Chromosomal Karyotype Analysis of Four Varieties of Green Petioles Leaf Beet

2018 3rd International Conference on Insulating Materials, Material Application and Electrical Engineering

材料科学;无线电电子学;电工学

Sun, Bo^1 ; Tian, Yuxiao^1 ; Xia, Xue^1 ; Zhang, Fen^1 ; Tang, Haoru^1

College of Horticulture, Sichuan Agricultural University, Chengdu

611130, China^1

关键词: Chromosome analysis;    Chromosome numbers;    Karyotype analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/452/2/022073/pdf
DOI  :  10.1088/1757-899X/452/2/022073

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Chromosome analysis of four varieties of green petioles leaf beet was performed by pressing plate's method. The results revealed the chromosome numbers of all four varieties of green petioles leaf beet was 2n = 2x = 18. And their centromere type was mainly composed by metacentric chromosomes (m) and sub metacentric chromosomes (sm), while the number of m was more than sm. However, evident variation among varieties was presented on their karyotype formula, karyotype type, satellitic position, and arm ratio, ratio of chromosome length (L/S) and index of karyotypic asymmetry. Although they all had one pair of satellites, the location of the satellites was different. The karyotype type contained 1A from 'Zhongnong', 'Huaxianzi' and 2A from 'Lifeng', 'Huaguan'. Statistically ratio of chromosome length for tested varieties ranged from 1.20 in 'Lifeng' to 1.52 in 'Zhongnong', and average arm ratio ranged from 1.42 in 'Zhongnong' to 1.62 in 'Huaguan'. The index of karyotypic asymmetry of 'Zhongnong', 'Huaxianzi', 'Lifeng', 'Huaguan' were 58.50%, 59.21%, 58.79% and 61.32%, respectively. This study revealed the karyotypic characteristics of leaf beet from the cytogenetic aspect, and provided a reference for variety breeding of leaf beet.