Indian Society of Genetics & Plant Breeding

Identifcation of genomic regions associated with grain zinc concentration in RILs derived from popular cultivar MTU1010 and BR2655 of rice

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In the present study seven quantitative traits and grain zinc content were evaluated using 190 recombinant inbred lines (RILs) derived
from MTU 1010 and BR 2655 during wet season (WS) 2016 and dry season (DS) 2016-17. A total of 948 SSR markers used for parental
polymorphism, of which 119 were found polymorphic. The linkage map of 1874.09 cM with an average marker interval of 331.23 cM was
constructed using 60 polymorphic SSR markers with clear resolution. Nine QTLs on chromosome 1, 2, 4, 5, 9, 10 and 12 were detected for
eight traits in WS 2016 and DS 2016-17. Among the nine QTLs, number of productive tillers per plant (
qNPT-5.1) accounted for highest
phenotypic variance (7.54%) over both the seasons. A stable QTL for grain zinc (
qZn-2.1) wasdetected on chromosome 2 flanked between
RM13347 and RM262 with phenotypic variance of 7.74% (WS) and 10.2% (DS). Therefore, these QTLs and marker information could be
validated further and utilized in the marker-assisted selection to improve nutritional trait (zinc) in rice.

Keywords: Biofortifcation, genetic enhancement, grain zinc genetic variation, QTL mapping, rice.


Year: 2021
Volume: 81
Issue: 4
Article DOI: 10.31742/ISGPB.81.4.6
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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