Divergence in flowering time is a major component contributing to reproductive isolation between two wild rice species (
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vergence in flowering time is a major component contributing to reproductive isolation between two wild rice species (Oryza rufipogon and O. nivara) 1,2
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Xun Xu , Qing-Lin Meng , Mu-Fan Geng , Ning-Ning Ren , Lian Zhou , Yu-Su Du , 1 1,2 1,2 1,2 1 1 Zhe Cai , Mei-Xia Wang , Xin Wang , Xiu-Hua Wang , Jing-Dan Han , Shuai Jiang , 1 1 3 3 1,2 Chun-Yan Jing , Rong Liu , Xiao-Ming Zheng , Qing-Wen Yang , Fu-Min Zhang & 1,2* Song Ge 1
State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany,Chinese Academy of Sciences, Beijing 100093, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China Received December 1, 2019; accepted March 12, 2020; published online April 20, 2020
It is of critical importance for our understanding of speciation process to determine the forms of reproductive isolation and their relative importance in species divergence. Oryza nivara and O. rufipogon are direct ancestors of Asian cultivated rice and a progenitor-daughter species pair. Investigating the reproductive isolation between them provides insights into plant speciation and helps understanding of the rice domestication. Here, we quantitatively measured the major components of reproductive isolation between the two species based on common garden and crossing experiments for three pairs of sympatric populations in Nepal, Cambodia and Laos.We revealed significant differences in the flowering times between species pairs, with O. nivara flowering much earlier than O. rufipogon. A very weak reduction in seed set but no reduction in F1 viability and fertility were detected for the crosses between species relative to those within species. Moreover, we detected asymmetrical compatibility between species and found that emasculation significantly decreased pollination success in O. nivara but not in O. rufipogon. Our study demonstrates that the divergence between O. nivara and O. rufipogon is maintained almost entirely by the difference in flowering times and suggests that differential flowering times contribute to both habitat preferences and reproductive isolation between species. reproductive isolation, flowering time, speciation, adaptation, Oryza species Citation:
Xu, X., Meng, Q.L., Geng, M.F., Ren, N.N., Zhou, L., Du, Y.S., Cai, Z., Wang, M.X., Wang, X., Wang, X.H. et al., (2020). Divergence in flowering time is a major component contributing to reproductive isolation between two wild rice species (Oryza rufipogon and O. nivara). Sci China Life Sci 63, https://doi.org/10.1007/s11427-019-1678-6
INTRODUCTION Reproductive isolation, which is the basis for the biological species concept (Mayr, 1942; Coyne and Orr, 2004), is considered the essential reason for biodiversity; thus, the *Corresponding author (email: [email protected])
evolution of reproductive isolation is a fundamental question in evolutionary biology given
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