Abstract
The systematic and taxonomic position of Biebersteinia Stephan has long been in dispute. The present paper describes for the first time the karyomorphology of two species in Biebersreinia Stephan. Both species commonly showed the interphase nuclei of the simple chromocenter type and the mitotic prophase chromosomes of the interstitial type. The karyotype formulae of both B. heterostemon and B. odora were 2n=10=2m(2sec)+8sm(2sec), belonging to the 3A type of Stebbins＇ classification. The karyotype of this genus is recorded for the first time. The basic chromosome numbers of four of the five known species of Biebersteinia have been recorded as x=5. The combination of resting nuclei of the simple chromocenter type, mitotic prophase chromosomes of the interstitial type, two pairs of chromosomes with four obvious secondary constrictions at the mitotic prophase and metaphase stages, and the peculiar 3A karyotype in Biebersteinia can be regarded as the karymorphological marker of this genus. The karyomorphological data presented here do not support the traditional grouping of this genus in Geraniaceae. The unique karyomorphology of Biebersteinia justifies its familiar or ordinal status, which is congruent with embryological, anatomical, chemical and molecular data. The systematic position of Biebersteinia needs further study.
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Claims 7
Claim · model-written summary
Both species had simple chromocenter interphase nuclei and interstitial prophase chromosomes.
- Taxon
- Biebersteinia
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Biebersteiniat0 - Outcome
- interphase nuclei of the simple chromocenter type and the mitotic prophase chromosomes of the interstitial typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Both species commonly showed the interphase nuclei of the simple chromocenter type and the mitotic prophase chromosomes of the interstitial type”
t0“Biebersteinia”
Claim · model-written summary
B. heterostemon had the reported 2n=10 karyotype formula and 3A type.
- Taxon
- B. heterostemonBiebersteinia heterostemone0
- Outcome
- karyotype formulaee0
- Value
- 2n=10=2m(2sec)+8sm(2sec)e0
- Qualifier
- 3A typee0
Verbatim
e0“The karyotype formulae of both B. heterostemon and B. odora were 2n=10=2m(2sec)+8sm(2sec), belonging to the 3A type”
t0“Biebersteinia”
Claim · model-written summary
B. odora had the reported 2n=10 karyotype formula and 3A type.
- Taxon
- B. odoraBiebersteinia odorae0
- Outcome
- karyotype formulaee0
- Value
- 2n=10=2m(2sec)+8sm(2sec)e0
- Qualifier
- 3A typee0
Verbatim
e0“The karyotype formulae of both B. heterostemon and B. odora were 2n=10=2m(2sec)+8sm(2sec), belonging to the 3A type”
t0“Biebersteinia”
Claim · model-written summary
Four of five known species have basic chromosome number x=5.
- Taxon
- BiebersteiniaBiebersteiniae0
- Outcome
- basic chromosome numberse0
- Value
- x=5e0
- Qualifier
- four of the five known speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The basic chromosome numbers of four of the five known species of Biebersteinia have been recorded as x=5”
Claim · model-written summary
The chromosome features were regarded as a genus marker.
- Taxon
- BiebersteiniaBiebersteiniae0
- Outcome
- karymorphological markere0
- Qualifier
- 3A karyotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the peculiar 3A karyotype in Biebersteinia can be regarded as the karymorphological marker of this genus”
Claim · model-written summary
Karyomorphology did not support traditional placement in Geraniaceae.
- Taxon
- BiebersteiniaBiebersteiniat0
- Outcome
- traditional grouping of this genus in Geraniaceaee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The karyomorphological data presented here do not support the traditional grouping of this genus in Geraniaceae”
t0“Biebersteinia”
Claim · model-written summary
Unique karyomorphology was interpreted to justify familial or ordinal status.
- Taxon
- BiebersteiniaBiebersteiniae0
- Outcome
- familiar or ordinal statuse0
- Qualifier
- congruent with embryological, anatomical, chemical and molecular datae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The unique karyomorphology of Biebersteinia justifies its familiar or ordinal status, which is congruent with embryological, anatomical, chemical and molecular data”