gradually. Therefore,taking total flavonoids content for an index,it is suitable to harvest upper leaf of G. bicolor,upper leaf and stem of G. divaricata-1,and whole leaf of G. divaricata-2 in August.展开更多
文摘2021年7月末至10月初,位于黄海沿岸的青岛市西海岸新区琅琊台湾贡口拦海坝处出现大量悬浮生长的大型红藻。为明确该类群的分类地位,探究其生物学特征,对该处红藻群体展开了实地调研,并采集相关样本开展了形态鉴定和分子系统发育分析。该群体主要由一种红藻组成,藻体紫红色、圆柱形,质软多肉,高度可达20cm,不规则互生分枝,分枝基部强烈缢缩、顶端尖细;藻体主轴横截面观可见较小的含色素外皮层细胞以及较大的近圆形假薄壁细胞和分布在髓层中央的散乱、疏松的丝状细胞。结合分子标记rbc L和cox I基因的系统发育分析结果,该物种被鉴定为细弱红翎菜(Solieria tenuis Zhang et Xia)。与历史研究记录不同,贡口拦海坝处的细弱红翎菜群体缺乏固着器和繁殖结构,悬浮性营养生长,所在海域丰富的氮磷营养可能为其快速生长提供了物质基础,在生长高峰期该群体总生物量约6 t (干重),是一次局部区域性小规模“藻华”。细弱红翎菜的悬浮生态型和暴发性增殖现象表明该物种可能具有较强的环境适应性,其生理特征和潜在的生态风险需进一步关注。
文摘The dynamic change of total flavonoids content in above-ground part of Gynura bicolor (Willd. ) DC. and G. divaricata (L. ) DC. from two locations was researched. The result shows that the total flavonoids content in G. bicolor and G. divaricata leaf is lower in June and July,higher in the beginning and the middle of August and then has a certain decrease with a great fluctuation. Total flavonoids content in leaf of G. bicolor reaches the highest with a value of 12.031 mg·g-1 at the 15th August,and that in leaf of G. divaricata-1(from Zhejiang of China) and G. divaricata-2 (from South America) is the highest at the 1st August with a value of 17.381 and 19.935 mg·g-1,respectively. The total flavonoids content in leaf of G. bicolor and G. divaricata is higher than that in stem. Except leaf of G. divaricata-2,the total flavonoids content in stem and leaf appears decreasing trend from upper to lower part gradually. Therefore,taking total flavonoids content for an index,it is suitable to harvest upper leaf of G. bicolor,upper leaf and stem of G. divaricata-1,and whole leaf of G. divaricata-2 in August.