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Molecular Breeding

, Volume 34, Issue 4, pp 1933–1942 | Cite as

Breeding value estimation of the application of IPA1 and DEP1 to improvement of Oryza sativa L. ssp. japonica in early hybrid generations

  • Quan Xu
  • Na Xu
  • Hai Xu
  • Liang Tang
  • Jin Liu
  • Jian SunEmail author
  • Jiayu WangEmail author
Article

Abstract

Rice (Oryza sativa L.) is a major food component of over half of the world’s population, and increased grain yield is a major goal of rice production. Two important yield-related genes are DEP1, regulating inflorescence internode length, and IPA1, involved in plant architecture. The dep1 allele gives rise to a dense, erect panicle shape, while the ipa1 allele leads to a reduced number of tillers and an increased number of grains per panicle. In this study, we focused on the breeding effects of dep1 and ipa1 using two F2 populations derived from cultivars carrying these alleles. Analysis of yield components in the F2 populations revealed that dep1 and ipa1 have contradictory effects, with the exception of number of panicles and spikelet density. The two dep1 and ipa1 alleles can offset each other’s negative advantage for some traits. The performance of yield components is consistent with the requirements of ideal plant type in northeast China once the individuals are heterozygous at two loci. By considering genetic analysis data and previous studies, we speculate that DEP1 and IPA1 loci make genetic contributions of additive, dominance and epistasis effects to yield components. Our results should provide a valuable reference for developing hybrid japonica rice by direct application of F1 plants heterozygous at the two loci and for shortening the breeding period for conventional japonica rice by rapidly fixing superior genotype combinations in early hybrid generations.

Keywords

IPA1 DEP1 Yield components Gene combination High-yield breeding 

Notes

Acknowledgments

This work was supported by Grants from the ‘Major Science and Technology Projects for New GMO Breeding’ program (2011ZX08001-004 and 2014ZX08001-004).

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Rice Research Institute of Shenyang Agricultural University/Key Laboratory of Northern Japonica Rice Genetics and Breeding, Ministry of Education and Liaoning Province/Key Laboratory of Northeast Rice Biology and Genetics and BreedingMinistry of AgricultureShenyangChina
  2. 2.Rice Applied Genomics Research Unit, Agrogenomics Research CenterNational Institute of Agrobiological Sciences (NIAS)TsukubaJapan

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