Abstract
Nyssaceae, consisting of 36 species in five genera (Camptotheca, Davidia, Diplopanax, Mastixia and Nyssa), are poorly known concerning their karyomorphology. Here we present karyomorphological features of seven species in all five genera and discuss chromosome evolution in the family. With a few dubious chromosome counts, information available shows that the chromosome number is consistent within a genus, i.e., 2n=42 in Campthotheca, Davidia and Diplopanax, 2n=44 in Nyssa, and 2n=26 in Mastixia. Their distribution on a phylogenetic tree suggests that 2n=42 is plesiomorphic with 2n=44 and 2n=26 apomorphic. Karyotype analyses show that 2n=42 of Camptotheca and Davidia comprise six sets of seven chromosomes, suggesting that Nyssaceae are of hexaploid origin with the basic number x=7.
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Claims 8
Claim · model-written summary
Camptotheca has 2n=42 chromosomes.
Verbatim
e0“the chromosome number is consistent within a genus, i.e., 2n=42 in Campthotheca, Davidia and Diplopanax”
Claim · model-written summary
Davidia has 2n=42 chromosomes.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the chromosome number is consistent within a genus, i.e., 2n=42 in Campthotheca, Davidia and Diplopanax”
Claim · model-written summary
Diplopanax has 2n=42 chromosomes.
- Taxon
- DiplopanaxDiplopanaxe0
- Outcome
- chromosome numbere0
- Value
- 2n=42e0
Verbatim
e0“the chromosome number is consistent within a genus, i.e., 2n=42 in Campthotheca, Davidia and Diplopanax”
Claim · model-written summary
Nyssa has 2n=44 chromosomes.
NyssaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the chromosome number is consistent within a genus, i.e., 2n=42 in Campthotheca, Davidia and Diplopanax”
e1“2n=44 in Nyssa”
Claim · model-written summary
Mastixia has 2n=26 chromosomes.
MastixiaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the chromosome number is consistent within a genus, i.e., 2n=42 in Campthotheca, Davidia and Diplopanax”
e2“2n=26 in Mastixia”
Claim · model-written summary
2n=42 is inferred to be plesiomorphic relative to 2n=44 and 2n=26, which are apomorphic.
- Outcome
- plesiomorphice5
Verbatim
e4“Nyssaceae, consisting of 36 species in five genera”
e5“Their distribution on a phylogenetic tree suggests that 2n=42 is plesiomorphic with 2n=44 and 2n=26 apomorphic”
Claim · model-written summary
Camptotheca and Davidia 2n=42 karyotypes comprise six sets of seven chromosomes.
- Taxon
- Camptotheca and Davidia
Camptotheca
Davidiae3 - Outcome
- Karyotype analysese3
- Value
- six sets of seven chromosomese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Karyotype analyses show that 2n=42 of Camptotheca and Davidia comprise six sets of seven chromosomes”
Claim · model-written summary
Nyssaceae is inferred to be of hexaploid origin with basic number x=7.
- Outcome
- hexaploid origine6
Verbatim
e4“Nyssaceae, consisting of 36 species in five genera”
e6“suggesting that Nyssaceae are of hexaploid origin with the basic number x=7”