The fragmentation behavior of six known flavonoids from Meconopsis Maxim were studied by electrospray ionization tandem mass spectrometry (ESI-MS^n). Besides the structure of aglycones and hydroxyl group on it, the po...The fragmentation behavior of six known flavonoids from Meconopsis Maxim were studied by electrospray ionization tandem mass spectrometry (ESI-MS^n). Besides the structure of aglycones and hydroxyl group on it, the position of the sugar substitution also affected the fragmentation of the flavonoids. The diagnostic fragmentations of flavonoids and aglycones were obtained in the positive and negative ion ESI-MS^n experiments, and the fragmentation pathways were discussed.展开更多
中国西藏植物多样性较为丰富,尽管已经进行了多次的植物多样性调查,但仍存在较严重的不均衡现象,部分地区和类群存在采集不足,甚至空白。我们针对西藏日喀则植物多样性调查薄弱区域开展调查,发现一个未记录的绿绒蒿属(Meconopsis Vigui...中国西藏植物多样性较为丰富,尽管已经进行了多次的植物多样性调查,但仍存在较严重的不均衡现象,部分地区和类群存在采集不足,甚至空白。我们针对西藏日喀则植物多样性调查薄弱区域开展调查,发现一个未记录的绿绒蒿属(Meconopsis Viguier)植物,采集了标本和种子。经查阅《西藏植物志》《中国植物志》、Flora of China、Flora of Nepal鉴定为尼东绿绒蒿(M.dhwojii G.Taylor ex Hay)。该文植物新资料报道如下:(1)尼东绿绒蒿形态描述及其彩色图片。(2)该植物种子微形态、与近似种间的形态差异。新发现丰富了中国绿绒蒿属植物多样性,对研究西藏乃至中国绿绒蒿属植物具有一定的生物地理学意义和潜在的园艺价值。绿绒蒿属分类须加强野外调研,多技术手段开展研究。展开更多
总状绿绒蒿(Meconopsis racemosa Maxim.)为罂粟科绿绒蒿属一年生草本,高20~50 cm, 全体被黄褐色或淡黄色坚硬而平展的硬刺。茎圆柱形,不分枝。基生叶及下部茎生叶长圆状披针形、倒披针形或稀狭卵形、条形。总状花序有多达14朵花。萼片...总状绿绒蒿(Meconopsis racemosa Maxim.)为罂粟科绿绒蒿属一年生草本,高20~50 cm, 全体被黄褐色或淡黄色坚硬而平展的硬刺。茎圆柱形,不分枝。基生叶及下部茎生叶长圆状披针形、倒披针形或稀狭卵形、条形。总状花序有多达14朵花。萼片长圆状卵形,外面被刺毛,早落。花瓣5~8,倒卵状长圆形,天蓝色或蓝紫色,有时红色。蒴果倒卵形或椭圆状长圆形,密被刺毛。展开更多
文摘The fragmentation behavior of six known flavonoids from Meconopsis Maxim were studied by electrospray ionization tandem mass spectrometry (ESI-MS^n). Besides the structure of aglycones and hydroxyl group on it, the position of the sugar substitution also affected the fragmentation of the flavonoids. The diagnostic fragmentations of flavonoids and aglycones were obtained in the positive and negative ion ESI-MS^n experiments, and the fragmentation pathways were discussed.
文摘中国西藏植物多样性较为丰富,尽管已经进行了多次的植物多样性调查,但仍存在较严重的不均衡现象,部分地区和类群存在采集不足,甚至空白。我们针对西藏日喀则植物多样性调查薄弱区域开展调查,发现一个未记录的绿绒蒿属(Meconopsis Viguier)植物,采集了标本和种子。经查阅《西藏植物志》《中国植物志》、Flora of China、Flora of Nepal鉴定为尼东绿绒蒿(M.dhwojii G.Taylor ex Hay)。该文植物新资料报道如下:(1)尼东绿绒蒿形态描述及其彩色图片。(2)该植物种子微形态、与近似种间的形态差异。新发现丰富了中国绿绒蒿属植物多样性,对研究西藏乃至中国绿绒蒿属植物具有一定的生物地理学意义和潜在的园艺价值。绿绒蒿属分类须加强野外调研,多技术手段开展研究。
文摘总状绿绒蒿(Meconopsis racemosa Maxim.)为罂粟科绿绒蒿属一年生草本,高20~50 cm, 全体被黄褐色或淡黄色坚硬而平展的硬刺。茎圆柱形,不分枝。基生叶及下部茎生叶长圆状披针形、倒披针形或稀狭卵形、条形。总状花序有多达14朵花。萼片长圆状卵形,外面被刺毛,早落。花瓣5~8,倒卵状长圆形,天蓝色或蓝紫色,有时红色。蒴果倒卵形或椭圆状长圆形,密被刺毛。
