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Utilization of Exotic Germplasm

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Genetics and Genomics of Rice

Part of the book series: Plant Genetics and Genomics: Crops and Models ((PGG,volume 5))

Abstract

The worldwide rice genebanks are maintaining ~225,000 rice germplasm accessions, but only a very small portion (<5 %) of this rich source of rice germplasm has been utilized in rice improvement because most of them are considered exotic. To breeders, exotic rice germplasm consists of wild rice species, different subspecies, traditional landraces, and unadapted modern varieties. Although wild rice species are known to have some valuable genes/traits, they are difficult to use in breeding because of the severe reproductive barriers and genetic drags in interspecific crosses. Recent large scale backcross (BC) breeding efforts have revealed tremendous amounts of useful genetic variation for almost any traits of agronomic importance in the primary gene pool of rice, particularly in the exotic germplasm accessions within O. sativa. This rich source of naturally occurring diversity is largely hidden at the phenotypic levels and remains poorly understood at the genomic and molecular levels. Thus, huge efforts are needed to systematically characterize this hidden genetic diversity in the core germplasm collection of O. sativa in future genetic, genomic, and breeding research. Furthermore, it is proposed that understanding how directional phenotypic selection is operating on this hidden genetic diversity in breeding populations may hold the key to fully integrate that future rice genetic/functional genomic research with breeding.

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Authors and Affiliations

  1. Institute of Crop Sciences, Shenzhen Institute of Breeding and Innovation, Chinese Academy of Agricultural Sciences, 12 South Zhong-Guan-Cun Street, Beijing, 100081, China

    Zhi-Kang Li Ph.D.

  2. Institute of Crop Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, 12 South Zhong-Guan-Cun Street, Beijing, 100081, China

    Tian-Qing Zheng Ph.D.

Authors
  1. Zhi-Kang Li Ph.D.
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  2. Tian-Qing Zheng Ph.D.
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Correspondence to Zhi-Kang Li Ph.D. .

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Editors and Affiliations

  1. of Crop Genetic Improvement, Huazhong Agricultural University National Key Laboratory, Wuhan, China, People's Republic

    Qifa Zhang

  2. The School of Plant Sciences, University of Arizona Arizona Genomics Institute, Tucson, Arizona, USA

    Rod A. Wing

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Li, ZK., Zheng, TQ. (2013). Utilization of Exotic Germplasm. In: Zhang, Q., Wing, R. (eds) Genetics and Genomics of Rice. Plant Genetics and Genomics: Crops and Models, vol 5. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-7903-1_23

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