Evolutionary history of two rare endemic conifer species from the eastern Qinghai-Tibet Plateau

MIAO, J.B., Perla FARHAT, W.T. WANG, M. RUHSAM, R. MILNE, H. YANG, S. TSO, J.L. LI, J.J. XU, L. OPGENOORTH, G. MIEHE a K.S. MAO. Evolutionary history of two rare endemic conifer species from the eastern Qinghai-Tibet Plateau. Annals of Botany. Oxford: Oxford University Press, 2021, roč. 128, č. 7, s. 903-918. ISSN 0305-7364. Dostupné z: https://dx.doi.org/10.1093/aob/mcab114.

Základní údaje

• Originální název: Evolutionary history of two rare endemic conifer species from the eastern Qinghai-Tibet Plateau
• Autoři: MIAO, J.B., Perla FARHAT (422 Libanon, garant, domácí), W.T. WANG, M. RUHSAM, R. MILNE, H. YANG, S. TSO, J.L. LI, J.J. XU, L. OPGENOORTH, G. MIEHE a K.S. MAO.
• Vydání: Annals of Botany, Oxford, Oxford University Press, 2021, 0305-7364.

Další údaje

• Originální jazyk: angličtina
• Typ výsledku: Článek v odborném periodiku
• Obor: 10611 Plant sciences, botany
• Stát vydavatele: Velká Británie a Severní Irsko
• Utajení: není předmětem státního či obchodního tajemství
• WWW: URL
• Impakt faktor: Impact factor: 5.040
• Kód RIV: RIV/00216224:14740/21:00124398
• Organizační jednotka: Středoevropský technologický institut
• Doi: http://dx.doi.org/10.1093/aob/mcab114
• UT WoS: 000743322200009
• Klíčová slova anglicky: Bottleneck event; conservation genomics; demographic history; effective population size; positively selected genes; habitat loss; Juniperus microsperma; Juniperus erectopatens; speciation history
• Štítky: rivok
• Příznaky: Mezinárodní význam, Recenzováno

Anotace

Background and Aims Understanding the population genetics and evolutionary history of endangered species is urgently needed in an era of accelerated biodiversity loss. This knowledge is most important for regions with high endemism that are ecologically vulnerable, such as the Qinghai-Tibet Plateau (QTP). Methods The genetic variation of 84 juniper trees from six populations of Juniperus microsperma and one population of Juniperus erectopatens, two narrow-endemic junipers from the QTP that are sister to each other, was surveyed using RNA-sequencing data. Coalescent-based analyses were used to test speciation. migration and demographic scenarios. Furthermore. positively selected and climate-associated genes were identified, and the genetic load was assessed for both species. Key Results Analyses of 149 052 single nucleotide polymorphisms showed that the two species arc well differentiated and monophyletic. They diverged around the late Pliocene. but interspecific gene flow continued until the Last Glacial Maximwn. Demographic reconstruction by Stairway Plot detected two severe bottlenecks for J. microsperma but only one for J. erectopaens. The identified positively selected genes and climate-associated genes revealed habitat adaptation of the two species. Furthermore, although J. microsperma had a much wider geographical distribution than J. erectopatens, the former possesses lower genetic diversity and a higher genetic load than the latter. Conclusions This study sheds light on the evolution of two endemic juniper species from the QTP and their responses to Quaternary climate fluctuations. Our findings emphasize the importance of speciation and demographic history reconstructions in understanding the current distribution pattern and genetic diversity of threatened species in mountainous regions.