Evolutionary History of the Genus Capsella (Brassicaceae) - Capsella orientalis , New for Mongolia
To elucidate the evolutionary history of the genus Capsella , we included the hitherto poorly known species C. orientalis and C. thracica into our studies together with C. grandifl ora , C. rubella , and C. bursa-pastoris . We sequenced the ITS, and four loci of noncoding c...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
National University of Mongolia
2014-12-01
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| Series: | Mongolian Journal of Biological Sciences |
| Subjects: | |
| Online Access: | http://mjbs.num.edu.mn/uploads/files/MJBS%20Volume%2012%20Number%201-2%20December%202014/pdf/mjbs-12-3-18-neuffer.pdf |
| Summary: | To elucidate the evolutionary history of the genus
Capsella
, we included the hitherto
poorly known species
C. orientalis
and
C. thracica
into our studies together with
C.
grandifl ora
,
C. rubella
, and
C. bursa-pastoris
. We sequenced the ITS, and four loci of
noncoding cpDNA regions (trnL – F, rps16, trnH – psbA, trnQ – rps16). In common
garden fi eld experiments
C. orientalis
turned out as early fl owering with a specifi c leaf
type. The crossing ability of the species was tested in pollen germination experiments.
Capsella orientalis
(self-compatible, SC; 2n = 16) forms a clade (eastern lineage)
with C
. bursa-pastoris
(SC; 2n = 32), which is a sister clade (western lineage) to
C.
grandifl ora
(self-incompatible, SI; 2n = 16) and
C. rubella
(SC; 2n = 16).
Capsella
bursa-pastoris
is an autopolyploid species of multiple origin, whereas the Bulgarian
endemic
C. thracica
(SC; 2n = 32) is allopolyploid and emerged from interspecifi c
hybridisation between
C. bursa-pastoris
and
C. grandifl ora
. The common ancestor
of the two lineages was diploid and SI, and its distribution ranged from eastern
Europe to central Asia, predominantly confi ned to steppe like habitats. Biogeographic
dynamics during the Pleistocene caused geographic and genetic subdivisions within
the common ancestor giving rise to the two extant lineages.
Capsella orientalis
is
verifi ed at several positions in western Mongolia. |
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| ISSN: | 1684-3908 2225-4994 |