GENETIC STRUCTURE AND HYBRIDIZATION INTROGRESSION IN NATURAL POPULATIONS OF TWO CLOSELY RELATED ACTINIDIA SPECIES, A. CHINENSIS AND A. DELICIOSA

doi:10.3773/j.issn.1005-264x.2008.03.021

Abstract

Abstract:

Aims Gene introgression usually results from spontaneous hybridization in sympatric populations and has great impact on population genetic structure. Actinidia chinensis and A. deliciosa are two closely related species with different morphologies and polyploidy levels. Our objective was to analyze their genetic diversity, population genetic structure and hybridization introgression to clarify their evolutionary history and provide baseline data for conservation and management strategies.

Methods We investigated five sympatric complex populations and two allopatric populations of A. chinensis and A. deliciosa using nine pairs of SSR primers and analyzed genetic diversity and differentiation indexes within and between species.

Important findings We detected 196 alleles at the nine polymorphic loci among 432 individuals sampled from the seven locations. The percentage of alleles shared in the two species was 81.13%, and the percentage of species-specific alleles for A. chinensis and A. deliciosa was 13.27% and 5.61%, respectively. Intra-specific genetic diversity in both species was high. Nei's genetic differentiation among populations within or between species was low, indicating high gene flow among populations and between the two species. The UPGMA dendrogram clustered the sympatric complex populations. Individuals also were clustered into their own populations, whereas no correlation was found between population clustering and geographic distance. We discuss the combined impacts of wide-range distribution, outcrossing, late differentiation and other life history characteristics, as well as genome size of the genus, complex ploidy level and interspecific hybridization on the genetic variation and population structure of these two sympatric species. We concluded that the shared ancestral genetic polymorphisms and recent hybridization introgression between species in sympatric complex populations likely played a key role in formulating population structure of Actinidia species.

Key words: Actinidia, genetic diversity, genetic differentiation, introgression, microsatellite

LIU Ya-Ling, LI Zuo-Zhou, JIANG Zheng-Wang, LIU Yi-Fei, HUANG Hong-Wen. GENETIC STRUCTURE AND HYBRIDIZATION INTROGRESSION IN NATURAL POPULATIONS OF TWO CLOSELY RELATED ACTINIDIA SPECIES, A. CHINENSIS AND A. DELICIOSA[J]. Chin J Plant Ecol, 2008, 32(3): 704-718.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2008.03.021

https://www.plant-ecology.com/EN/Y2008/V32/I3/704

Figures/Tables 10

References 72

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位点 Loci	等位基因数 No. of alleles	共有等位基因比率 Percentage of common alleles (%)	共有等位基因数 Common alleles in both species	特有等位基因数 Species specific alleles
位点 Loci	等位基因数 No. of alleles	共有等位基因比率 Percentage of common alleles (%)	共有等位基因数 Common alleles in both species	中华猕猴桃 Actinidia chinensis	美味猕猴桃 A. deliciosa
UDK96-001	36	86.1	31	3	2
UDK96-009	21	66.7	14	5	2
UDK96-013	17	58.8	10	6	1
UDK96-019	27	92.6	25	1	1
UDK96-028	17	64.7	11	5	1
UDK96-039	18	83.3	15	0	3
UDK97-404	19	89.5	17	1	1
UDK97-408	21	90.5	19	2	0
UDK97-420	20	85.0	17	3	0
共计Total	196	81.1	159	26	11
平均Mean	21.78	79.7	17.67	2.89	1.22

位点 Loci	等位基因数 No. of alleles	共有等位基因比率 Percentage of common alleles (%)	共有等位基因数 Common alleles in both species	特有等位基因数 Species specific alleles
位点 Loci	等位基因数 No. of alleles	共有等位基因比率 Percentage of common alleles (%)	共有等位基因数 Common alleles in both species	中华猕猴桃 Actinidia chinensis	美味猕猴桃 A. deliciosa
UDK96-001	36	86.1	31	3	2
UDK96-009	21	66.7	14	5	2
UDK96-013	17	58.8	10	6	1
UDK96-019	27	92.6	25	1	1
UDK96-028	17	64.7	11	5	1
UDK96-039	18	83.3	15	0	3
UDK97-404	19	89.5	17	1	1
UDK97-408	21	90.5	19	2	0
UDK97-420	20	85.0	17	3	0
共计Total	196	81.1	159	26	11
平均Mean	21.78	79.7	17.67	2.89	1.22

