Cytomixis in Lamiaceae.

Kundu, Anadi Kumar; Sharma, Arun Kumar

doi:10.1508/cytologia.53.469

Cited by 20 publications

(14 citation statements)

References 10 publications

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“…A similar case in which cytomixis was observed in all the meiotic stages was reported in Mentha piperita (Kundu and Sharma 1988). Passage of nuclear materials was also reported in telo phase II in Vigna (Sen and Bhattacharya 1988).…”

supporting

confidence: 76%

Radiation induced male sterility in Hevea brasiliensis (Willd. ex Adr. De Juss.) Muell. Arg.

et al. 1990

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supporting

confidence: 76%

Radiation induced male sterility in Hevea brasiliensis (Willd. ex Adr. De Juss.) Muell. Arg.

et al. 1990

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“…However, the frequency of PMCs involved in chromatin transfer was noticed to be at a maximum during the earlier prophase stages of meiosis-I (11.03%) compared to late stages of meiosis-I and meiosis-II (Table 1). Maheshwari (1950), Sarvella (1958), Kundu and Sharma (1988), and Sen and Bhattacharya (1988) had also suggested the early stages of meiosis-I to be more favourable for cytomixis. The transfer of chromatin from donor PMCs to recipient PMCs occurred through 1-2 narrow and broad cytomictic channels.…”

Section: Resultsmentioning

confidence: 99%

Impact of Chromatin Transfer and Spindle Abnormalities on Pollen Fertility and Pollen Size in Plantago lanceolata L.

et al. 2010

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SummaryThe phenomenon of cytomixis involving chromatin transfer and spindle abnormalities were recorded for the first time in the diploid (nϭ6) accession of Plantago lanceolata scored from Parvati Valley, Kullu District, Himachal Pradesh (India). Cytomixis with chromatin transfer involved 2-3 PMCs (pollen mother cells) at different stages of meiosis from early prophase-I to T-II, but the maximum frequency of PMCs involved in cytomixis was recorded during the early prophase stages of meiosis-I (11.03%). The transfer of chromatin material among meiocytes was observed to be both partial and complete resulting into PMCs with hypo-and hyperploid chromosome numbers (2nϭ14, 15). During cytomixis, nucleolus also transmigrated to neighbouring PMCs and the PMCs with supernumerary nucleoli also resulted. Other meiotic abnormalities associated with cytomixis included chromatin stickiness, out of plate bivalents, laggards, bridges, unoriented chromosomes during A-I/T-I and A-II/T-II, and micronuclei. The effect of chromatin transfer, spindle abnormalities and associated meiotic anomalies on meiotic behaviour, pollen fertility and pollen size has been discussed. The cytomixis in P. lanceolata seems to be a natural phenomenon under genetic control and certainly have played a role in the origin of aneuploids and polyploids. Plantago lanceolata L. (Family: Plantaginaceae), a common weed of cultivable lands, is known by several different local names at different places including, English plantain, Ribble grass, Black plantain, Snake plantain, Ribwort plantain, and Lambs's tongue. The species, which is highly polymorphic, is widely distributed in Europe from South Iceland and east to Spain, and Northern and Central Asia. Besides, it had also been introduced into several countries and is considered as an invasive weed in North America. In India, the species commonly occurrs from Kashmir to Shimla between 1500-3000 m along roadsides, meadows, ditches and wastelands. Its leaves and seeds have been used extensively as antibacterial, antidotic, astringent, antihaemorrhagic, demulcent, expectorant, laxative, ophthalmic, poultice and diuretic treatments. Internally, these have been used in the treatment of a wide range of complaints including diarrhoea, gastritis, enteritis, peptic ulcers, irritable bowel syndrome, haemorrhage, haemorrhoids, cystilis, goitre, liver disorders, worms and hay fevers (Brown 1995, Chevalier 1996. Externally, plants have been used in treating skin inflammations, malignant ulcers, cuts, dog bites, eczema, herpes, and stings (Grieve 1984). Because of its immense medicinal importance and wide distribution, the species has been studied chromosomally by several researchers from different regions of the world depicting an array of chromosome numbersϭ2nϭ12, 13, 14, 24, 96 (Darlington and Wylie 1955, Löve and Löve 1956, 1975, Fedorov 1969, Moore 1973, 1977, Goldblatt 1981, 1985, 1988, Kumar and Subramanian 1986, Goldblatt and Johnson 1990, 1991, 1994, 1998, 2000, 2003 * Corresponding author, e-mail: vksinghal53@gmail....

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“…28). According to some workers (Maheshwari 1950, Kundu and Sharma 1988, Sen and Bhattacharya 1988, early stages of meiosis are more favorable for cytomixis.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Meiotic Behavior in <i>Eremurus himalaicus</i> Baker (Liliaceae): A Rare Endemic Perennial from Kinnaur, Himachal Pradesh, India

Kumari

Saggoo

2016

CYTOLOGIA

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Summary Detailed meiotic studies have been carried out in 11 accessions of Eremurus himalaicus Baker belonging to family Liliaceae an endemic medicinal plant of the Northwestern Himalayas. E. himalaicus, due to its excessive exploitation for edible uses, is living under stress and has therefore been listed in the Red Data Book of Indian Plants as a rare species. Considering x=7 as the basic chromosome number for the species, E. himalacus revealed the diploid chromosome count of 2n=14. Out of 11 populations worked out cytologically, 3 populations of the species were normal in their meiotic behavior while the rest of the populations showed abnormal meiotic behavior. The phenomenon of cytomixis, presence of two to five nucleoli and various other meiotic abnormalities were observed in the form of unoriented bivalents, chromosome stickiness, late disjunction, laggards and bridges in eight populations. Earlier studies were limited to the counting of chromosome number, so these meiotic abnormalities were reported for the first time in the studied species. Further, the microsporogenesis was also abnormal leading to the formation of monad, dyads, triads and abnormal tetrads with the fusion among tetrads which ultimately leads to reduced pollen fertility.

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Cytomixis in Lamiaceae.

Cited by 20 publications

References 10 publications

Radiation induced male sterility in Hevea brasiliensis (Willd. ex Adr. De Juss.) Muell. Arg.

Radiation induced male sterility in Hevea brasiliensis (Willd. ex Adr. De Juss.) Muell. Arg.

Impact of Chromatin Transfer and Spindle Abnormalities on Pollen Fertility and Pollen Size in Plantago lanceolata L.

Analysis of Meiotic Behavior in <i>Eremurus himalaicus</i> Baker (Liliaceae): A Rare Endemic Perennial from Kinnaur, Himachal Pradesh, India

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