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QTL mapping of bio-energy related traits in Sorghum

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Abstract

Plant height (PHT), stem and leaf fresh weight (SLFW), juice weight (JW) and sugar content of stem (Brix) are important traits for biofuel production in sweet Sorghum. QTL analysis of PHT, SLFW, JW and Brix was conducted with composite interval mapping using F2 and F2:3 populations derived from the cross between grain Sorghum (Shihong137) × sweet Sorghum (L-Tian). Three QTLs controlling PHT were mapped on SBI-01, SBI-07 and SBI-09 under four different environments. These QTLs could explain 10.16 to 45.29% of the phenotypic variance. Two major effect QTLs on SBI-07 and SBI-09 were consistently detected under four environments. Eight QTLs controlling SLFW were mapped across three environments and accounted for 5.49–25.36% of the phenotypic variance. One major QTL on SBI-09 located between marker Sb5-206 and SbAGE03 was observed under three environments. Four QTLs controlling Brix were identified under two environments and accounted for 11.03–17.65% of the phenotypic variance. Six QTLs controlling JW were detected under two environments, and explained 6.63–23.56% of the phenotypic variance. QTLs for JW on SBI-07 and SBI-09 were consistent in two environments showing higher environmental stability. In addition, two chromosome regions on SBI-07 and SBI-09 were identified in our study having major effect on PHT, SFLW and JW. The results would be useful for the genetic improvement of sweet Sorghum to be used for biofuel production.

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Acknowledgments

This study was supported by Special fund for agro-scientific research in public interest from Ministry of Agriculture of China, a project of National Science and Technology Pillar Program (2007BADA7B01) from Ministry of Science and Technology of China, and the Earmarked Fund for China Agriculture Research System (CARS-06). The authors are grateful to the critical reading of reviewers, and to Professor Du Rui-hong, Millet Research Institute, Hebei Academy of Agro-forestry Sciences, for his kindly providing the Sorghum parents, L-Tian and Shihong137.

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Correspondence to Hong-gang Wang.

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Guan, Ya., Wang, Hl., Qin, L. et al. QTL mapping of bio-energy related traits in Sorghum . Euphytica 182, 431–440 (2011). https://doi.org/10.1007/s10681-011-0528-5

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