文献类型： 外文期刊

作者： An, Z. ¹ ; Tang, Z. ¹ ; Ma, B. ³ ; Mason, A. S. ⁴ ; Guo, Y. ¹ ; Yin, J. ¹ ; Gao, C. ¹ ; Wei, L. ¹ ; Li, J. ¹ ; Fu, D.;

作者机构： 1.Southwest Univ, Engn Res Ctr South Upland Agr, Coll Agron & Biotechnol, Minist Educ, Chongqing, Peoples R China

2.Gansu Acad Agr Sci, Crop Res Inst, Lanzhou, Peoples R China

3.Southwest Univ, State Key Lab Silkworm Genome Biol, Chongqing, Peoples R China

4.Univ Queensland, Ctr Integrat Legume Res, Brisbane, Qld, Australia

5.Univ Queensland, Sch Agr

关键词： Allopolyploidisation;Brassica;interspecific hybridisation;transposable element;transposon activation

期刊名称：PLANT BIOLOGY （ 影响因子：3.081； 五年影响因子：2.972 ）

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收录情况： SCI

摘要： Although many studies have shown that transposable element (TE) activation is induced by hybridisation and polyploidisation in plants, much less is known on how different types of TE respond to hybridisation, and the impact of TE-associated sequences on gene function. We investigated the frequency and regularity of putative transposon activation for different types of TE, and determined the impact of TE-associated sequence variation on the genome during allopolyploidisation. We designed different types of TE primers and adopted the Inter-Retrotransposon Amplified Polymorphism (IRAP) method to detect variation in TE-associated sequences during the process of allopolyploidisation between Brassica rapa (AA) and Brassica oleracea (CC), and in successive generations of self-pollinated progeny. In addition, fragments with TE insertions were used to perform Blast2GO analysis to characterise the putative functions of the fragments with TE insertions. Ninety-two primers amplifying 548 loci were used to detect variation in sequences associated with four different orders of TE sequences. TEs could be classed in ascending frequency into LTR-REs, TIRs, LINEs, SINEs and unknown TEs. The frequency of novel variation (putative activation) detected for the four orders of TEs was highest from the F_1 to F_2 generations, and lowest from the F_2 to F_3 generations. Functional annotation of sequences with TE insertions showed that genes with TE insertions were mainly involved in metabolic processes and binding, and preferentially functioned in organelles. TE variation in our study severely disturbed the genetic compositions of the different generations, resulting in inconsistencies in genetic clustering. Different types of TE showed different patterns of variation during the process of allopolyploidisation.