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Origins and introgression of polyploid species in Mentzelia section Trachyphytum (Loasaceae).

Abstract：

UNLABELLED: PREMISE OF THE STUDY:Polyploid speciation has been important in plant evolution. However, the conditions that favor the origination and persistence of polyploids are still not well understood. Here, we examine origins of 16 polyploid species in Mentzelia section Trachyphytum. • METHODS:We used phylogeny reconstructions based on DNA sequences from plastid regions and the nuclear gene isocitrate dehydrogenase (idh) to construct hypotheses of introgression and polyploidization. • KEY RESULTS:Molecular data suggest that homoploid hybridization has been surprisingly common in Trachyphytum. Diploid species had unequal involvement in polyploid origins, but most polyploid taxa had allopolyploid origins from extant progenitors. A few polyploids with extreme phenotypes did not appear to have extant progenitors. We infer that the progenitors of these species were derived from extinct diploid lineages or ancestral lineages of multiple extant diploids. In agreement with other recent studies, we recovered molecular evidence of multiple phylogenetically distinct origins for several polyploid taxa, including the widespread octoploid M. albicaulis. • CONCLUSIONS:Evidence of high levels of introgression and allopolyploidy suggests that hybridization has played an important role in the evolution of Trachyphytum. Although idh sequences exhibited complicated evolution, including gene duplication, deletion, and recombination, they provided a higher percentage of informative characters for phylogeny reconstruction than the most variable plastid regions, allowing tests of hypotheses regarding polyploid origins. Given the necessity for rapidly evolving low-copy nuclear genes, researchers studying hybridization and polyploidy may increasingly turn to complex sequence data.

journal_name

Am J Bot

journal_title

American journal of botany

authors

Brokaw JM,Hufford L

doi

10.3732/ajb.0900388

subject

Has Abstract

pub_date

2010-09-01 00:00:00

pages

1457-73

issue

9

eissn

0002-9122

issn

1537-2197

pii

ajb.0900388

journal_volume

97

pub_type

杂志文章

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