Cytology of Some W. Himalayan Ranunculaceae

Mehra, P. N.; Remanandan, P.

doi:10.1508/cytologia.37.281

Cited by 25 publications

(32 citation statements)

References 8 publications

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“…A. polyanthes D. Don It has been collected from hill slopes at an altitude of 3,200 m. Meiosis of the species shows 2n=14 in the PMCs at M-I and 7 : 7 distribution of chromosomes at each pole during A-I (Figs. 1/1b, c).The present chromosome count of 2n=14 is in conformity with the previous report from India (Mehra and Kaur 1963). The species is also known to have 2n=16 from India (Bir et al 1987) and outside India.…”

Section: A Obtusiloba D Donsupporting

confidence: 92%

“…This count of 2n=14 is in conformity with the previous reports from India and from outside India. The species is also previously known to have 2n=10 (Bhattarai 1989), 2n=16 (Bhattacharjee and Sharma 1980) and 2n=26 (Mehra and Remanandan 1972) from India. A. polyanthes D. Don It has been collected from hill slopes at an altitude of 3,200 m. Meiosis of the species shows 2n=14 in the PMCs at M-I and 7 : 7 distribution of chromosomes at each pole during A-I (Figs.…”

Section: A Obtusiloba D Donmentioning

confidence: 85%

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Cytogenetic Study on Five Species of Genus <i>Anemone</i> L. (Ranunculaceae) from the Western Himalayas, India

Kumar

Kumari²,

Gupta³

2014

CYTOLOGIA

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Summary During the present course, population-based meiotic studies were carried out on five species of genus Anemone from selected localities of Himachal Pradesh in the Western Himalayas (India). Varied intraspecific morphotype and B-chromosome were reported in A. obtusiloba. Impaired male meiosis was noted in all populations of A. obtusiloba, A. polyanthes, A. rivularis, A. tetrasepala, and A. vitifolia. These anomalous species were marked with meiotic abnormalities in the form of cytomixis, chromosomal stickiness, unoriented bivalents, formation of laggards and bridges resulting in abnormal microsporogenesis, and production of heterogeneous-sized fertile pollen grains along with reduced pollen fertility.

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Section: A Obtusiloba D Donsupporting

confidence: 92%

Section: A Obtusiloba D Donmentioning

confidence: 85%

Cytogenetic Study on Five Species of Genus <i>Anemone</i> L. (Ranunculaceae) from the Western Himalayas, India

Kumar

Kumari²,

Gupta³

2014

CYTOLOGIA

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“…1i). The same tetraploid chromosome number 2nϭ28 has been reported earlier by Mehra and Kaur (1963) Holmgren and Holmgren (1998). cytotype with 2nϭ14 has been reported earlier by Koul and Gohil (1973) from Kashmir Himalayas.…”

Section: Ranunculus Diffusus DCsupporting

confidence: 85%

“…Consequently, the products of PMCs results in some pollen sterility/unstained pollen grains and heterogeneous sized stained/fertile pollen grains. The same tetraploid chromosome number, 2nϭ32, has been recorded in the species by various researchers from other regions of India (Mehra and Kaur 1963, Sharma and Sarkar 1967-1968, Roy and Sharma 1971, Mehra and Remanandan 1972, Bir and Thakur 1984, Chatterjee et al 1989, Kumar et al 2008a). But we here report the existence of cytomixis for the first time in the species.…”

Section: Ranunculus Diffusus DCsupporting

confidence: 70%

Male Meiotic Studies in Some Plants of Polypetalae from Dalhousie Hills (Himachal Pradesh)

2010

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Summary Male meiosis and pollen fertility studies have been performed in 35 species belonging to 25 genera and 13 families of Polypetalae from the Dalhousie hills. Impatiens laxiflora (nϭ6) was counted chromosomally for the first time. Corydalis cornuta (nϭ8), Erysimum hieracifolum (nϭ16), Arenaria serpyllifolia (nϭ10), Drymaria diandra (nϭ13), Geranium lucidum (nϭ14), Nasturtium officinale (nϭ16), Geum roylei (nϭ21) and Chaerophyllum reflexum (nϭ11) are worked out chromosomally for the first time in India. New cytotypes are recorded for Thalictrum saniculiforme (nϭ14), Drymaria diandra (nϭ13), Geranium lucidum (nϭ14) and Chaerophyllum reflexum (nϭ11). Present chromosome counts for the rest of the species substantiate earlier reports by other researchers. Intraspecific diploid (nϭ12) and tetraploid (nϭ24) cytotypes recorded presently from Dalhousie hills in Oxalis corniculata are morphologically indistinguishable. The phenomenon of cytomixis involving inter PMC (pollen mother cell) migration of chromatin material has been observed in Ranunculus diffusus (nϭ16), Thalictrum foliolosum (nϭ7), T. saniculiforme (nϭ14), Gypsophila cerastioides (nϭ15), Oxalis corniculata (nϭ24), Murraya koenigii (nϭ9), Geum roylei (nϭ21), Potentilla atrisanguinea (nϭ21) and Pimpinella diversifolia (nϭ9). Cytomixis in these species results in various meiotic abnormalities and heterogeneous sized pollen grains. In the remaining species, the meiosis is normal, leading to high pollen fertility.

