Journal ArticleDOI
Broadening the avenue of intersubgenomic heterosis in oilseed Brassica
Jun Zou,Jiali Zhu,Shunmou Huang,Entang Tian,Yong Xiao,Donghui Fu,Jinxing Tu,Tingdong Fu,Jinling Meng +8 more
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TLDR
This work initiated the development of a gene pool for new type B. napus that contained a substantial amount of genetic variation in the Ar and Cc genome and discussed new approaches to broaden the avenue of intersubgenomic heterosis in oilseed Brassica.Abstract:
Accumulated evidence has shown that each of the three basic Brassica genomes (A, B and C) has undergone profound changes in different species, and has led to the concept of the “subgenome”. Significant intersubgenomic heterosis was observed in hybrids between traditional Brassica napus and first generation lines of new type B. napus. The latter were produced by the partial introgression of subgenomic components from different species into B. napus. To increase the proportion of exotic subgenomic components and thus achieve stronger heterosis, lines of first generation new type B. napus were intercrossed with each other, and subjected to intensive marker-assisted selection to develop the second generation of new type B. napus. The second generation showed better agronomic traits and a higher proportion of introgression of subgenomic components than did the first generation. Compared with the commercial hybrid and the hybrids produced with the first generation new type B. napus, the novel hybrids showed stronger heterosis for seed yield during the 2 years of field trials. The extent of heterosis showed a significant positive correlation with the introgressed subgenomic components in the parental new type B. napus. To increase the content of the exotic subgenomic components further and to allow sustainable breeding of novel lines of new type B. napus, we initiated the development of a gene pool for new type B. napus that contained a substantial amount of genetic variation in the Ar and Cc genome. We discuss new approaches to broaden the avenue of intersubgenomic heterosis in oilseed Brassica.read more
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Journal ArticleDOI
Accessing complex crop genomes with next-generation sequencing
TL;DR: This review describes next-generation sequencing and data analysis techniques that vastly improve the ability to dissect and mine genomes for causal genes underlying key traits and allelic variation of interest to breeders.
Journal ArticleDOI
Trigenomic bridges for Brassica improvement
Sheng Chen,Matthew N. Nelson,Anne-Marie Chèvre,Eric Jenczewski,Zaiyun Li,Annaliese S. Mason,Jinling Meng,Julie A. Plummer,A. Pradhan,Kadambot H. M. Siddique,Rod J. Snowdon,Guijun Yan,Weijun Zhou,Wallace Cowling +13 more
TL;DR: Armed with new genetic resources from trigenomic bridges, Brassica breeders will be able to improve yield and broaden adaptation of Brassica crops to meet human demands for food and biofuel, particularly in the face of abiotic constraints caused by climate change.
Journal ArticleDOI
De novo genetic variation associated with retrotransposon activation, genomic rearrangements and trait variation in a recombinant inbred line population of Brassica napus derived from interspecific hybridization with Brassica rapa
Jun Zou,Donghui Fu,Huihui Gong,Wei Qian,Wei Xia,J. Chris Pires,Ruiyuan Li,Yan Long,Annaliese S. Mason,Tae-Jin Yang,Yong P. Lim,Beom Seok Park,Jinling Meng +12 more
TL;DR: In this paper, the authors constructed a population of recombinant inbred lines of the new introgressed type of B. napus (ArArCnCn) and used microsatellite, intron-based and retrotransposon markers to characterize this experimental population with genetic mapping, genetic map comparison and specific marker cloning analysis.
Journal ArticleDOI
Extending the rapeseed gene pool with resynthesized Brassica napus II: Heterosis
TL;DR: Although resynthesized Brassica napus lines do not meet the elite rapeseed standards, they are a valuable source for hybrid breeding due to their large distance from present breeding material and their high heterosis when combined with European winter oilseed rape.
References
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NTSYS-pc Numerical Taxonomy and Multivariate Analysis System, version 2.1: Owner manual
F.J. Rohlf,F Rohlf +1 more
Journal ArticleDOI
Rapid genome change in synthetic polyploids of Brassica and its implications for polyploid evolution.
TL;DR: It is demonstrated that polyploid species can generate extensive genetic diversity in a short period of time and genetic divergence among the derivatives of synthetic polyploids was evident from variation in genome composition and phenotypes.
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