Induced cytomictic crosstalk behaviour among micro-meiocytes of Cyamopsis tetragonoloba (L.) Taub. (cluster bean): Reasons and repercussions

Authors

  • Girjesh Kumar Plant Genetics Laboratory, Department of Botany, University of Allahabad, India
  • Shefali Singh Plant Genetics Laboratory, Department of Botany, University of Allahabad, India

DOI:

https://doi.org/10.13128/caryologia-544

Keywords:

Cyamopsis tetragonoloba, cytomixis, heterosized pollens, infraspecific polypoidy, PMCs, syncyte

Abstract

Cytomictic behaviour of chromosomes among pollen mother cells was observed in mutagenic studies in cluster bean (Cyamopsis tetragonoloba (L.) Taub.). The study of pollen mother cells (PMC) revealed various chromosomal aberrations among which cytomixis was notified due to its obtrusive peculiarity and is therefore given description in this article. Cytoplasmic and chromatin transmigration were discernible among contiguous or slightly distant PMCs through recreation of passage via direct cell-to-cell fusion or channel formation. This cytomictic phenomenon was invariably more pronounced at meiosis I as compared to meiosis II. Plasmodesmatal connections play a paramount role in aiding this behaviour by establishing intercellular crosstalks. The cellular intermingling resulted in syncyte cells which were identified due to their doubled size. Syncyte or unreduced PMC formation leading to unreduced fertile gametes is speculated to act as a possible way out for infraspecific polyploidization of species. Pollen fertility was computed, alongwith this heterosized pollens of varying diameter were segregated. Large sized pollens were 2n pollens; where size difference is a consequence of cytomixis. Cytoplasmic connections among pollens were also observed sporadically. It is opined that syncyte formation and 2n pollen production have evolutionary significance.

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Author Biography

Girjesh Kumar, Plant Genetics Laboratory, Department of Botany, University of Allahabad, India

Prof. Girjesh Kumar, is a Professor at Department of Botany, University of Allahabad. His area of research interest includes Cell biology, Plant cytogenetics and Plant breeding. He has research experience of nearly 40 years and this course of time he has published numerous research publications in journals of high repute. He has supervised 27 PhD thesis under his guidance till date. He has been felicitated numerous times for his exceptional contribution in the field of Crop Science and Plant Cytogenetics. 

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Published

2020-04-13

How to Cite

Kumar, G., & Singh, S. (2020). Induced cytomictic crosstalk behaviour among micro-meiocytes of Cyamopsis tetragonoloba (L.) Taub. (cluster bean): Reasons and repercussions. Caryologia, 73(2), 111–119. https://doi.org/10.13128/caryologia-544

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