Chromosome number and genome size variation in Colocasia (Araceae) from China
2017
Wang, G.Y. ((Chinese Academy of Sciences, Kunming, Yunnan (China). Kunming Institute of Botany, Key Laboratory for Plant Diversity and Biogeography of East Asia), (Chinese Academy of Sciences, Kunming, Yunnan (China). Kunming Institute of Botany, Germplasm Bank of Wild Species), (Anqing Normal University, Anqing, Anhui (China). School of Life Sciences, The Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui)) | Zhang, X.M. | Qian, M. | Hu, X.Y. | Yang, Y.P.
Chromosome number and genome size are important cytological characters that significantly influence various organismal traits. We investigated chromosome number and genome size variation in 73 accessions belonging to four Colocasia species from China. Five different chromosome counts (2n=26, 28, 38, 42, and 56) were found, the largest one representing a new record in Colocasia. The basic chromosome numbers are x=13, 14, and 19, corresponding to 2x, 3x, and 4x cytotypes. Yunnan Province, China is considered the center of Colocasia polyploid origin. The 2C values in our accessions ranged from 3.29pg in C. gigantea to 12.51pg in C. esculenta. All species exhibit inter- and intraspecific chromosomal variation. Differences in DNA content among the Colocasia species seem to have occurred by chromosomal gain under similar habitats. Polyploidization also obviously contributes to 2C value variation.
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