Chromosome and karyotype analysis of Dendrobium spp.
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Abstract
Cytogenetics is a crucial aspect in determining the success of breeding programs for orchid plants. Chromosome contains DNA, which is the genetic information for each species. The characterized orchid chromosomes were Dendrobium lamelatum, Dendrobium macrophyllum, Dendrobium mirbelianum, Dendrobium purpureum, and Dendrobium secundum. The results showed that all Dendrobium orchids had a metacentric shape with 2n = 38 chromosomes, except for D. purpureum with 2n = 40. The size of each arm of D. lamellatum, D. macrophyllum, D. mirbelianum, D. purpureum, and D. secundum is 2.51 ± 0.55 µm to 2.67 ± 0.54 µm, 1.54 ± 0.41 µm to 1.86 ± 0.37 µm, 5.28 ± 0.16 µm to 6.31 ± 0.17 µm, 2.45 ± 0.60 µm to 2.62 ± 0.64 µm, and 2.70 ± 0. 49 µm to 2.89 ± 0.51 µm. The index value (A1) in all species showed a metacentric shape, while the index value (A2) in all species showed a deviation in chromosome size is small.
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