Cytomixis in Pollen Mother Cells of Polygonum tomentosum Schrank.

Cytomixis and Associated Meiotic Abnormalities in Pollen Mother Cells of <i>Chlorophytum tuberosum</i> (Roxb.) Baker

“…The higher rate of chromatin transfer in the first meiotic division, in comparison to the second division, observed here for all the individuals, is also in accordance with the findings of earlier reports (De and Sharma 1983, Consolaro and Pagliarini 1995, Bellucci et al 2003, Lattoo et al 2006. A host of anomalies, such as spindle disturbance, unequal separation of chromosomes, chromosomal bridges, lagging and early or late separation of chromosomes, stickiness of chromosomes, excess chromatin and formation of micronuclei, all observed for C. tuberosum in this study, comply with the findings of previous researchers (Sheriff 1957, Kumar and Rao 1958, Pagliarini et al 1993, Haroun 1995, Lattoo et al 2006, Singhal and Kumar 2008, Zhen-Qiao and Xing-Feng 2009 in this species as well as in many other plant species. The formation of micronuclei (Figs.…”

“…1j Kwiatkowska et al (2003) and Ventela et al (2003) claimed cytomixis to happen in lower plants as well as during the spermatogenesis of animals. Cytomixis by cytoplasmic strands and direct contact of cells in the species, that under study here, is supported by the observations of similar occurrences in different plants made by other researchers (De and Sharma 1983, Sapre and Deshpande 1987, Bahl and Tyagi 1988, Haroun 1995, Singhal and Kumar 2008, Zhen-Qiao and Xing-Feng 2009. The higher rate of chromatin transfer in the first meiotic division, in comparison to the second division, observed here for all the individuals, is also in accordance with the findings of earlier reports (De and Sharma 1983, Consolaro and Pagliarini 1995, Bellucci et al 2003, Lattoo et al 2006.…”

Phenomenon of Cytomixis and Intraspecific Polyploidy (2<i>x</i>, 4<i>x</i>) in <i>Spergularia diandra</i> (Guss.) Heldr. & Sart. in the Cold Desert Regions of Kinnaur District (Himachal Pradesh)

“…Chromatin transfer occurred through long sized cytoplasmic channels forming 1-2 chromatin strands involving 2 PMCs in 1.52-5.88% cases from late stages of meiosis-I and continued up to T-II. The same results are found in some cases where the transfer of chromatin or chromosomes may take place until the later stages of meiosis and the size of cytomictic channels may increase to form conspicuous transfer of chromatin material among inter-PMCs (Falistocco et al 1995, Haroun 1995, Singhal and Kumar 2008a, b, 2010, Shabrangi et al 2010, Mursalimov and Deineko 2011. The inter-PMCs transfer of chromatin material results in chromosome stickiness and consequently pollen sterility.…”

Meiotic Abnormalities in Populations of <i>Heracleum lanatum</i> Michx. —An Endemic and Threatened Medicinal Plant from Lahaul & Spiti Cold Desert Region of North Indian Higher Altitude Himalayas

“…During meiotic course in plant populations, a few interbivalent connections were reported at metaphase and anaphase stages but it was already suggested by Falusi (2006) in Capsicum, that interbivalent connections observed mainly during the diplotene and diakinesis stages. Many researchers have already given their different opinions and explanations regarding the cause and significance of the cytomixis, such as effect of fixation of the plant material, physiological controls, chemicals and herbicides, pathological changes, pollution, temperature and stress effects and also due to genetic controls (Haroun 1995, Bell 1964, Haroun et al 2004, Morisset 1978, Narain 1976, Ghanima and Talaat 2003 During anaphase and telophase the presence of laggards was found in several populations (P-1, 2, 4, 6) with the highest frequency of 8.33% in population-1, with the lowest being 0.92% in population-4, as reported in the present study (Fig. 5).…”