Abstract
Meiotic behavior of ten pteridophyte species from Bangladesh was analyzed in the present investigation. In SMCs of Adiantum capillus-veneris, thirty distinct bivalents were enumerated. In A. caudatum 16 SMCs resulting 64 spores were observed in sporangium which appeared to be diploid sexual. A. lunulatum was found to be triploid apogamous and as diploid sexual forms, thus this species of Adiantum exhibited wide range of morphological variations. Pteris biaurita, P. graffithi and P. vittata were recorded to be n = 29 as diploid. In thelypterids, all the four species were observed to be diploid sexual except C. dentata when it was tetraploid (n = 36, 4x = 144). In C. arida, meiosis was almost regular with 2n = 72 chromosomes. C. cylindrothrix and Ampelopteris prolifera were also found to be diploid sexual, with 2n = 72 chromosomes. J. Bio-Sci. 29(1): 135-142, 2021 (June)
Highlights
Basic chromosome number along with other cytological information could be considered as important feature for diagnostic descriptions of new plant families or sub-families and may provide clues to the affinities existing between families and their classification into higher categories (Walker 1973)
Detection of regular or irregular pairing at meiotic cell division is a powerful tool for detecting the fate of a hybrid plant authentically where other evidence is inconclusive or misleading
The basic number of Adiantum was determined as n = 30 whereas n = 29 was enumerated in Pteris
Summary
Basic chromosome number along with other cytological information could be considered as important feature for diagnostic descriptions of new plant families or sub-families and may provide clues to the affinities existing between families and their classification into higher categories (Walker 1973). Due to possessing different basic chromosome number, Adiantum was segregated from Pteridaceae and placed in Adiantaceae. Mannan and Kabir previous reports it was noticed that these families are occupying the top position in respect of species number and distribution in Bangladesh. This is one of the reasons to consider these ten species under these three families for meiotic study
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