Preliminary Studies on Hybridization among Sympatric Distributed Calligonum Species in Northern Xinjiang

doi:10.7525/j.issn.1673-5102.2016.05.022

Abstract

Abstract: Hybridization is one key issue in taxonomy of the genus Calligonum. To certificate whether or not hybridization are existing among sympatric distributed Calligonum species, observations of flowering phenology both in natural habitats and botanical garden, artificial pollination hybridization experiments and fluorescence microscope observation on cross-pollination of pollen tubes were carried on. Florescence among the sympatric species was overlapped. Fruit rate by artificial pollination was very low, and could not germinate. Pollen tube fluorescent experiments showed that hybrid pollen could germinate on the stigma, but the pollen tube could not stretch to the ovary. Above all, affinity of interspecific gametes was low, reproductive isolation was existing, and hybridization was absent. This study has important implications for understanding the isolation and differentiation of sympatric Calligonum species.

Key words: Calligonum L., flowering phenology, hybridization, fluorescence microscopy

CLC Number:

S793.1

KANG Xiao-Shan, Sophia, DUAN Shi-Min, PAN Bo-Rong, ZHANG Yong-Zhi, TIAN Cong. Preliminary Studies on Hybridization among Sympatric Distributed Calligonum Species in Northern Xinjiang[J]. Bulletin of Botanical Research, 2016, 36(5): 790-794.

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