Temperature Sensitive Cytomixis in Helicanthes elastica (Desr.) Dans. (Loranthaceae).

Soman, T. A.; Bhavanandan, K. V.

doi:10.1508/cytologia.58.21

Cited by 14 publications

(15 citation statements)

References 18 publications

(18 reference statements)

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“…Some possible causes attributed to cytomixis are effect of fixation (Woodworth 1931, Jacob 1941, Linnert 1955, Takats 1959, Gottschalk 1970, mechanical injury (Sarvella 1958), pathological conditions (Bobak andHerich 1978, Morisset 1978), temperature anomalies (Basavaiah andMurthy 1987, Soman andBhavannandan 1993), polyploid level (Verma et al 1984), hybrid condition (Narain 1979, Yen et al 1993, cell response as a consequence of pesticides and antibiotic dosages (Kumar and Sinha 1991), abnormal genetic behavior due to treatment with chemical mutagen (Kumar andSrivastava 2001, Kumar andSharma 2002), crop culture condition (Pierozzi and Benatti Jr. 1998), failure of cell wall formation at premeiotic mitosis (Gates and Rees 1921, Beadle 1932, Kamra 1960, and genetically controlled behaviour (Brown andBertke 1974, De Mantu andSharma 1983). However, cytomixis in the present case may be attributed to either genetic or physiological factors.…”

Section: Resultsmentioning

confidence: 99%

Cytomixis in Pollen Mother Cells of Spearmint (Mentha spicata L.).

Tyagi

2003

CYTOLOGIA

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SummaryCytomixis was recorded during microsporogenesis in a tetraploid (2nϭ4xϭ48) genotype of spearmint (Mentha spicata L.), an aromatic plant of the family Lamiaceae. The phenomenon of cytomixis was observed in leptotene to pachytene stages of the first meiotic prophase. The migration of nuclear content involved all the chromosomes or part of the chromosomes of the donor cell. The occurrence of PMCs with chromosome numbers deviating from the tetraploid number (2nϭ48), derived from the process of cytomixis indicated the possibility of aneuploid and polyploid gamete production. The pollen fertility was found to be affected by this phenomenon and it seems possible that genetic factors might have also contributed towards the pollen sterility.

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Section: Resultsmentioning

confidence: 99%

Cytomixis in Pollen Mother Cells of Spearmint (Mentha spicata L.).

Tyagi

2003

CYTOLOGIA

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“…) and with changes in environmental conditions (Lattoo et al . ) including temperature stress (Soman & Bhavanandan ; Malallah & Attia ). The chilling‐induced cytomixis observed here may have been responsible for the reduced pollen viability and might have contributed to the reduced grain set in the plants exposed to 0–1 °C night temperatures for 1 week.…”

Section: Discussionmentioning

confidence: 99%

Chilling to zero degrees disrupts pollen formation but not meiotic microtubule arrays in Triticum aestivum L.

Barton

Cantrill

Law

et al. 2014

Plant Cell & Environment

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Throughout the wheat-growing regions of Australia, chilling temperatures below 2 °C occur periodically on consecutive nights during the period of floral development in spring wheat (Triticum aestivum L.). In this study, wheat plants showed significant reductions in fertility when exposed to prolonged chilling temperatures in controlled environment experiments. Among the cultivars tested, the Australian cultivars Kite and Hartog had among the lowest levels of seed set due to chilling and their responses were investigated further. The developmental stage at exposure, the chilling temperature and length of exposure all influenced the level of sterility. The early period of booting, and specifically the +4 cm auricle distance class, was the most sensitive and corresponded to meiosis within the anthers. The response of microtubules to chilling during meiosis in Hartog was monitored, but there was little difference between chilled and control plants. Other abnormalities, such as plasmolysis and cytomixis increased in frequency, were associated with death of developing pollen cells, and could contribute to loss of fertility. The potential for an above-zero chilling sensitivity in Australian spring wheat varieties could have implications for exploring the tolerance of wheat flower development to chilling and freezing conditions in the field.

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“…Some authors have attributed to cytomixis an evolutionary significance, but it is still a subject of debate. Cytomixis may have played a role in the origin of aneuploid plants (Sarvella 1958), in the genesis of diploid gametes (Falistocco et al 1995) or in the origin of B-chromosomes (Soman and Bhavanandan 1993). A putative gene control to cytomixis was also proposed by Bellucci et al (2003) based on crossings involving alfafa lines possessing low and high cytomixis rates.…”

Section: Discussionmentioning

confidence: 99%