Homoploid Hybrid Speciation Produces Surprising Innovative Traits

doi:10.11983/CBB25139

Abstract

Abstract: Recent research has discovered that an ancient homoploid interspecific hybridization event between ancestral species of the tomato lineage (Solanum sect. Lycopersicon) and sect. Etuberosum lineage in the nightshade family (Solanaceae) gave rise to the ancestral species of the potato lineage (sect. Petota) and generated the innovative "potato" tuber trait. This hybridization event not only introduced this key innovative trait but also triggered the exploitation of new ecological niches, ultimately leading to the explosive emergence of species within the potato clade. This study, together with related case studies in recent years, collectively reveals the universality of the molecular mechanism of homoploid hybrid speciation—namely, "generating innovative traits through the alternate inheritance of highly diverged alleles from both parental lineages". These findings hold significant implications for revising the traditional bifurcating speciation model and advancing the paradigm shift in artificial breeding practices.

Key words: Petota, Lycopersicon (tomato), homoploid hybrid speciation, alternate inheritance, highly diverged alleles, innovative trait, universality

Wen Wang. Homoploid Hybrid Speciation Produces Surprising Innovative Traits[J]. Chinese Bulletin of Botany, 2025, 60(6): 859-862.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB25139

https://www.chinbullbotany.com/EN/Y2025/V60/I6/859

Figures/Tables 1

References 14

[1]	Abbott R, Albach D, Ansell S, Arntzen JW, Baird SJE, Bierne N, Boughman J, Brelsford A, Buerkle CA, Buggs R, Butlin RK, Dieckmann U, Eroukhmanoff F, Grill A, Cahan SH, Hermansen JS, Hewitt G, Hudson AG, Jiggins C, Jones J, Keller B, Marczewski T, Mallet J, Martinez-rodriguez P, Möst M, Mullen S, Nichols R, Nolte AW, Parisod C, Pfennig K, Rice AM, Ritchie MG, Seifert B, Smadja MC, Stelkens R, Szymura JM, Väinölä R, Wolf JBW, Zinner D (2013). Hybridization and speciation. J Evol Biol 26, 229-246. DOI URL
[2]	Coyne JA, Orr HA (2004). Speciation. Sunderland: Sinauer Associates, Inc.
[3]	Grant V (1981). Plant Speciation. New York: Columbia University Press.
[4]	Lamichhaney S, Han F, Webster MT, Andersson L, Grant BR, Grant PR (2018). Rapid hybrid speciation in Darwin’s finches. Science 359, 224-228. DOI PMID
[5]	Long ZQ, Rieseberg LH (2025). Documenting homoploid hybrid speciation. Mol Ecol https://doi.org/10.1111/mec.17412.
[6]	Rosser N, Seixas F, Queste LM, Cama B, Mori-Pezo R, Kryvokhyzha D, Nelson M, Waite-Hudson R, Gorine M, Costa M, Elias M, Eleres de Figueiredo CM, Lucci Freitas AV, Joron M, Kozak K, Lamas G, Martins AR, McMillan WO, Ready J, Rueda-Muñoz N, Sakazar C, Salazar P, Schulz S, Shirai LT, Silva-Brandão KL, Mallet J, Dasmahapatra KK(2024). Hybrid speciation driven by multilocus introgression of ecological traits. Nature 628, 811-817. DOI
[7]	Wang J, Mao XX, Liu B, Wang ZF, Ma YZ, Li Q, Liu JQ (2025). Recurrent hybridizations during diversification of one Rhododendron species complex. Mol Ecol https://doi.org/10.1111/mec.70046.
[8]	Wang ZF, Jiang YZ, Bi H, Lu ZQ, Ma YZ, Yang XY, Chen NN, Tian B, Liu BB, Mao XX, Ma T, DiFazio SP, Hu QJ, Abbott RJ, Liu JQ (2021). Hybrid speciation via inheritance of alternate alleles of parental isolating genes. Mol Plant 14, 208-222. DOI PMID
[9]	Wang ZF, Kang MH, Li JL, Zhang ZY, Wang YF, Chen CL, Yang YZ, Liu JQ (2022). Genomic evidence for homoploid hybrid speciation between ancestors of two different genera. Nat Commun 13, 1987. DOI PMID
[10]	Wang ZF, Liu JQ (2025). Speciation studies in the genomic era. Hereditas 47, 71-100. (in Chinese)
	王则夫, 刘建全 (2025). 基因组时代的物种形成研究. 遗传 47, 71-100.
[11]	Wu H, Wang ZF, Zhang YX, Frantz L, Roos C, Irwin DM, Zhang CL, Liu XF, Wu DD, Huang S, Gu TT, Liu JQ, Yu L (2023). Hybrid origin of a primate, the gray snub-nosed monkey. Science 380, eabl4997.
[12]	Zhang BL, Chen W, Wang ZF, Pang W, Luo MT, Wang S, Shao Y, He WQ, Zhou L, Chen JW, Yang MM, Wu YJ, Wang L, Bellon HF, Molly S, Meunier H, Wanert F, Kuderna L, Marques-Bonet T, Roos C, Qi G, Li M, Liu ZJ, Schierup MH, Cooper N, Liu JQ, Zheng YT, Zhang GJ, Wu DD (2023). Comparative genomics reveals the hybrid origin of a macaque group. Sci Adv 9, eadd3580.
[13]	Zhang ZY, Zhang PX, Ding YY, Wang ZF, Ma ZX, Gagnon E, Jia YX, Cheng L, Bao ZG, Liu ZN, Wu YY, Hu Y, Lian Q, Lin WC, Wang N, Ye KY, Wang HR, Zhang JZ, Zhou YF, Liu L, Li SH, Lucas WJ, Sarkinen T, Knapp S, Rieseberg LH, Liu JQ, Huang SW (2025). Ancient hybridization underlies tuberization and radiation of the potato lineage. Cell 18, 5249-5265.
[14]	Zou TT, Kuang WM, Yin YY, Frantz L, Zhang C, Liu JQ, Wu H, Yu L (2022). Uncovering the enigmatic evolution of bears in greater depth: the hybrid origin of the Asiatic black bear. Proc Natl Acad Sci USA 119, e2120307119.