Marker-assisted introgression of opaque2 allele for rapid conversion of elite hybrids into quality protein maize (original) (raw)

Abstract

Maize is a valuable source of food and feed worldwide. Maize endosperm protein is, however nutritionally poor due to the reduced levels of two essential amino acids, lysine and tryptophan. In this study, recessive opaque2 (_o_2) allele that confers enhanced endosperm lysine and tryptophan, was introgressed using marker-assisted backcross breeding into three normal inbred lines (HKI323, HKI1105 and HKI1128). These are the parental lines of three popular medium-maturing single cross hybrids (HM4, HM8 and HM9) in India. Gene-based simple sequence repeat (SSR) markers (umc1066 and phi057) were successfully deployed for introgression of _o_2 allele. Background selection using genome-based SSRs helped in recovering \(>96\%\) of recurrent parent genome. The newly developed quality protein maize (QPM) inbreds showed modified kernels (25–50% opaqueness) coupled with high degree of phenotypic resemblance to the respective recipient lines, including grain yield. In addition, endosperm protein quality showed increased lysine and tryptophan in the inbreds to the range of 52–95% and 47–118%, respectively. The reconstituted QPM hybrids recorded significant enhancement of endosperm lysine (48–74%) and tryptophan (55–100%) in the endosperm. The QPM hybrids exhibited high phenotypic similarity with the original hybrids for morphological and yield contributing traits along with responses to some major diseases like turcicum leaf blight and maydis leaf blight. The grain yield of QPM hybrids was at par with their original versions under multilocation testing. These elite, high-yielding QPM hybrids with improved protein quality have been released and notified for commercial cultivation, and hold significant promise for improving nutritional security.

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Acknowledgements

Financial support from the Department of Biotechnology, Government of India, through the project entitled ‘Rapid conversion of normal maize inbreds to quality protein maize and further enhancement of limiting amino acids in elite inbreds through marker-assisted selection’ (BT/PR11708/AGR/02/649/2008) is gratefully acknowledged. We thank Dr Sain Dass, former Director, ICAR-IIMR, New Delhi for his valuable suggestions. We also thank ICAR-IIMR, New Delhi; CCSHAU, Uchani; and CIMMYT, Mexico, for sharing the inbred lines, used in this study. The support of AICRP-Maize in conducting the multilocation trials is duly acknowledged.

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  1. Boddupalli M. Prasanna
    Present address: International Maize and Wheat Improvement Centre (CIMMYT), 1041-00621, , Nairobi, Kenya

Authors and Affiliations

  1. ICAR-Indian Agricultural Research Institute (IARI), New Delhi, 110 012, India
    Firoz Hossain, Vignesh Muthusamy, Neha Pandey, Ashish K. Vishwakarma, Aanchal Baveja, Rajkumar U. Zunjare, Nepolean Thirunavukkarasu, Supradip Saha, Kanchikeri M. Manjaiah, Boddupalli M. Prasanna & Hari S. Gupta

Authors

  1. Firoz Hossain
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  2. Vignesh Muthusamy
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  3. Neha Pandey
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  4. Ashish K. Vishwakarma
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  5. Aanchal Baveja
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  6. Rajkumar U. Zunjare
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  7. Nepolean Thirunavukkarasu
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  8. Supradip Saha
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  9. Kanchikeri M. Manjaiah
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  10. Boddupalli M. Prasanna
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  11. Hari S. Gupta
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Correspondence toFiroz Hossain.

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Corresponding editor: Arun Joshi

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Hossain, F., Muthusamy, V., Pandey, N. et al. Marker-assisted introgression of opaque2 allele for rapid conversion of elite hybrids into quality protein maize.J Genet 97, 287–298 (2018). https://doi.org/10.1007/s12041-018-0914-z

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