Floral Organogenesis and Ring Meristem in &amp;lt;i&amp;gt;Phytolacca&amp;lt;/i&amp;gt;

Hongchun Zheng,Zhenghai Hu,Anming Lu

doi:10.4236/ajps.2015.63050

Abstract

To further study the floral organogenesis and discussing the floral origin of Phytolacca, the procedures of floral organogenesis were observed in Phytolacca esculenta and Phytolacca zhejiangensis. The results showed that the floral organogenesis was consistent in Phytolacca. Their sepals were 2/5 helix, and with counter-clockwise and clockwise, usually the first sepal located at non-median of abaxial side. The first sepal of Phytolacca esculenta was initiated at non-median of adaxial side. There was no evident relationship between sepal and stamen initiating position, and the stamens initiated on ring meristem, they initiated approximately at the same time, and when the androecium member was numerous, they initiated centrifugally, the outer stamen initiated irregularly. Carpel initiated alternately with inner stamens. And the carpels connected by septum, if the septum grew more, the carpel was syncarpous at morphology, otherwise the carpel was apocarpous at morphology. So the syncarpous and the apocarpous have no successively relationship on evolution. Ovule initiated inside the carpel and opposite to carpel. Androecium, carpel and ovule initiated at ring meristem.

Highlights

Phytolacca is the most original genus, is the biggest one in Phytolaccaceae, with ca. 25 species [1] or 35 species [2]
Inner rotational androecium initiated out-of-order and so do outer rotational in plants of genus Phytolacca, so it is different from other centrifugal initiation
The androecia of Phytolacca initiated on ring meristem, and because the ring meristem extended, the lower tissue of inner androecium could initiate androecium

Summary

Introduction

Phytolacca is the most original genus, is the biggest one in Phytolaccaceae, with ca. 25 species [1] or 35 species [2]. 25 species [1] or 35 species [2]. Phytolacca is the most original genus, is the biggest one in Phytolaccaceae, with ca. This genus have raceme, which is acrogenous on apex, and opposite with leaf in lower (This is caused by axillary bud strongly growth). (2015) Floral Organogenesis and Ring Meristem in Phytolacca. Stamens 6 to 33, line in one whorl or numerous whorls [3]. Carpel 5 to 16, line in one whorl, their base united each other, upper separated or whole united together besides style and stigma [3]-[5]

Methods

Results

Conclusion