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Toward the sequence-based breeding in legumes in the post-genome sequencing era

机译:在后基因组测序时代朝豆类中基于序列的育种迈进

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摘要

Efficiency of breeding programs of legume crops such as chickpea, pigeonpea and groundnut has been considerably improved over the past decade through deployment of modern genomic tools and technologies. For instance, next-generation sequencing technologies have facilitated availability of genome sequence assemblies, re-sequencing of several hundred lines, development of HapMaps, high-density genetic maps, a range of marker genotyping platforms and identification of markers associated with a number of agronomic traits in these legume crops. Although marker-assisted backcrossing and marker-assisted selection approaches have been used to develop superior lines in several cases, it is the need of the hour for continuous population improvement after every breeding cycle to accelerate genetic gain in the breeding programs. In this context, we propose a sequence-based breeding approach which includes use of independent or combination of parental selection, enhancing genetic diversity of breeding programs, forward breeding for early generation selection, and genomic selection using sequencing/genotyping technologies. Also, adoption of speed breeding technology by generating 4–6 generations per year will be contributing to accelerate genetic gain. While we see a huge potential of the sequence-based breeding to revolutionize crop improvement programs in these legumes, we anticipate several challenges especially associated with high-quality and precise phenotyping at affordable costs, data analysis and management related to improving breeding operation efficiency. Finally, integration of improved seed systems and better agronomic packages with the development of improved varieties by using sequence-based breeding will ensure higher genetic gains in farmers’ fields.
机译:在过去的十年中,通过部署现代基因组工具和技术,豆类作物如鹰嘴豆,木豆和花生的育种计划的效率已大大提高。例如,下一代测序技术促进了基因组序列装配的可用性,几百个品系的重新测序,HapMaps的开发,高密度遗传图谱,一系列标志物基因分型平台以及与许多农艺学相关的标志物的鉴定这些豆类作物的性状。尽管在某些情况下使用了标记辅助的回交和标记辅助的选择方法来开发优良品系,但在每个育种周期后,需要一小时的时间来不断进行种群改良,以加快育种程序的遗传增益。在这种情况下,我们提出了一种基于序列的育种方法,该方法包括使用父母选择的独立或组合,增强育种程序的遗传多样性,用于早期选择的正向育种以及使用测序/基因分型技术进行基因组选择。此外,每年产生4至6代的速育技术的采用将有助于加速遗传增益。尽管我们看到基于序列的育种在这些豆类中革新作物改良计划的巨大潜力,但我们预计将面临一些挑战,特别是与以可承受的成本进行高质量和精确的表型鉴定,与提高育种操作效率相关的数据分析和管理有关的挑战。最后,通过使用基于序列的育种,将改良的种子系统和更好的农艺组合与改良品种的开发相结合,将确保农民田间获得更高的遗传增益。

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