Abstract
A survey of the species of the genus Nicotiana was carried out to determine the distribution and the cytological characteristics of heterochromatin in this genus. All examined species of the genus possess knob‐type heterochromatin, which is defined as spherical, densely staining regions of the pachytene chromosomes. These knobs are most frequently located near the centromere, the nucleolar organizer, and the ends of the chromosomes. Block‐type heterochromatin, defined as any longer‐than‐broad heterochromatic segment seen at pachytene, was found in three species of the section Paniculatae, three species of the section Tomentosae, and two species of the section Noctiflorae. Three categories of the block‐type heterochromatin, corresponding to the three subgenera, were found to differ with respect to overall size, staining properties, and location of the blocks. The distribution of these three types of block heterochromatin is discussed in the light of the latest taxonomic treatments of the genus.
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Claims 6
Claim · model-written summary
All examined Nicotiana species possess knob-type heterochromatin.
NicotianaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of the species of the genus Nicotiana was carried out to determine the distribution and the cytological characteristics of heterochromatin in this genus”
e1“All examined species of the genus possess knob”
e2“defined as spherical, densely staining regions of the pachytene chromosomes”
Claim · model-written summary
Block-type heterochromatin was found in three species of section Paniculatae.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of the species of the genus Nicotiana was carried out to determine the distribution and the cytological characteristics of heterochromatin in this genus”
e3“was found in three species of the section Paniculatae, three species of the section Tomentosae, and two species of the section Noctiflorae”
Claim · model-written summary
Block-type heterochromatin was found in three species of section Tomentosae.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of the species of the genus Nicotiana was carried out to determine the distribution and the cytological characteristics of heterochromatin in this genus”
e3“was found in three species of the section Paniculatae, three species of the section Tomentosae, and two species of the section Noctiflorae”
Claim · model-written summary
Block-type heterochromatin was found in two species of section Noctiflorae.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of the species of the genus Nicotiana was carried out to determine the distribution and the cytological characteristics of heterochromatin in this genus”
e3“was found in three species of the section Paniculatae, three species of the section Tomentosae, and two species of the section Noctiflorae”
Claim · model-written summary
The three block-type heterochromatin categories differ in overall size, staining properties and location of the blocks.
- Outcome
- overall size, staining properties, and location of the blockse4
- Qualifier
- corresponding to the three subgenerae4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of the species of the genus Nicotiana was carried out to determine the distribution and the cytological characteristics of heterochromatin in this genus”
e4“corresponding to the three subgenera, were found to differ with respect to overall size, staining properties, and location of the blocks”
Claim · model-written summary
Knobs are most frequently located near the centromere, the nucleolar organizer and the chromosome ends.
- Outcome
- knobse5
- Qualifier
- most frequently located near the centromere, the nucleolar organizer, and the ends of the chromosomese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A survey of the species of the genus Nicotiana was carried out to determine the distribution and the cytological characteristics of heterochromatin in this genus”
e5“These knobs are most frequently located near the centromere, the nucleolar organizer, and the ends of the chromosomes”