Analysis of the genitor origin of an intergeneric hybrid clone between Zea and Tripsacum for forage production by McGISH

文献类型： 外文期刊

第一作者： Yan, Xu

作者： Yan, Xu;Li, Yingzheng;Wu, Zizhou;Li, Yang;Wen, Xiaodong;Li, Xiaofeng;He, Ruyu;Yang, Chunyan;Zhao, Yanli;Cheng, Mingjun;Zhang, Ping;Sam, Ebenezer Kofi;Rong, Tingzhao;He, Jianmei;Tang, Qilin;Yan, Xu;Yan, Xu;Yang, Chunyan;Cheng, Mingjun

作者机构：

关键词： Zea; Tripsacum; perennial forage maize; McGISH; forage breeding

期刊名称：BREEDING SCIENCE （ 影响因子：2.086； 五年影响因子：2.632 ）

ISSN： 1344-7610

年卷期： 2020 年 70 卷 2 期

页码：

收录情况： SCI

摘要： In this study, the chromosome number and composition of a novel perennial forage crop, 'Yucao No. 6' (Yu6), was revealed by chromosome spread and McGISH (multicolor gcnomic in situ hybridization) techniques to clarify its genitor origin. Cytogenetic analysis showed that Yu6, which has 56 chromosomes, is an aneuploid representing 12, 17 and 27 chromosomes from Zea mays ssp. mays L. (Zm, 2n = 2x = 20), Tripsacum dactyloides L. (Td, 2n = 4x = 72), and Z. perennis (Hitchc.) Reeves & Mangelsd. (Zp, 2n = 4x = 40), respectively. This finding indicates that Yu6 is the product of a reduced egg (n = 36 = 12Zm + 17Td + 7Zp) of MTP (a near-allohexaploid hybrid, 2n = 74 = 20Zm + 34Td + 20Zp) fertilized by a haploid sperm nucleus (n = 20Zp) of Z. perennis. Moreover, 3 translocated chromosomes consisting of the maize-genome chromosome with the segment of Z. perennis were observed. These results suggest that it is practical to develop perennial forage maize by remodeling the chromosomal architecture of MTP offspring with Z. perennis as a pollen parent. Finally, the overview of forage breeding in the Zea and Tripsacum genera was discussed.

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