Cytomixis during Microsporogenesis in Some Populations of <i>Croton bonplandianum</i> of North India

Abstract

Summary Present investigations were carried out to study the microsporogenesis in populations of Croton bonplandianum Baill. from 5 cities of north India. The chromosome count of nϭ10 was uniform in all the populations. Among the analysed populations 32.50-40.96% of PMCs were recorded to be interconnected through cytoplasmic connections, with many of them showing actual transfer of genetic material between the cells. Cytomixis was observed to involve 2-8 cells at a time. Presence of laggards and resultant micronuclei has been observed in all the populations. As a result of cytomixis and its associated abnormalities heterogeneous pollen size and variation in pollen fertility were also recorded.

Meiotic behavior and pollen fertility in triploid and tetraploid natural populations of Campuloclinium macrocephalum (Eupatorieae, Asteraceae)

“…These suggestions are supported by our findings of high frequency of abnormal chromosome behavior throughout the whole meiotic process. However, cytomixis could be affecting pollen fertility (Baptista-Giacomelli et al 2000;Saggoo et al 2011;Srivastava and Kumar 2011). Few studies have focused on polyploid weedy species: e.g., Chondrilla juncea (Burdon J et al 1981), Cortaderia jubata (Costas-Lippmann 1979Drewitz and DiTomaso 2004), Eupatorium adenophorum (Baker H et al 1965;Khonglam and Singh 1980), E. riparium (Khonglam and Singh 1980), E. odoratum (Khonglam and Singh 1980), Hypericum perforatum (Pritchard 1960), Taraxacum officinale (Richards 1970), Hieracium sp.…”