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- 저자 : Younas Rasheed Tantray (검색결과 1 건)
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Younas Rasheed Tantray,Ishrat Jan,Mohammad Saleem Wani,Vijay Kumar Singhal,Raghbir Chand Gupta 국립중앙과학관 2021 Journal of Asia-Pacific Biodiversity Vol.14 No.4
Disparity or continuity in the chromosome count within taxa of various categories has been verified to bean imperative character for taxonomic classification. Male meiotic studies in 64 species (161 accessions)of composits from geographically isolated regions were examined in detail in order to update the existingknowledge of meiotic chromosome numbers of composits from the outer part of the Himalayas. Myriactisjavanica (2n ¼ 36) and Tanacetum nubigenum (2n ¼ 36) have been counted chromosomally for the firsttime at the world level. Besides, Koelpinia linearis (2n ¼ 36), Ajania fruticulosa (2n ¼ 18), Crepis flexuosa(2n ¼ 14), and Tanacetum gracile (2n ¼ 18) have been analyzed chromosomally for the first time fromIndia. New intraspecific diploid/polyploid cytotypes are added for Artemisia desertorum (2n ¼ 6x ¼ 54),Carduus nutans (2n ¼ 4x ¼ 16), Erigeron annuus (2n ¼ 2x ¼ 18), Leontopodium jacotianum (2n ¼ 4x ¼ 48),Pentanema indicum (2n ¼ 6x ¼ 54), Scorzonera virgata (2n ¼ 2x ¼ 16), and Tragopogon pratensis(2n ¼ 2x ¼ 12). Besides, eight species have been evaluated cytologically for the first time from KashmirHimalayas. Various meiotic abnormalities like cytomixis, structural heterozygosity, chromatin stickiness,nonsynchronous disjunction, laggards, bridges, unoriented chromosomes leading to pollen sterility havebeen observed for the first time in some species. The presence of B-chromosomes has been detected inAchillea millefolium (2n ¼ 18þ0-1B) and Saussurea candolleana (2n ¼ 26þ0-1B). Among meioticallyanalyzed species, diploids (76.5%) and polyploids (23.5%) prevail.
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