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Genome size and chromosome ploidy identification in pear germplasm represented by Asian pears - Local pear varieties

文献类型： 外文期刊

作者： Niu, Yingying 1 ; Zhou, Weiquan 1 ; Chen, Xiangying 1 ; Fan, Guoquan 2 ; Zhang, Shikui 2 ; Liao, Kang 1 ;

作者机构： 1.Xinjiang Agr Univ, Coll Hort & Forestry, Res Ctr Characterist Fruit Tree, Urumqi 830052, Xinjiang, Peoples R China

2.Xinjiang Acad Agr Sci, Luntai Natl Fruit Germplasm Resources Garden, Luntai 841600, Xinjiang, Peoples R China

关键词： Xinjiang; Pear varieties; Genome size; Chromosome ploidy

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）

ISSN： 0304-4238

年卷期： 2020 年 265 卷

页码：

收录情况： SCI

摘要： Pear (Pyrus) germplasm resources in Xinjiang were rich, most of which were diploid. Including dozens of varieties such as Pyrus bretschneideri Rehd. (P-br), Pyrus pyrifolia Nakai. (P-py), Pyrus ussuriensis Maxim. (P-us), Pyrus conununis L. (P-co), Pyrus betulifolia Bunge. (P-be), Pyrus sinkiangensis Yu. (P-si). The P-si was mainly distributed in Shanshan, Turpan, Korla, Aksu and other places. The genetic background of the main varietieswas not completely clear.The genome size and chromosome ploidy of main pear varieties in Xinjiang were identified by flow cytometry (FCM) and the traditional chromosome pressing method. The results showed that, the genome size of P-xj was 566.54 +/- 125.17 Mb, slightly larger than that of the introduced varieties, with a 2C values of 1.16 +/- 0.26 pg and a ploidy value (DI) of 1.1 +/- 0.24. Twenty-four P-xj were diploid with 34 chromosome numbers. The genome sizes of introduced P-br, P-py, P-us, P-be, and P-co were 485.44 +/- 10.05 similar to 567.94 +/- 44.40 Mb, and the 2C values was 0.99 +/- 0.02 similar to 1.16 +/- 0.10 pg. The DI was 0.9 +/- 0.06 similar to 1.0 +/- 0.09, the FCM detection indicated that they were diploid; the number of chromosomes was 34.There were differences in genome size between pear with the same ploidy. The genome size of all diploid pear was 480.95 +/- 16.24 similar to 599.14 +/- 38.36 Mb, the 2C values was 0.98 +/- 0.03 pg similar to 1.23 +/- 0.08 pg, and the DI was 0.9 +/- 0.00 similar to 1.2 +/- 0.06. A total of 5 polyploid materials were found in this study: 'Yilikamut', 'Kotoame, 'Aiwenqicke', 'Heisuanli' and 'Sha01', it can provide materials for the innovation and utilization of pear germplasm resources. The results of this study can provide technical support for Pyrus plant on ploidy breeding and omics study, and also a reference for other plants.

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