Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China.
National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200032, China.
J Plant Res. 2021 Jul;134(4):797-802. doi: 10.1007/s10265-021-01286-4. Epub 2021 Mar 28.
In a typical cincinnus, the neighboring two flowers are generally enantiomorphic, which leads to the pendulum symmetry of the entire cyme. While in a two-flowered Cannaceae cincinnus, the flowers develop the same chirality. In this study, we observed several abnormal cincinni of Canna indica that extended longer than their normal form, which presented a second enantiomorphic flower, thus reflecting a typical pendulum symmetry. The chirality change of the second flower was strongly associated with the position of the lateral cincinnus meristem, which determines the angle size of the cincinnus zigzag shift and may serve as a key factor controlling the formation of pendulum symmetry. We propose that alternating floral chirality and the concomitant pendulum symmetry are the essential characteristics of a typical cincinnus. Accordingly, Canna flowers with the same chirality are arranged in modified cincinni.
在典型的聚伞花序中，相邻的两朵花通常是互为镜像的，这导致整个聚伞花序呈现出钟摆对称。然而，在双花型的姜科聚伞花序中，花朵会表现出相同的手性。在本研究中，我们观察到一些异常的姜荷花聚伞花序，它们比正常形态延伸得更长，呈现出第二朵互为镜像的花，从而反映出典型的钟摆对称。第二朵花的手性变化与侧聚伞花序分生组织的位置密切相关，该位置决定了聚伞花序曲折移动的角度大小，可能是控制钟摆对称形成的关键因素。我们提出，交替的花部手性和随之而来的钟摆对称是典型聚伞花序的基本特征。因此，具有相同手性的姜荷花花朵会以修饰后的聚伞花序排列。
