Homoploid Hybridization between Native Salix cavaleriei and Exotic Salix matsudana (Salicaceae)

doi:10.7677/ynzwyj201514052

Abstract

Abstract:

Natural hybridization between Salix matsudana and Salix cavaleriei was investigated based on populations from Yunnan, China. Field observations revealed that the putative hybrid, S× heteromera had intermediate morpho
logies between Smatsudana and S. cavaleriei. This was further confirmed by principal component analysis. Sequence data of nuclear rDNA internal transcribed spacer region showed both intraspecific and intragenomic polymorphisms in all the three species, and S× heteromera showed a strong additive pattern between its suspected progenitors at all nucleotide sites of the genotypes identified. Therefore, S× heteromera was confirmed to be a natural hybrid between Scavaleriei and Smatsudana. Flow cytometry analysis indicated that all the three species are tetraploid, and the hybridization was homoploid. Sequence data from four chloroplast datasets indicated that the hybridization was asymmetric, with Scavaleriei as the maternal parent. The hybridization between the exotic common species Smatsudana and native rare species Scavaleriei might increase the risk of endangerment and even extinction, indicating that the introduction of Salix species should be made very cautiously.

Key words: Salix, Homoploid hybridization Asymmetry, Molecular evidence

CLC Number:

Q 943

WU Jie, WANG Dong-Chao, YANG Yong-Ping, CHEN Jia-Hui. Homoploid Hybridization between Native Salix cavaleriei and Exotic Salix matsudana (Salicaceae)[J]. Plant Diversity, 2015, 37(01): 1-10.

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