Association Mapping for Quantitative Trait Loci Controlling Superoxide Dismutase, Flavonoids, Anthocyanins, Carotenoids, γ-Oryzanol and Antioxidant Activity in Rice
Ramakrushna Bastia | Elssa Pandit | Priyadarsini Sanghamitra | Saumya Ranjan Barik | Deepak Kumar Nayak | Auromira Sahoo | Arpita Moharana | Jitendriya Meher | Prasanta K. Dash | Reshmi Raj | Binod Kumar Jena | Kartik Chandra Pradhan | Devraj Lenka | Nabaneeta Basak | Srikanta Lenka | Sharat Kumar Pradhan
Antioxidant-rich rice is a cheaper way to solve stress-related disorders and other health benefits for the global rice-eating population. Five antioxidant traits, namely, superoxide dismutase, flavonoids, anthocyanins, γ-oryzanol and 2,2′-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid (ABTS) activity were mapped using a representative panel population through association mapping. Potential landraces carrying multiple antioxidant compounds were identified from the population. The population represented four genetic groups and correspondence for presence of antioxidants traits in each group was noticed. The population showed linkage disequilibrium for the studied traits based on the Fst values. A total of 14 significant marker–trait associations were detected for these antioxidant traits. The study validated the QTLs, <i>qANC3</i> and <i>qPAC12-2</i> for anthocyanin content and <i>qAC12</i> for ABTS activity will be useful in marker-assisted breeding. Eleven QTLs such as <i>qTAC1.1</i> and <i>qTAC5.1</i> controlling anthocyanin content, <i>qSOD1.1</i>, <i>qSOD5.1</i> and <i>qSOD10.1</i> for superoxide dismutase (SOD), <i>qTFC6.1</i>, <i>qTFC11.1</i> and <i>qTFC12.1</i> for total flavonoids content (TFC), <i>qOZ8.1</i> and <i>qOZ11.1</i> for γ-oryzanol (OZ) and <i>qAC11.1</i> for ABTS activity were detected as novel loci. Chromosomal locations on 11 at 45.3 cM regulating GO, TFC and TAC, and on the chromosome 12 at 101.8 cM controlling TAC and ABTS activity, respectively, were detected as antioxidant hotspots.
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