Testing the Hypothesis on Unidirectional Hybridization in Plants: Observations on Sonneratia, Bruguiera and Ligularia

Renchao Zhou; Suhua Shi; David Boufford; ChungI Wu; Shi Suhua

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Testing the Hypothesis on Unidirectional Hybridization in Plants: Observations on Sonneratia, Bruguiera and Ligularia

Renchao Zhou 1,Suhua Shi 1 * #,David Boufford 2,ChungI Wu 3,Shi Suhua 4

1.State Key Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, Sun Yat-Sen University, Guangzhou 510275, China

2.Harvard University Herbaria, 22 Divinity Ave, Cambridge, Massachusetts

3.Department of Ecology and Evolution, University of Chicago, Chicago

4.State Key Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, Sun Yat-Sen University

*Correspondence author

#Submitted by

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Funding: 国家自然科学基金,国家自然科学基金,国家自然科学基金（No.,,）

Opened online:19 March 2007

Accepted by: none

Citation: Renchao Zhou,Suhua Shi,David Boufford.Testing the Hypothesis on Unidirectional Hybridization in Plants: Observations on Sonneratia, Bruguiera and Ligularia [OL]. [19 March 2007] http://en.paper.edu.cn/en_releasepaper/content/11515

When natural hybridization occurred at sites where the hybridizing species differ in abundance, the pollen load delivered to the rare species would consist predominantly of that from the common species. Previous authors have therefore proposed a hypothesis on the direction of hybridization: Interspecific hybrids are more likely to have the female parent from the rare species and the male parent from the common species. By examining the maternally inherited chloroplast DNA of six interspecific F1 hybrids from four genera of plants, we observed highly asymmetric hybridizations that appear to be inconsistent with the current hypothesis. Our results show that relative abundance of the hybridizing species is not a good predictor of the direction of hybridization. These unexpected observations may result from other mechanisms operating in the hybrid zones of plants.

Keywords:Bruguiera; chloroplast DNA; direction of hybridization; Ligularia; natural hybridization; Sonneratia

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