居群 Population	中华猕猴桃Actinidia chinensis		美味猕猴桃A. deliciosa
居群 Population	N	A	P	H_o	PIC		N	A	P	H_o	PIC
湖北五峰Wufeng Hubei (HW)	20	12.11	100	0.922	0.834	31	12.78	100	0.703	0.832
广西资源Ziyuan Guangxi (GZ)	36	11.56	100	0.423	0.757	11	7.33	100	0.545	0.790
河南西峡Xixia Henan (HX)	52	14.44	100	0.891	0.865	39	13.33	100	0.826	0.841
陕西商南Shangnan Shaanxi (SS)	47	12.22	100	0.768	0.758	49	13.33	100	0.802	0.820
湖南绥宁Suining Hunan (HS)	35	12.89	100	0.724	0.823	35	12.89	100	0.781	0.781
广西龙胜Longsheng Guangxi (GL)	20	6.67	100	0.389	0.765
湖北利川Lichuan Hubei (HL)						57	15.11	100	0.836	0.846
居群平均Mean at population level	35	11.65	100	0.686	0.800	37	12.46	100	0.749	0.818
标准误差 Standard error		2.40		0.209	0.042		2.42		0.101	0.025
物种水平At species level	210	20.56	100	0.711	0.874	222	18.89	100	0.782	0.889

居群 Population	中华猕猴桃Actinidia chinensis		美味猕猴桃A. deliciosa
居群 Population	N	A	P	H_o	PIC		N	A	P	H_o	PIC
湖北五峰Wufeng Hubei (HW)	20	12.11	100	0.922	0.834	31	12.78	100	0.703	0.832
广西资源Ziyuan Guangxi (GZ)	36	11.56	100	0.423	0.757	11	7.33	100	0.545	0.790
河南西峡Xixia Henan (HX)	52	14.44	100	0.891	0.865	39	13.33	100	0.826	0.841
陕西商南Shangnan Shaanxi (SS)	47	12.22	100	0.768	0.758	49	13.33	100	0.802	0.820
湖南绥宁Suining Hunan (HS)	35	12.89	100	0.724	0.823	35	12.89	100	0.781	0.781
广西龙胜Longsheng Guangxi (GL)	20	6.67	100	0.389	0.765
湖北利川Lichuan Hubei (HL)						57	15.11	100	0.836	0.846
居群平均Mean at population level	35	11.65	100	0.686	0.800	37	12.46	100	0.749	0.818
标准误差 Standard error		2.40		0.209	0.042		2.42		0.101	0.025
物种水平At species level	210	20.56	100	0.711	0.874	222	18.89	100	0.782	0.889

位点 Loci	中华猕猴桃Actinidia chinensis		美味猕猴桃A. deliciosa
位点 Loci	H_T	H_S	D_ST	G_ST	N_m		H_T	H_S	D_ST	G_ST	N_m
UDK96-001	0.940	0.887	0.053	0.056	4.184	0.956	0.905	0.051	0.053	4.436
UDK96-009	0.857	0.721	0.136	0.159	1.325	0.962	0.701	0.261	0.271	0.671
UDK96-013	0.879	0.788	0.091	0.104	2.165	0.879	0.794	0.085	0.097	2.354
UDK96-019	0.944	0.908	0.036	0.038	6.306	0.929	0.906	0.023	0.025	9.848
UDK96-028	0.700	0.542	0.158	0.226	0.858	0.698	0.597	0.101	0.145	1.478
UDK96-039	0.841	0.768	0.073	0.087	2.630	0.870	0.830	0.040	0.046	5.188
UDK97-404	0.898	0.858	0.040	0.045	5.363	0.893	0.879	0.014	0.016	15.696
UDK97-408	0.895	0.845	0.050	0.056	4.225	0.895	0.869	0.026	0.029	8.356
UDK97-420	0.910	0.871	0.039	0.043	5.583	0.916	0.882	0.034	0.037	6.485
平均Mean (标准误差SE)	0.874 (0.066)	0.799 (0.102)	0.075 (0.040)	0.086	2.663	0.889 (0.070)	0.818 (0.094)	0.071 (0.069)	0.080	2.880