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

Abstract

Summary Cytomixis associated with chromosomal anomalies was recorded in the meiotic division of pollen mother cells of the wild genotypes of Chlorophytum tuberosum (Roxb.) Baker for the first time. The migration of chromosomal substances was more prevalent in Meiosis-I than Meiosis-II. Cytomixis has been found both in juxtaposed cells by direct contact as well as between remote cells through cytoplasmic strands. During cytomixis, various chromosomal abnormalities, such as chromosomal stickiness, laggards, chromosomal bridges, unequal separation of chromosome, micronuclei formation and loss of chromosome, were recorded. A significant number of empty pollen formations leading to pollen sterility was recorded which is assumed to be a direct result of cytomixis.

Cytogenetic Characterization of Three Populations of <i>Hedeoma multiflorum</i> Benth. (Lamiaceae) Native from Córdoba, Argentina

“…According to Massoud et al (2011), univalent chro-mosomes formed during late prophase stages by precocious chiasma terminalization in early metaphase I result in laggard formation; these laggards fail to reach the poles in time to be included in the main telophase nucleus and lead to the formation of micronuclei. The occurrence of all these abnormalities could be genetically controlled (Maich and Manero 2007), but also could be highly influenced by physiological and environmental factors (Prieto García et al 2005, Loza et al 2005, Mandal et al 2013.…”

Induced cytomictic variations and syncyte formation during microsporogenesis in Phaseolus vulgaris L.

“…High incidence of chromosomal stickiness was visible in all the phases of meiosis I and meiosis II. The occurrence of the induction of meiotic irregularities as a consequence of cytomixis in plants by different inves tigators are available as well [18,42]. The formation of binucleated PMC's, aneuploid cells, hypolpoid cells, hyperploids cells, syncytes and aberrant microspores such as monad, dyads, polyads etc.…”