Biodiversity Science ›› 2007, Vol. 15 ›› Issue (6): 658-665.doi: 10.1360/biodiv.070066

Special Issue: Studies on Plant–Pollinator Interaction

• Special Issue • Previous Article     Next Article

The potential roles of interspecific pollination in natural hybridization of Rhododendron species in Yunnan, China

Jingli Zhang1, 2, Changqin Zhang1*, Zhikun Wu1, 2, Qin Qiao1, 2   

  1. 1 Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204
    2 Graduate University of the Chinese Academy of Sciences, Beijing 100049
  • Online:2007-11-20

Natural hybridization mediated by pollen flow has been considered as an important factor to drive speciation in Rhododendron, one of the largest genera within alpine plants. The diversity of Rhododendron species is centered in southwestern China, yet the potential role of interspecific pollination in natural hybridization has not been empirically examined in this area. Here we investigated the flowering period and floral visitors, and conducted a series of pollination experiments to examine breeding systems and hybrid compatibility within four Rhododendron which are frequently sympatric in Yunnan Province. Rhododendron delavayi and R. decorum are clearly distinct by their morphological traits, but the putative hybrids R. agastum and R. irroratum are morphologically between the other two species. We observed that R. delavayi flowered from the beginning of March to the end of May, R. agastum and R. irroratum flowered from the beginning of March to the beginning of April, and after their flowering periods ended, R. decorum began to flower until the end of May. The anthesis of single flowers of the four Rhododendron species was almost one week. The floral visitors belong to the Hymenoptera and Diptera Orders, and Apis cerana cerana visited all of the four Rhododendron species. We found that R. delavayi, R. agastum and R. decorum are self-incompatible, but not R. irroratum. No breeding barrier between any of the four species was detected by artificial pollination, and the hybrid seeds were fertile. The hybrids between four species showed equivalent fitness to their par-ents. We suggest that the role of potential interspecific pollination is essential to hybrid speciation and evolu-tion of Rhododendron species.

No related articles found!
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] Yihao Shi, Jiaying Huang, Tianshu Sun, Xuefei Wang, Chenqi Zhu, Yuxi Ai and Hongya Gu. The precise regulation of different COR genes by individual CBF transcription factors in Arabidopsis thaliana[J]. J Integr Plant Biol, 2017, 59(2): 118 -133 .
[2] YANG Long-Long, WU Yan-Ru. Species diversity of bees in different habitats in Xishuangbanna tropical forest region[J]. Biodiv Sci, 1998, 06(3): 197 -204 .
[3] Chen Chia-Jui. Sphaerotylos C. J. Chen—A Remarkable New Genus of Urticaceae from China, with Notes on Stigmas of the Family[J]. J Syst Evol, 1985, 23(6): 444 -456 .
[4] XIE Lei, LI Liang-Qian, ZHANG Da-Ming. Assessment of Genetic Variation and Distribution Pattern of Thalictrum petaloideum Detected by RAPDs[J]. J Integr Plant Biol, 2004, 46(2): 165 -170 .
[5] ZHU Hui-Fen, YANG Jun-Bo, ZHANG Chang-Qing, LI De-Zhu. Systematic position of Primula secundiflora (Primulaceae) inferred from nuclear ribosomal DNA ITS sequence data[J]. J Syst Evol, 2002, 40(2): 133 -138 .
[6] Zhi-Cheng ZHU, Yin HUANG, Feng-Wei XU, Wen XING, Shu-Xia ZHENG, Yong-Fei BAI. Effects of precipitation intensity and temporal pattern on soil nitrogen mineralization in a typical steppe of Nei Mongol grassland[J]. Chin J Plan Ecolo, 2017, 41(9): 938 -952 .
[7] . [J]. Chin Bull Bot, 1994, 11(专辑): 76 .
[8] Zhang Jingwei. Mallee——A Special Vegetation Type in Australia[J]. Chin J Plan Ecolo, 1983, 7(3): 256 -259 .
[9] XU Jing-Xian WANG Yu-Fei YANG Jian PU Guang-Rong ZHANG Cui-Fen. Advances in the Research of Tertiary Flora and Climate in Yunnan[J]. Chin Bull Bot, 2000, 17(专辑): 84 -94 .
[10] Jiliang Xu, Xiaohui Zhang, Zhengwang Zhang, Guangmei Zheng, Xiangfeng Ruan, Keyin Zhang. Home range and habitat use of male Reeves’s pheasant (Syrmaticus reevesii) in winter in Dongzhai National Nature Reserve, Henan Province[J]. Biodiv Sci, 2005, 13(5): 416 -423 .