Preliminary chromosome studies on Hippeastrum species from Vietnam
2015
Hang, T.T.M. (Vietnam National University of Agriculture, Hanoi (Vietnam). Faculty of Agronomy, Department of Horticulture) | Phuong, P.T.M. | Dung, T.T.M. | Miyajima, I.
Hippeastrum plants collected from different provinces of Vietnam and grown in the greenhouse at the Vietnam National University of Agriculture exhibit diversity in several morphological characteristics, especially in flower size and color. In order to understand the karyotypes and the phylogenesis of Hippeastrum species in Vietnam, somatic chromosome counts and karyotyping were performed for 97 Hippeastrum accessions. Chromosome counts showed that most (62 of 97 accessions, or 63.9%) Hippeastrum accessions in this collection are diploid with somatic chromosome number 2n = 2x = 22. Three accessions, or 3.1%, are triploid (2n = 3x = 33). This collection includes 32 tetraploids, or 33%, that have chromosome number 2n = 4x = 44. The karyotypes of three Hippeastrum species in Vietnam, including H. x 'Johnsonii', H. puniceum, and H. reticulatum var. striatifolia Herb. were analyzed. Karyotype variation among these three species included differences in chromosome lengths, long arm to short arm ratios, centromere positions, and chromosomes types. These species carry one to three unequal pair(s) of chromosomes in their chromosome complements. The results of this research will be useful for identification and classification of Hippeastrum species and subspecies.
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