Abstract
This study presents cytological investigations of nine species of three genera: Canscora, Gentiana and Swertia of family Gentianaceae from different geographical regions of Kashmir and Himachal Pradesh in the Western Himalayas. Chromosome numbers, detailed meiotic course and pollen fertility have been studied for each species. The study includes five new chromosome counts with first chromosome reports for Gentiana aprica (2n = 20), G. argentea var. albescens (2n = 20), G. pygmea (2n = 20) and varied reports for Swertia ciliata (2n = 26) and Swertia purpurascens (2n = 18). Some studied taxa are marked with almost normal meiosis and high pollen fertility and some are with abnormal meiotic course in the form of unoriented chromosomes, chromatin stickiness, interbivalent connections/secondary bivalent associations, laggards, bridges, etc., in minor fractions. Base numbers in the three genera are briefly discussed with respect to available world level chromosome data.
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Claims 7
Claim · model-written summary
Gentiana aprica has a newly reported chromosome count of 2n = 20.
Verbatim
e0“Gentiana aprica (2n = 20)”
t0“New chromosome counts in some gentians from Western Himalayas”
Claim · model-written summary
G. argentea var. albescens has a newly reported chromosome count of 2n = 20.
- Taxon
- G. argentea var. albescensGentiana argenteae0t0
- Outcome
- chromosome countst0
- Value
- 2n = 20e0
Verbatim
e0“G. argentea var. albescens (2n = 20)”
t0“New chromosome counts in some gentians from Western Himalayas”
Claim · model-written summary
G. pygmea has a newly reported chromosome count of 2n = 20.
Verbatim
e0“G. pygmea (2n = 20)”
t0“New chromosome counts in some gentians from Western Himalayas”
Claim · model-written summary
Swertia ciliata has a varied chromosome count report of 2n = 26.
- Taxon
- Swertia ciliataSwertia ciliatae0t0
- Outcome
- chromosome countst0
- Value
- 2n = 26e0
Verbatim
e0“Swertia ciliata (2n = 26)”
t0“New chromosome counts in some gentians from Western Himalayas”
Claim · model-written summary
Swertia purpurascens has a varied chromosome count report of 2n = 18.
- Taxon
- Swertia purpurascensSwertia purpurascense0t0
- Outcome
- chromosome countst0
- Value
- 2n = 18e0
Verbatim
e0“Swertia purpurascens (2n = 18)”
t0“New chromosome counts in some gentians from Western Himalayas”
Claim · model-written summary
Some studied taxa show almost normal meiosis and high pollen fertility.
Verbatim
e0“Some studied taxa are marked with almost normal meiosis and high pollen fertility”
Claim · model-written summary
Some studied taxa show abnormal meiotic courses in minor fractions.
Verbatim
e0“Some studied taxa are marked with almost normal meiosis and high pollen fertility and some are with abnormal meiotic course in the form of unoriented chromosomes, chromatin stickiness, interbivalent connections/secondary bivalent associations, laggards, bridges, etc., in minor fractions”