Identification of genomic locations associated with grain micronutrients (iron and zinc) in rice (Oryza sativa L.)
2022
Pippal, Amit | Bhusal, Nabin | Meena, Rahul Kumar | Bishnoi, Mahavir | Bhoyar, Pratik Istari | Jain, Rajinder K.
In this investigation, recombinant inbred lines (RILs) population derived from PAU 201 (high yielding) and Palman 579 (high iron and zinc content) varieties were phenotyped in F₅ and F₆ generations for grain micronutrient content. The results showed high genetic variations among RILs and exceeded trait values beyond those of parents revealing transgressive segregants. Pearson’s correlation coefficient analysis showed that iron content had a significant positive correlation with zinc content in both generations. Composite interval mapping identified 16 QTLs on linkage groups 2, 6, 10, and 12. Eight QTLs were for zinc content and four for iron content, and four for grain yield per plant. The maximum number of QTLs were detected on chromosome 2, followed by chromosomes 12 and 10. The LOD score of identified QTLs varied from 3.7 (qYp10) to 18.43 (qFe2) explaining 51.8% and 52.8% phenotypic variation, respectively. Co-localization of QTLs (qZn12.2, qFe12, and qYp12) associated with zinc content, iron content, and grain yield in 12 between the marker interval RM 2734 and RM12 represents 5.1 cM distance, could be used for introgression for rice improvement through marker-assisted selection after validation.
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