The presence of synaptic and chromosome disjunction mutants in <i>Cenchrus ciliaris</i> (Poaceae: Paniceae)

Abstract

Synaptic mutants are present in Cenchrus ciliaris L This species, due to the presence of linear bivalents and occasion­al trivalents and quadrivalents, is an intermediate desynaptic species. In addition, geographical distribution and environmental factors, such as high temperatures and low humidity, could also have had an influence on the desynapsis observed.The disjunction of chromosomes during anaphase I was mostly abnormal in this desynaptic species. Precocious disjunction of chromosomes into chromatids occurred during anaphase I Due to the high incidence of this chromosome abnormality, a mutant gene, 'pc' responsible for the disjunction of chromosomes, must be present. The absence of cytokinesis in one specimen indicates a recessive mutant gene, 'va' to be active in this species.

Keywords

• asynapsis
• desynapsis
• meiosis
• precocious chromatid segregation
• synaptic mutants