Details

Autor(en) / Beteiligte

• Yu, S. X
• Zhou, X.-R
• Xu, G.-F
• Meng, L
• Bi, H.-Y

Titel

Floral development in Impatiens chishuiensis (Balsaminaceae): formation of two well-developed anterolateral sepals and four carpels

Ist Teil von

• Plant systematics and evolution, 2010-05, Vol.286 (1-2), p.21-26

Ort / Verlag

Vienna: Vienna : Springer Vienna

Erscheinungsjahr

2010

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Impatiens is a highly diversified genus with remarkable zygomorphic flowers. Floral ontogeny of three species of Impatiens has recently been studied, which suggested that, during the course of evolution, the anterolateral sepals become reduced and that these rudimentary sepals fuse postgenitally or congenitally with the anterior petal. All three belong to the majority type with five carpels and no mature anterolateral sepals. However, a few species of Impatiens have four carpels and two well-developed mature anterolateral sepals, and their floral development has never been examined. From a comparative-ontogenetic viewpoint, we explore the mechanism of formation of well-developed anterolateral sepals and four carpels in I. chishuiensis with five sepals and four carpels. The results show that, if anterolateral sepals are present, their early development statuses will likely influence whether or not the sepals can fully develop later, and that the initiation and development of five stamens have an effect on the shapes of floral apexes, eventually resulting in congenital fusion of two adaxial carpels. Furthermore, we discuss the systematic and evolutional value of floral early development data.