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“…Malik and Mary (1970) have also reported the presence of up to 4 B-chromosomes in the individuals of these populations. The chromosome record of 2n=40 by Mehra and Remanandan (1972) needed confirmation because Kurosawa (1971) reported earlier from the same locality the existence of a hexaploid cytotype with 2n=48. The species has been worked out quite extensively from several other regions of the world which included Russia, Europe, North America, Arctic region and Asia, and was reported to exhibits an array of chromosome numbers such as 2n=16, 28,32,35,44,48,52,54,55,56,57,58,60,64,68,70,72, 88 depicting a reticulum of polyploid derivatives.…”

Section: Resultsmentioning

confidence: 96%

Cytological studies in some plants from cold deserts of India, Lahaul and Spiti (Himachal Pradesh)

2009

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ABSTRACT. Detailed meiotic course and pollen fertility studies have been carried out in 23 species belonging to 14 families from the Indian cold deserts of Lahaul-Spiti. Out of these, new chromosome counts have been made in the three species, Chrysanthemum pyrethroides (2n=3x=27, 2n=4x=36), Waldhemia stoliczkai (n=9) and W. tomentosa (n=9). Meiotic course is abnormal in both the triploid and tetraploid cytotypes of C. pyrethroides which include univalents at metaphase, late disjunction of bivalents, formation of restitution nuclei at anaphase-I and chromatin bridges. Subsequently, microsporogenesis is also abnormal and is characterized by the occurrence of high frequency of monads, diads, triads, polyads, and micronuclei. These meiotic irregularities lead to high pollen sterility in both the cytotypes. Six species, Aquilegia fragrans (n=7), Astragalus bicuspis (n=8), Cicer microphyllum (n=8), Bergenia stracheyi (n=17), Sedum ewersii (n=11), Datisca cannabina (n=11) and Silene vulgaris (n=12) are worked out chromosomally for the first time from India. An additional/varied intraspecific aneuploid cytotype has been recorded in Hypericum elodeoides (n=9) against the earlier report of 2n=16 from other parts of India and elsewhere. The phenomenon of cytomixis involving inter PMC migration of chromatin material has been recorded in Anemone rivularis (n=8), Caltha palustris (n=16), Meconopsis aculeata (n=28) and Potentilla fruticosa var. rigida (n=7). Cytomixis in Anemone rivularis (n=8) and Caltha palustris (n=16) resulted into high percentage of pollen malformation and heterogenous sized fertile pollen grains. In the remaining species, the meiosis is perfectly normal leading to very high pollen fertility. Our counts for rest of the species substantiate the previous chromosome reports by other workers. Lahaul-Spiti, a cold desert in the north-west Himalaya and the largest district of Himachal Pradesh with an area of ca.12, 210 km 2 , comprises two sub-divisions as LahaulSpiti. Kunzum Pass (4,550 m) keeps these two subdivisions isolated from each other for more than six months due to heavy snowfall. The area is more desolate and barrenness is the rule here. Climate of Lahaul -Spiti varies considerably. Rainfall in the area is very scanty. Snowfall occurs in winter. August is the hottest month with temperature rising up to 30°C during day time, while January is the coldest when mercury dips up to -30°C or below. Except the periods of rain or snowfall, the air is very dry in both the summer and winter, and strong winds blow almost throughout the year. Consequently, the plants tend to become prostrate, thick, bushy, hardy, and spiny with long roots and small succulent or woolly leaves. Majority of the plants are perennials and survive through underground parts. Due to geographical isolation and specific ecological conditions, the flora of the area shows plenty of endemics. Further, consequent to harsh climate conditions and high incidence of UV rays the plants of the area expected to show a considerable amount of genetic d...

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Cytology of Some W. Himalayan Ranunculaceae

Cited by 25 publications

References 8 publications

Cytogenetic Study on Five Species of Genus <i>Anemone</i> L. (Ranunculaceae) from the Western Himalayas, India

Cytogenetic Study on Five Species of Genus <i>Anemone</i> L. (Ranunculaceae) from the Western Himalayas, India

Male Meiotic Studies in Some Plants of Polypetalae from Dalhousie Hills (Himachal Pradesh)

Cytological studies in some plants from cold deserts of India, Lahaul and Spiti (Himachal Pradesh)

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