植物分类学报

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驴蹄草属和金莲花属(毛茛科)花器官的形态发生及系统学意义

宋萍; 田先华*; 任毅   

  1. (陕西师范大学生命科学学院, 教育部药用植物资源与天然药物化学重点实验室 西安 710062)
  • 收稿日期:2006-10-23 修回日期:2006-12-25 出版日期:2007-11-18 发布日期:2007-11-18
  • 通讯作者: 田先华 E-mail:tianxianhua@snnu.edu.cnl

Floral morphogenesis of Caltha and Trollius (Ranunculaceae) and its systematic significance

SONG Ping, TIAN Xian-Hua*, REN Yi   

  1. (College of Life Sciences, Key Laboratory of Medicinal Plant Resource and Natural Pharmaceutical Chemistry of Ministry of Education, Shaanxi Normal University, Xi’an 710062, China)
  • Received:2006-10-23 Revised:2006-12-25 Online:2007-11-18 Published:2007-11-18
  • Contact: TIAN Xian-Hua< E-mail:tianxianhua@snnu.edu.cnl

Abstract: The floral morphogenesis of Caltha palustris L. and Trollius buddae Schipcz. was observed with a scanning electron microscope (SEM). The primordia of all floral organs initiate spirally and centripetally and develop centripetally. The spiral initiation sequence may be a basic pattern in Ranunculaceae. The primordia of bracts, sepals, and other floral organs are different in shape: the bract primordia are triangle, the sepal primordia crescent, and the petal (in Trollius), stamen, and carpel primordia hemispheric. This may indicate that the bracts, the sepals and other floral organs are different in origin. The petals are retarded in early developmental stages in Trollius buddae Schipcz, and have purses at the base. The retarded petals are very common in Ranunculaceae and the purse of the petal is similar to that of some Aquilegia species. The microspores in a longitudinal series of stamens develop centripetally in Caltha and Trollius; this may be a basic pattern in Ranunculaceae. The carpel primordia are plicate. In the developmental process of the carpels, the stigmatic tissue appears from the apex of the style and is decurrent along the ventral suture in Caltha, but there is no obvious stigmatic tissue in Trollius. Based on floral morphogenesis characteristics as well as the results from molecular systematics, comparative morphology and palynology studies, we consider that Caltha is not closely related to Trollius and that these two genera should not be treated in the same tribe.

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