Studies on the cytology of legumes of Kashmir Himalaya. IV. Meiotic behaviour in 21 species of Astragalus L.

Ashraf, Mohmad; Gohil, R. N.

doi:10.1508/cytologia.54.565

Cited by 7 publications

(3 citation statements)

References 4 publications

(6 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The present chromosome count of n=8 in the species is in agreement with the earlier records of 2n=16 from Ferozpur Nullah (1,950 m) locality in the Kashmir Himalayas (Gohil et al 1981, Ashraf andGohil 1989) and other parts of the Himalayas from India (Kumari et al 1989) and some parts of southwest Asia (Ledingham 1960, Ledingham andRever 1963, for Iraq andIran) (Figs 1a-c). Ashraf and Gohil (1989) have also studied the chiasma frequency in the species, and found a positive correlation between recombination indices and the total chromatin length. (Fig.…”

Section: Meiotic Chromosome Numbersupporting

confidence: 91%

Impact of Reciprocal Translocations and Non-Synchronous Disjunction of Chromosomes on Pollen Fertility in <i>Astragalus chlorostachys</i> from the Northwest Himalayas (India)

et al. 2012

View full text Add to dashboard Cite

Summary Cytological investigations carried out on a population basis in Astragalus chlorostachysLindl. which exists at diploid level (n=8) revealed the presence of quadrivalents, the late disjunction of 1-4 bivalents and some pollen sterility (34%) in 1 accession collected from Koksar, at 3140 m in the Lahaul Valley (Lahaul-Spiti, Himachal Pradesh). The presence of quadrivalents in this diploid species seems to be a consequence of reciprocal translocations. The occurrence of structural heterozygosity in the species has been reported here for the first time. All of the other populations showed normal bivalent formation and regular sporad generation and 100% pollen fertility. The paper here discusses in detail the course of meiosis and the effect of multivalent formation and non-synchronous disjunction of bivalents on meiotic course and pollen fertility.

show abstract

Section: Meiotic Chromosome Numbersupporting

confidence: 91%

Impact of Reciprocal Translocations and Non-Synchronous Disjunction of Chromosomes on Pollen Fertility in <i>Astragalus chlorostachys</i> from the Northwest Himalayas (India)

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Previously, cytological studies have been carried out on different groups of angiosperms from the Kashmir Himalayas. The prominent contributions have been made by Mehra & Sachdeva (1971), Koul & Wakhlu (1976), Gohil & Koul (1978), Pandita & Mehra (1984), Hamal et al (1986), Ashraf & Gohil (1989), Tak & Wafai (1997), Bhat et al (1975), and Jee et al (1983). Although significant cytological work has been done from the area, much more remains to be done because of the ecologically diverse nature of these species, stressing the need to see genetic diversity at intraspecific level.…”

mentioning

confidence: 99%

Meiotic studies in some selected angiosperms from the Kashmir Himalayas

Jeelani

Kumari

Gupta

2012

J of Sytematics Evolution

View full text Add to dashboard Cite

As a part of our program to explore and evaluate genetic diversity of flowering plants of the Kashmir Himalayas, meiotic studies have been carried out on 150 wild species. Of these, Caltha alba (2n= 32), Delphinium roylei (2n= 16), D. uncinatum (2n= 16), Ranunculus palmatifidus (2n= 28), and Sedum heterodontum (2n= 14) have been cytologically worked out for the first time. New intraspecific diploid or polyploid cytotypes have been recorded for Alchemilla vulgaris (2n= 34, 96), Arabis amplexicaulis (2n= 16), Impatiens amphorata (2n= 14), I. racemosa (2n= 12), I. sulcata (2n= 16, 12), Meconopsis latifolia (2n= 14), Potentilla supina (2n= 14), Saxifraga cernua (2n= 16), Sium latijugam (2n= 24), and Vicatia coniifolia (2n= 44). Four species, Arabidopsis thaliana (2n= 10), Berberis vulgaris (2n= 28), Potentilla nubicola (2n= 14), and P. sericea (2n= 28), have been cytologically reported for the first time from India. A large number of meiotic abnormalities have been observed in most of these species, leading to a reduction in pollen fertility and production of heterogeneous‐sized pollen grains.

show abstract

“…germplasm in Kashmir along with cytology of varieties Lal Farashi, Double Kesri, Hindwand Rakam, Kichhama Trail, Sabe Alif and Tursh Nawabi. Ashraf and Gohil (1986) revealed chromosome numbers of certain species of dicots, and later (Ashraf and Gohil 1989) for the first time investigated meiotic behaviour in 21 diploid species of the genus Astragalus L. Gohil and Rather (1986) carried out cytogenetic studies of members of Polygonaceae of Kashmir including buckwheats and Rheum. Hamal et al (1986) described the nucleolar organising region (NOR) of chromosomes of Apiaceae.…”

Section: The Period 1969-1990mentioning

confidence: 99%

Cyto-genetic diversity with special reference to medicinal plants of the Kashmir Himalaya – a review

Siddique

Jeelani

2015

Caryologia

View full text Add to dashboard Cite

The present paper reviews research conducted on the cytogenetics of the plants of the Kashmir Himalaya. The review discloses that out of the total c.550 cytologically determined plants, there are c.190 genera and c.55 families of angiosperms. Among the cytologically determined species, c.50 species have been reported for the first time at global level along with varied chromosomal reports for c.110 species from the Kashmir Himalaya. The genus Jaeschkea has also been cytologically determined for the first time worldwide from the Kashmir Himalaya. The chromosome numbers in these species vary from 2n = 10 to 2n = 120 with frequency of 2n = 18 (13.73%), 2n = 16 (13.46%), 2n = 14 (7.96%) and 2n = 32 (7.41%). The reported base numbers of x = 7, x = 8, x = 9 are common ones. Most of the genera are polybasic, followed by monobasic and dibasics while tribasic taxa are least represented in the Kashmir Himalaya. New base numbers have been reported for Astragalus (x = 6), Cheiranthus (x = 6), Gypsophila (x = 13), Meconopsis (x = 7) and Saussurea (x = 18) from this region. In all, nearly 65% species are diploids and the rest (35%) are polyploids existing at various polyploid levels, with a preponderance of tetraploids. These plants depict significant level of intraspecific variability not only in chromosome numbers but also for meiotic behaviour and morphology. The knowledge of intraspecific variability of these species point out the existence of genetic diversities. Additionally, it has been observed that molecular marker studies are restricted to few plant species in the geographically diverse the Kashmir Himalaya.

show abstract

Studies on the cytology of legumes of Kashmir Himalaya. IV. Meiotic behaviour in 21 species of Astragalus L.

Cited by 7 publications

References 4 publications

Impact of Reciprocal Translocations and Non-Synchronous Disjunction of Chromosomes on Pollen Fertility in <i>Astragalus chlorostachys</i> from the Northwest Himalayas (India)

Impact of Reciprocal Translocations and Non-Synchronous Disjunction of Chromosomes on Pollen Fertility in <i>Astragalus chlorostachys</i> from the Northwest Himalayas (India)

Meiotic studies in some selected angiosperms from the Kashmir Himalayas

Cyto-genetic diversity with special reference to medicinal plants of the Kashmir Himalaya – a review

Contact Info

Product

Resources

About