First Report of Cytomixis and Meiotic Abnormalities in &lt;i&gt;Nepeta govaniana&lt;/i&gt; from Solang Valley, Kullu District, Himachal Pradesh

Kaur, Maninder; Singhal, Vijay Kumar

doi:10.1508/cytologia.79.227

Cited by 12 publications

(4 citation statements)

References 29 publications

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“…Chromosomal stickiness observed in the present study was either mild or intense. Chromosomal stickiness was reported by the number of workers in various flowering plants (Tripathi and Kumar 2010, Kaur and Singhal 2012, 2014, Rana et al 2013, Rashid et al 2021. Late disjunction of chromosomes was also observed in the present study, which might be due to abnormal spindle formation.…”

Section: Meiotic Behavior and Irregularities Concerning Pollen Viabil...supporting

confidence: 80%

Meiotic Bottlenecks Compromises Reproductive Success by Impairing Pollen Fertility and Seed Set in Swertia thomsonii C. B. Clarke—An Important Endemic Medicinal Herb of Western Himalaya

et al. 2022

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Comprehensive studies on meiotic behavior and pollen biology of a species are crucial for its conservation strategies. The presence of meiotic bottlenecks directly or indirectly influences the reproductive success of a plant species. The present study records chromosome number, male meiotic behavior, seed set, pollen viability, and pollen germination in two populations of Swertia thomsonii, an important medicinal plant of Himalaya. The chromosome count recorded in both accessions was 2n=2x=26, however; chromosomal abnormalities (21.23 and 4.31%) were recorded in population 1 (Pop-1) and population 2 (Pop-2), respectively. These include chromosomal stickiness, out of the plate, formation of laggards, abnormal spindles, bridges, multipolarity, and polysporads. These meiotic irregularities compromise pollen viability, pollen germination, and seed set of species. The possible cause for these recorded meiotic abnormalities was cold stress as the species grows in temperate or sub-alpine regions with cold climatic conditions. Another possible reason might be the presence of heavy metals in the soil more than permissible limits, which was determined by soil sample analysis. Therefore, these findings along with other reproductive and ecological studies can aid in the development of successful conservation and management strategies for this medicinally important plant species.

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Section: Meiotic Behavior and Irregularities Concerning Pollen Viabil...supporting

confidence: 80%

Meiotic Bottlenecks Compromises Reproductive Success by Impairing Pollen Fertility and Seed Set in Swertia thomsonii C. B. Clarke—An Important Endemic Medicinal Herb of Western Himalaya

et al. 2022

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“…The occurrence stage and frequency of cytomixis showed little difference between observed individual plants, as well at different sample times. Therefore, cytomixis seems to be a natural phenomenon controlled by genetic factors and also affected by environmental factors (Kaur and Singhal 2014).…”

Section: Discussionmentioning

confidence: 99%

Meiotic Studies and Cytomixis in Pollen Mother Cells of Salvia przewalskii Maxim.

et al. 2017

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Salvia przewalskii Maxim., which possesses high content of lipid-soluble tanshinones in roots, is a valuable medicinal plant in China. Its detailed meiotic analysis from pollen mother cells (PMCs) to tetrad was carried out for the first time. Most of the PMCs showed a regular meiotic behavior and regular chromosome segregation. Sixteen bivalents were observed in most PMCs at metaphase I, indicating that S. przewalskii was a species with chromosome number of 2n=32. However, a high-frequency of cytomixis, and transferring of chromatin or chromosome materials between adjacent pollen mother cells through cytomictic channels, were observed in PMCs at early prophase I, but rather rarely in meiosis II. Other meiotic abnormalities such as chromatin bridges, laggards, and micronucleus at low frequency were also detected in few PMCs at meiosis I and II.

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“…The present study reveals that the prevalence of severe chromatin stickiness and abnormal spindle activity seems to be responsible for meiotic abnormalities in the accession. The chromatin stickiness and various meiotic abnormalities coupled with irregular spindle activity are associated with the phenomenon of cytomixis in several cases, viz., Anemone tetrasepala (Rana et al 2013), A. rivularis (Singhal et al 2009b), Astragalus subuliformis (Ashraf and Gohil 1994), Dactylis (Falistocco et al 1995), Clematis flammula (Kumar et al 2008b), Hippophae rhamnoides , Clematis orientalis , C. montana , C. graveolens (Singhal and Kaur 2011a), Vicia pallida (Singhal and Kaur 2011b), Thalictrum foetidum , Dianthus angulatus , Spergularia diandra , Silene vulgaris (Kumar et al 2014) and Nepeta govaniana (Kaur and Singhal 2014). Although the phenomenon of cytomixis has not been observed in the presently studied accessions, cytomixis has already been reported in the species from other regions of the Northwest Himalayas .…”

Section: Discussionmentioning

confidence: 99%

Chromatin Stickiness and Abnormal Spindle Resulting in Meiotic Irregularities and Pollen Sterility in Meconopsis aculeata Royle from the Northwest Himalayas

2016

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Summary Detailed meiotic investigations were performed in three accessions of Meconopsis aculeata scored from high altitudinal regions in the Northwest Himalayas. These accessions exhibit the same chromosome number of n=28 and exist at tetraploid level. We report here the occurrence of chromatin stickiness and abnormal spindle activity in the presently studied accessions. Consequent to chromatin stickiness and abnormal spindle activity, various irregularities were observed at different stages of meiosis. These include inter-bivalent connections, out-of-plate bivalents, laggards and chromatin bridges during anaphases/telophases resulting in the formation of abnormal sporads like triads, tetrads with micronuclei and polyads. The products of such sporads yielded heterogeneous-sized fertile and sterile pollen grains. Chromatin stickiness and abnormal spindle activity causing meiotic irregularities, abnormal sporads and pollen malformation seem to be the result of low temperature stress conditions prevailing in the area when the plants enter the flowering stage.

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First Report of Cytomixis and Meiotic Abnormalities in <i>Nepeta govaniana</i> from Solang Valley, Kullu District, Himachal Pradesh

Cited by 12 publications

References 29 publications

Meiotic Bottlenecks Compromises Reproductive Success by Impairing Pollen Fertility and Seed Set in <i>Swertia thomsonii</i> C. B. Clarke—An Important Endemic Medicinal Herb of Western Himalaya

Meiotic Bottlenecks Compromises Reproductive Success by Impairing Pollen Fertility and Seed Set in <i>Swertia thomsonii</i> C. B. Clarke—An Important Endemic Medicinal Herb of Western Himalaya

Meiotic Studies and Cytomixis in Pollen Mother Cells of <i>Salvia przewalskii</i> Maxim.

Chromatin Stickiness and Abnormal Spindle Resulting in Meiotic Irregularities and Pollen Sterility in <i>Meconopsis aculeata</i> Royle from the Northwest Himalayas

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