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Int. J. Mol. Sci. 2018, 19(9), 2595; https://doi.org/10.3390/ijms19092595

Morphological Type Identification of Self-Incompatibility in Dendrobium and Its Phylogenetic Evolution Pattern

1
Shenzhen Key Laboratory for Orchid Conservation and Utilization, The National Orchid Conservation Center of China and The Orchid Conservation and Research Center of Shenzhen, Shenzhen 518114, China
2
State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
4
College of Forestry and Landscape Architecture, Center of Experimental Teaching for Common Basic Courses, South China Agricultural University, Guangzhou 510640, China
5
Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing 100093, China
6
College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510640, China
7
College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
8
The Center for Biotechnology and BioMedicine, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 28 April 2018 / Revised: 29 August 2018 / Accepted: 29 August 2018 / Published: 1 September 2018
(This article belongs to the Special Issue Pollen Tube and Plant Reproduction)
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Abstract

Self-incompatibility (SI) is a type of reproductive barrier within plant species and is one of the mechanisms for the formation and maintenance of the high diversity and adaptation of angiosperm species. Approximately 40% of flowering plants are SI species, while only 10% of orchid species are self-incompatible. Intriguingly, as one of the largest genera in Orchidaceae, 72% of Dendrobium species are self-incompatible, accounting for nearly half of the reported SI species in orchids, suggesting that SI contributes to the high diversity of orchid species. However, few studies investigating SI in Dendrobium have been published. This study aimed to address the following questions: (1) How many SI phenotypes are in Dendrobium, and what are they? (2) What is their distribution pattern in the Dendrobium phylogenetic tree? We investigated the flowering time, the capsule set rate, and the pollen tube growth from the representative species of Dendrobium after artificial pollination and analysed their distribution in the Asian Dendrobium clade phylogenetic tree. The number of SI phenotypes exceeded our expectations. The SI type of Dendrobium chrysanthum was the primary type in the Dendrobium SI species. We speculate that there are many different SI determinants in Dendrobium that have evolved recently and might be specific to Dendrobium or Orchidaceae. Overall, this work provides new insights and a comprehensive understanding of Dendrobium SI. View Full-Text
Keywords: Dendrobium; self-incompatibility; pollen tube; capsule set; ancestral status Dendrobium; self-incompatibility; pollen tube; capsule set; ancestral status
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Niu, S.-C.; Huang, J.; Xu, Q.; Li, P.-X.; Yang, H.-J.; Zhang, Y.-Q.; Zhang, G.-Q.; Chen, L.-J.; Niu, Y.-X.; Luo, Y.-B.; Liu, Z.-J. Morphological Type Identification of Self-Incompatibility in Dendrobium and Its Phylogenetic Evolution Pattern. Int. J. Mol. Sci. 2018, 19, 2595.

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