Cytological observations on some west Himalayan orchids tribe: Epidendreae I (subtribes: Pogoniinae, Thuniinae, Bletiinae, Coelogyninae, Epidendrinae).

Mehra, P. N.; Kashyap, S. K.

doi:10.1508/cytologia.49.583

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“…Feng et Li, 1980and Cymbidium serratum Schlechter, 1919( Aoyama and Tanaka 1988 , Li et al 2002a , 2002b , 2003 , Long et al 2000 ), and reported extensive details on chromosome counts in somatic as well as gametic cells, presence of B-chromosomes and aneuploidy/polyploidy. Conversely, data on Indian cymbidiums mostly restrict to chromosome counts ( Mehra and Yashpal 1961 , Mehra and Bawa 1962 , Chennaveeraiah and Jorapur 1966 , Singh 1984 , Mehra and Kashyap 1983 , 1984a , b , c , d ). Vij and Shekhar (1987) did an enormous investigation on cytogenetical aspects of Indian cymbidiums.…”

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confidence: 99%

Comparative karyomorphological study of some Indian Cymbidium Swartz, 1799 (Cymbidieae, Orchidaceae)

Sharma¹,

Kumaria²,

Tandon³

et al. 2012

CCG

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Understanding the genetic resources and diversity is very important for the breeding programs and improvement of several economically important orchids like Cymbidium. Karyomorphological studies have been carried out on seven Cymbidium species, C. aloifolium (Linnaeus, 1753), C. devonianum Paxton,1843, C. elegans Lindley, 1828, C. iridioides D. Don, 1825, C. lowianum Rchb. f.,1877, C. tigrinum Parish ex Hook. f., 1864, and C. tracyanum L. Castle,1890, most of them endangered/threatened in their natural habitat. As reported earlier, the somatic chromosome number (2n = 40) has been observed in all the seven species. Distinct inter-specific variation was recorded in the arm ratio of few homologous pairs in the complements. Symmetrical or almost symmetrical karyotypes were prevalent; however significant asymmetry was reported in C. iridioides and C. tracyanum. The significance of karyotypic variation in speciation of the genus Cymbidium has been discussed. This study provides useful chromosome landmarks and evidence about genome evolution, heteromorphic chromosomes based heterozygosity, basic chromosome number and ploidy level in the genus Cymbidium.

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