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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Secondary origin, hybridization and sexual reproduction in a diploid-tetraploid contact zone of the facultatively apomictic orchid Zygopetalum mackayi

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Moura, Y. A. [1] ; Alves-Pereira, A. [1] ; da Silva, C. C. [1] ; Souza, L. M. [1] ; de Souza, A. P. [1] ; Koehler, S. [1]
Total Authors: 6
[1] Univ Estadual Campinas UNICAMP, Inst Biol, Dept Biol Vegetal, CP 6109, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Plant Biology; v. 22, n. 5, p. 939-948, SEP 2020.
Web of Science Citations: 0

The production of triploids and apomictic reproduction are important processes for polyploid establishment and cytotype coexistence, but we know little about the interaction between triploids and facultatively apomictic plants. To bridge this gap, we studied the pollen-dependent, facultatively apomictic orchid Zygopetalum mackayi from high-elevation outcrops of southeast Brazil. We described the nature of the contact between Z. mackayi cytotypes and patterns of genetic diversity and structure based on eight microsatellite markers and 155 individuals of pure tetraploid, pure diploid and mixed cytotype populations. Our results revealed high values of genetic and genotypic diversity within all populations of Z. mackayi. Each cytotype emerged as a genetic distinct cluster, combining individuals from different populations. Triploids clustered in an intermediate position between diploids and tetraploids. Most genetic variance is associated with individuals within populations and genetic differentiation is high among populations. Mixed cytotype populations of Z. mackayi originate from secondary contact. Triploids are hybrids between diploids and tetraploids and likely act as a bridge. Our results point to the predominance of sexual reproduction in all populations but do not corroborate previous basic chromosome number for this species. Polyploidy rather than facultative apomixis may explain the larger geographic distribution of tetraploids of Z. mackayi. (AU)

FAPESP's process: 18/00036-9 - Genomic resources of manioc (Manihot esculenta) for the evolutionary study of cultivated varieties and in the search of important genes for breeding
Grantee:Alessandro Alves Pereira
Support Opportunities: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/04426-5 - Unraveling the role of apomixis in the diversification of the Zygopetalum maculatum orchid species complex
Grantee:Samantha Koehler
Support Opportunities: Regular Research Grants