Abstract
The present work deals with population-based meiotic studies on eight species belonging to four genera of the family
Commelinaceae from different regions of Kangra Valley which is well known for its rich floristic diversity. At the
world level, different cytotypes for four species such as Commelina hasskarlii (2n = 22, 60), C. kurzii (2n = 60),
Murdannia nudiflora (2n = 24) and M. spirata (2n = 24) have been recorded for the first time at various ploidy
levels. Additionally, from India, the new chromosome count for Tradescantia pallida (2n = 24) has been reported
at the tetraploid level. The course of meiosis has been found to be normal in all the populations of Commelina
benghalensis, C. paludosa, Murdannia nudiflora and M. spirata while four species, Commelina hasskarlii,
C. kurzii, Cyanotis cristata and Tradescantia pallida have shown a normal to abnormal meiotic course in different
populations. These meiotic abnormalities have revealed a clear effect on the pollen size and pollen fertility.
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