Cytotaxonomic survey of some tropical ornamental species. III. Haemanthus multiflorus martyn (Amaryllidaceae).

Nwankiti, O. C.

doi:10.1508/cytologia.49.497

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…The karyotypes reported for the genus all seem to include 2 pairs of long chromosomes, while remaining 8 pairs are more or less gradually decreasing in size from medium to small (Fernandes andNeves 1962, Oyewole 1987). Exception for this is U. altissima where 3 submetacentric chromosomes are reported by Nwankiti (1983).…”

Section: Observationsmentioning

confidence: 92%

Cytotaxonomical studies in Indian Urginea Steinhill species.

Yadav

Dixit

1990

CYTOLOGIA

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and reduced to five species. A survey of literature indicated that U. indica and U. polyantha are the only taxa studied cytologically while remainings are unexplored from the cytotaxonomic point of view. The present investigation, therefore, reports the comparative karyomorphological analysis in four species of Urginea, viz. U. congesta Wight, U. razii (Ansari) Deb et Dasgupta, U. polyantha Blatter and McCann and U. indica Kunth. It is of particular interest to note that a species U. polyphylla Hook. has not been included in present studies because in spite of extensive field trips, authors could not locate it. Its exact natural origin is badly documented, its collector is known to be Heyne (Hooker 1892). After Heyne, there is no report of its occurrence and therefore its presence seems to be doubtful. However, this problem cannot be settled on the basis of the available herbarium specimens alone, relocation of this species in its natural habit is still urgently required.

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Section: Observationsmentioning

confidence: 92%

Cytotaxonomical studies in Indian Urginea Steinhill species.

Yadav

Dixit

1990

CYTOLOGIA

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“…2). On the basis of chromosome morphology and Levitsky's theory (1931), Nwankiti (1983) categorized Drimia as highly advanced genus. Chromosome morphology in Indian Drimia species showed similarity in general and indicates close relationship (Nwankiti, 1983).…”

Section: Resultsmentioning

confidence: 99%

“…On the basis of chromosome morphology and Levitsky's theory (1931), Nwankiti (1983) categorized Drimia as highly advanced genus. Chromosome morphology in Indian Drimia species showed similarity in general and indicates close relationship (Nwankiti, 1983). However, on the basis of chromosome morphology, Dixit & Yadav (1989) showed close resemblance in D. indica , D. polyantha , and D. coromandeliana .…”

Section: Resultsmentioning

confidence: 99%

Biosystematics and evolutionary studies in Indian Drimia species

Desai

Kawalkar

Dixit

2012

J of Sytematics Evolution

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The taxonomic position and genetic relationship within Indian Drimia species is controversial due to their morphological similarities and genomic complexities. The present work gives an insight on the genetic relationship between Indian Drimia species on the basis of their karyotype, pollen morphology, flower opening characteristics, hybridization behavior, and by use of DNA sequence of two molecular markers (internal transcribed spacers [ITS] and maturase K [matK]). The karyotypic studies of Indian Drimia species revealed various polyploid forms making their identification and delimitation more difficult. The five species of Indian Drimia are grouped into two complexes, indica complex and wightii complex on the basis of their pollen morphology, karyotype, and hybridization behavior. These two groups were found to be evolving separately. The cytomorphological studies of wightii complex revealed that it is evolving through polyploid and chromosome repatterning, while indica complex have adapted polyploid as well as hybridization for evolution. Phylogeny obtained from DNA sequences of molecular markers (ITS and matK) confirmed that the indica complex and wightii complex are evolving parallely, by grouping them in two clusters. Thus, a combination of conventional and molecular methods proved to be of great use for delimiting a small but complex group of Indian Drimia species.

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Cytotaxonomic survey of some tropical ornamental species. III. Haemanthus multiflorus martyn (Amaryllidaceae).

Cited by 3 publications

References 2 publications

Cytotaxonomical studies in Indian Urginea Steinhill species.

Cytotaxonomical studies in Indian Urginea Steinhill species.

Biosystematics and evolutionary studies in Indian Drimia species

Cytotaxonomic survey of some tropical ornamental species V. Karyotype of two species of the genus Crinum and a related genus Hymenocallis.

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