Cytomixis and meiotic abnormalities during microsporogenesis are responsible for male sterility and chromosome variations in Houttuynia cordata

Jz, Guan; Jj, Wang; Zhang, Cheng; Y, Liu; Zy, Li

doi:10.4238/2012.january.17.2

Cited by 42 publications

(25 citation statements)

References 27 publications

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“…2t). Such induced meiotic irregularities in the meiocytes involved in cytomixis have already been reported in a number of plants [18][19][20][21].…”

Section: Meiotic Course and Pollen Fertilitysupporting

confidence: 61%

Ethnomedicinal Notes and Chromosomal Status of Some Selected Herbs From Parvati Valley, Kullu District, Himachal Pradesh

Himshikha

Gupta

Singhal

et al. 2017

Int J Pharm Pharm Sci

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Objective: The objective of the present study was to enlist the ethnobotanical uses and chromosomal status of wild plants of Parvati Valley, Himachal Pradesh. Plants are locally used in curing ulcers, sores, insect bites, muscular and joint pains, pneumonia, jaundice, diarrhoea, piles, swellings, allergies and skin diseases.Methods: For documentation of ethnomedicinal information, a questionnaire containing the vernacular name, plant part/s used, medicinal uses, mode of preparation and amount of dose taken was prepared. Personnel interviews/interactions were conducted with medicine men (vaids and hakims), local healers, village elders, tribals and shepherds. The interviews were cross-validated to ascertain the facts about the local use of each plant species. Chromosomal status was determined through male meiosis by using standard acetocarmine technique.Results: Present paper contains information on ethnomedicinal uses, chromosome counts, male meiosis and pollen fertility on 62 medicinal herbs from Parvati Valley. Plants are used as a decoction, paste or powder in cooked form or as raw. Preparations are taken orally in pure form or as a mixture or with a little amount of salt, milk, honey or butter. Conclusion:Due to indiscriminate forest clearing, grazing and collection by traders, most of the species became rare and restricted to specific pockets or are now almost extinct. To preserve herbal diversity, grazing should be restricted in alpine and sub-alpine zones. Database on ethnic knowledge, chromosomal diversity, natural regeneration and distribution pattern should be prepared for designing future plans for sustainable development.

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“…2t). Such induced meiotic irregularities in the meiocytes involved in cytomixis have already been reported in a number of plants [18][19][20][21].…”

Section: Meiotic Course and Pollen Fertilitysupporting

confidence: 61%

Ethnomedicinal Notes and Chromosomal Status of Some Selected Herbs From Parvati Valley, Kullu District, Himachal Pradesh

Himshikha

Gupta

Singhal

et al. 2017

Int J Pharm Pharm Sci

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show abstract

“…Pressure differences (Tarkowska 1965, Morisset 1978 and clumped chromatin bridges during pre-meiotic anaphase (Mendes and Rijo 1951) are other explanations put forth by some authors. However, in the presently studied species, cytomixis seems to be a natural phenomenon controlled by genetic factors as has been suggested earlier by different workers (Omara 1976, De and Sharma 1983, Singhal and Gill 1985, Haroun 1995, Bellucci et al 2003, Ghanima and Talaat 2003, Lattoo et al 2006, Singhal et al 2007, Guan et al 2012.…”

Section: Discussionmentioning

confidence: 95%

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

Kaur

Singhal

2014

CYTOLOGIA

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SummaryIn the present study, we report the phenomenon of cytomixis for the first time in some individuals of Nepeta govaniana showing chromatin transfer at the different stages of meiosis I. In most of the cases, two to six PMCs are involved in chromatin transfer. The migration of chromatin is either complete or partial, resulting in denucleated, double nucleolated, hypoploid and hyperploid PMCs. Single or multiple cytoplasmic channels between two or more proximate PMCs have been observed at prophase I. PMCs involved in cytomixis showed various other meiotic irregularities such as spindle abnormalities, chromatin stickiness, asynchronous disjunction of bivalents and laggards. In the present case, the cytomixis and associated meiotic irregularities did not cause significant reduction in pollen fertility, but resulted into the formation of heterogeneously sized pollen grains. The role of such variably sized fertile pollen grains in the origin of polyploids and aneuploids can not be ruled out.

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“…Cytomixis that resulted in the production of PMCs with imbalanced complements also induced meiotic abnormalities (laggards, micronuclei) which lead to abnormal microsporogenesis and consequently pollen sterility and variable-sized pollen grains. In many of the earlier studies, cytomixis had been held directly responsible for inducing abnormal meiotic behavior, pollen sterility and pollen grains of variable sizes (Sapre and Deshpande 1987, Haroun et al 2004, Guan et al 2012. Another abnormality presently observed most frequently is that the PMCs involved in cytomixis showed stickiness in chromatin material.…”

Section: Discussionmentioning

confidence: 99%

Cytomixis and Associated Abnormalities during Male Meiosis in Lindelofia longiflora var. falconeri (Boraginaceae)

2014

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Summary Detailed male meiotic studies were made in Lindelofia longiflora (Royle ex Benth.) Baill. var. falconeri (Cl.) Brand (Family: Boraginaceae) from the cold deserts of Pangi Valley, Chamba District (Himachal Pradesh) in India. The meiotic course in some of the individuals was observed to be highly abnormal which include cytomixis involving chromatin transfer among meiocytes, spindle irregularities, chromatin stickiness and mutlipolar PMCs, resulting in abnormal sporads as dyads, triads, polyads and tetrads with micronuclei. The products of such sporads result in high pollen sterility (77%) and variable-sized pollen grains. As a consequence of cytomixis, hyperploid (73.04%), hypoploid (18.59%) and enucleated PMCs (8.37%) are resulted. The enucleated PMCs may degenerate during the later stages of meiosis while hypo-and hyperploid PMCs yielded pollen grains of variable sizes and sterile pollen grains. The phenomenon of cytomixis and associated meiotic irregularities seem to have been caused due to low temperature stress conditions prevailing in the area.

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Cytomixis and meiotic abnormalities during microsporogenesis are responsible for male sterility and chromosome variations in Houttuynia cordata

Cited by 42 publications

References 27 publications

Ethnomedicinal Notes and Chromosomal Status of Some Selected Herbs From Parvati Valley, Kullu District, Himachal Pradesh

Ethnomedicinal Notes and Chromosomal Status of Some Selected Herbs From Parvati Valley, Kullu District, Himachal Pradesh

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

Cytomixis and Associated Abnormalities during Male Meiosis in Lindelofia longiflora var. falconeri (Boraginaceae)

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