Floral organogenesis and development of two taxa in tribe Hyoscyameae (Solanaceae): Przewalskia tangutica and Hyoscyamus niger
Floral organogenesis and development of two taxa in tribe Hyoscyameae (Solanaceae): Przewalskia tangutica and Hyoscyamus niger
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发表时间：
2002-08
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通讯作者：
Yang Dong-zhi;Zhang Zhi-yun;Lu An-ming;S. Kun;Li Jian-quan
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作者：
Yang Dong-zhi;Zhang Zhi-yun;Lu An-ming;S. Kun;Li Jian-quan
利用扫描电镜对中国特有的Przeivalskia langutica Maxim和茄科天仙子(Hyoscyamus niger L.)的花器官发生和发育进行了研究。它们的花器官发生和发育具有三个共同特征：1）两个物种花器官的发生遵循霍夫迈斯特规则； 2）花冠筒发育方式属于“晚合瓣”型； 3) 花附属物的原基以五角形图案和顶端顺序开始。但这两个物种的萼叶原基的起始表现出不同的模式。 H, niger的萼裂原基是同时轮生的，而P, tangulica的萼裂原基是螺旋状的，但五个萼裂原基全部出现后，五个萼裂原基形成一个环。本文讨论了天仙子属和 Przeivalskia 属中目前结果的系统意义。
Floral organogenesis and development of Przeivalskia langutica Maxim, endemic to China and Hyoscyamus niger L. , which belong to the tribe Hyoscyameae (Solanaceae), were studied using scanning electron microscope. They have three common characters of floral organ initiation and development: 1) initia-tion of the floral organs in the two species follows Hofmeister's rule; 2) the mode of corolla tube development belongs to the "late sympetaly" type; 3) primordia of the floral appendages initiated in a pentameroua pattern and acropetal order. But initiation of the calyx-lobe primordia showed different modes in these two species. The calyx-lobe primordia of H, niger have simultaneously whorled initiation, while those of P, tangulica have helical initiation, but the five calyx-lobe primordia form a ring after all five calyx-lobe primordia occur. The systematic significance of the present results in the genera Hyoscyamus and Przeivalskia is discussed in this paper.