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Chromosome stability of synthetic Triticum turgidum-Aegilops umbellulata hybrids

文献类型： 外文期刊

作者： Song, Zhongping 1 ; Zuo, Yuanyuan 1 ; Li, Wenjia 1 ; Dai, Shoufen 1 ; Liu, Gang 1 ; Pu, Zongjun 2 ; Yan, Zehong 1 ;

作者机构： 1.Sichuan Agr Univ, Triticeae Res Inst, Chengdu 611130, Peoples R China

2.Sichuan Acad Agr Sci, Crop Res Inst, Chengdu 610066, Peoples R China

3.Environm Friendly Crop Germplasm Innovat & Genet I, Chengdu 610066, Peoples R China

4.Neijiang Normal Univ, Neijiang 641000, Peoples R China

关键词： Unreduced gametes; Turgidum turgidum-Aegilops umbellulata; Variation in chromosome number and structure; Chromosome loss and gain; Molecular cytogenetics

期刊名称：BMC PLANT BIOLOGY （ 影响因子：5.3； 五年影响因子：5.9 ）

ISSN： 1471-2229

年卷期： 2024 年 24 卷 1 期

页码：

收录情况： SCI

摘要： Background Unreduced gamete formation during meiosis plays a critical role in natural polyploidization. However, the unreduced gamete formation mechanisms in Triticum turgidum-Aegilops umbellulata triploid F1 hybrid crosses and the chromsome numbers and compostions in T. turgidum-Ae. umbellulata F2 still not known. Results In this study, 11 T.turgidum-Ae. umbellulata triploid F1 hybrid crosses were produced by distant hybridization. All of the triploid F1 hybrids had 21 chromosomes and two basic pathways of meiotic restitution, namely first-division restitution (FDR) and single-division meiosis (SDM). Only FDR was found in six of the 11 crosses, while both FDR and SDM occurred in the remaining five crosses. The chromosome numbers in the 127 selfed F2 seeds from the triploid F1 hybrid plants of 10 crosses (no F2 seeds for STU 16) varied from 35 to 43, and the proportions of euploid and aneuploid F2 plants were 49.61% and 50.39%, respectively. In the aneuploid F2 plants, the frequency of chromosome loss/gain varied among genomes. The chromosome loss of the U genome was the highest (26.77%) among the three genomes, followed by that of the B (22.83%) and A (11.81%) genomes, and the chromosome gain for the A, B, and U genomes was 3.94%, 3.94%, and 1.57%, respectively. Of the 21 chromosomes, 7U (16.54%), 5 A (3.94%), and 1B (9.45%) had the highest loss frequency among the U, A, and B genomes. In addition to chromosome loss, seven chromosomes, namely 1 A, 3 A, 5 A, 6 A, 1B, 1U, and 6U, were gained in the aneuploids. Conclusion In the aneuploid F2 plants, the frequency of chromosome loss/gain varied among genomes, chromsomes, and crosses. In addition to variations in chromosome numbers, three types of chromosome translocations including 3UL2AS, 6UL1AL, and 4US6AL were identified in the F2 plants. Furthermore, polymorphic fluorescence in situ hybridization karyotypes for all the U chromosomes were also identified in the F2 plants when compared with the Ae. umbellulata parents. These results provide useful information for our understanding the naturally occurred T. turgidum-Ae. umbellulata amphidiploids.

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