J Syst Evol ›› 2014, Vol. 52 ›› Issue (4): 477-486.doi: 10.1111/jse.12079

• Research Articles • Previous Articles     Next Articles

New insights into the hybrid origin of Malus toringoides and its close relatives based on a single-copy nuclear gene SbeI and three chloroplast fragments

1,2Liang TANG 1,2Ju LI 1,2Si TAN 1,2Ming-Xia LI 1,2Xiang MA 1,2Zhi-Qin ZHOU*   

  1. 1(Key Laboratory of Horticulture Science for Southern Mountain Regions, Ministry of Education, Chongqing, China)
    2(College of Horticulture and Landscape Architecture, Southwest University, Chongqing, China)
  • Received:2013-07-17 Online:2014-01-26 Published:2014-03-20

Abstract: Malus toringoides Hughes and its close relatives, M. maerkangensis M. H. Cheng et al., M. setok Vassilcz., and M. xiaojinensis M. H. Cheng & N. G. Jiang were supposed to derive from hybridizations. However, molecular data are still inadequate to corroborate the hybrid origin hypotheses. In this study, we sequenced a single-copy nuclear gene SbeI and three chloroplast fragments and carried out phylogenetic analyses to investigate the evolutionary origins of the above four putative hybrid taxa. The hybrid nature of M. toringoides is confirmed by the detection of two distinct types of SbeI sequences from it. The chloroplast and SbeI gene phylogenies show that the maternal progenitor of M. toringoides is closely related to M. sikkimensis N. P. Balakr. and M. spectabilis Borkh., and the paternal progenitor is most likely M. transitoria C. K. Schneid. The hypothesis that M. kansuensis (Batalin) C. K. Schneid. is one of the parents of M. toringoides is not supported. Malus maerkangensis and M. xiaojinensis might have originated through hybridization between M. toringoides and M. kansuensis, whereas M. setok is genetically closely related to M. toringoides. The three close relatives of M. toringoides were designated as three novel species by some researchers, however, as they were all apomictic with limited distribution areas and they originated from hybridization and polyploidization, we recommend that their species status should be re-evaluated.

Key words: close relatives, hybrid origin, hybridization, Malus toringoides, single-copy nuclear gene.

[1] Bin-Bin Liu, De-Yuan Hong, Shi-Liang Zhou, Chao Xu, Wen-Pan Dong, Gabriel Johnson, and Jun Wen. Phylogenomic analyses of the Photinia complex support the recognition of a new genus Phippsiomeles and the resurrection of a redefined Stranvaesia in Maleae (Rosaceae) . J Syst Evol, 2019, 57(6): 678-694.
[2] Víctor Lucía, M. Montserrat Martínez-Ortega, Enrique Rico, and Kesara Anamthawat-Jónsson. Discovery of the genus Pseudoroegneria (Triticeae, Poaceae) in the Western Mediterranean on exploring the generic boundaries of Elymus . J Syst Evol, 2019, 57(1): 23-41.
[3] Zhi-Yao Ma, Jun Wen, Jing-Pu Tian, Abbas Jamal, Long-Qing Chen, Xiu-Qun Liu. Testing reticulate evolution of four Vitis species from East Asia using restriction‐site associated DNA sequencing . J Syst Evol, 2018, 56(4): 331-339.
[4] Richard J. Abbott. Plant speciation across environmental gradients and the occurrence and nature of hybrid zones . J Syst Evol, 2017, 55(4): 238-258.
[5] Jian-Li Zhao, Jinshun Zhong, Yong-Li Fan, Yong-Mei Xia, Qing-Jun Li. A preliminary species-level phylogeny of the alpine ginger Roscoea: Implications for speciation . J Syst Evol, 2017, 55(3): 215-224.
[6] Daniel J. Crawford,Jenny K. Archibald. Island floras as model systems for studies of plant speciation: Prospects and challenges . J Syst Evol, 2017, 55(1): 1-15.
[7] Yi-Xuan Kou, Kun Xiao, Xiao-Rong Lai, Yu-Jin Wang, Zhi-Yong Zhang. Natural hybridization between Torreya jackii and T. grandis (Taxaceae) in southeast China . J Syst Evol, 2017, 55(1): 25-33.
[8] Pan-Pan Wu, Hong-Wei Zuo, Genlou Sun, De-Xiang Wu, Bjorn Salomon, Qun-Wen Hu, Zhao-Rong Dong. Comparison of gene flow among species that occur within the same geographic locations versus gene flow among populations within species reveals introgression among several Elymus species . J Syst Evol, 2016, 54(2): 152-161.
[9] Zhe-Chen Qi, Yi Yu, Xiang Liu, Andrew Pais, Thomas Ranney, Ross Whetten, Qiu-Yun (Jenny) Xiang. Phylogenomics of polyploid Fothergilla (Hamamelidaceae) by RAD-tag based GBS—insights into species origin and effects of software pipelines . J Syst Evol, 2015, 53(5): 432-447.
[10] Chao YANG, Zhe WANG, Xiao YANG, Bao-Rong LU. Segregation distortion affected by transgenes in early generations of rice crop-weed hybrid progeny: Implications for assessing potential evolutionary impacts from transgene flow into wild relatives . J Syst Evol, 2014, 52(4): 466-476.
[11] Yong-Peng MA, Xiao-Ling TIAN, Jing-Li ZHANG, Zhi-Kun WU, Wei-Bang SUN. Evidence for natural hybridization between Primula beesiana and P. bulleyana, two heterostylous primroses in NW Yunnan, China . J Syst Evol, 2014, 52(4): 500-507.
[12] Ran WEI, Xian-Chun ZHANG. Rediscovery of Cystoathyrium chinense Ching (Cystopteridaceae): phylogenetic placement of the critically endangered fern species endemic to China . J Syst Evol, 2014, 52(4): 450-457.
[13] Da-Yong ZHANG. Demographic model of admixture predicts symmetric introgression when a species expands into the range of another: A comment on Currat et al. (2008) . J Syst Evol, 2014, 52(1): 35-39.
[14] Li-Jun YAN, Lian-Ming GAO, De-Zhu LI. Molecular evidence for natural hybridization between Rhododendron spiciferum and R. spinuliferum (Ericaceae) . J Syst Evol, 2013, 51(4): 426-434.
[15] Bao-Rong LU. Introgression of transgenic crop alleles: its evolutionary impacts on conserving genetic diversity of crop wild relatives . J Syst Evol, 2013, 51(3): 245-262.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!