Molecular mapping of high grain number QTLs in aromatic rice line RNR-2354
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
Basmati, the unique quality aromatic rice, is natureās gift to the Indian sub-continent. Basmati rice is harmonious combination of aroma, kernel expansion, fluffiness and palatability. Compared to indica varieties, Basmati rice is low yielding primarily because of lower number of grains (70 to 80) per panicle. Therefore, present study is planned to increase the grain number of Punjab Basmati 3 (PB-3). It is a semi-dwarf variety having resistance to the bacterial blight disease of rice (xa 13 and Xa 21 genes), possesses extra- long slender and translucent grains with strong aroma and good cooking and eating quality characteristics. RNR-2354, one of the rice aromatic rice line was found having very high grain number (150- 200) per plant while evaluating and characterizing 400 aromatic rice germplasm lines from all over India. With an objective of improving grain number of PB-3, a cross between PB-3 and RNR-2354 was done to generate F1, F2 and F3 progenies. Phenotypic data were recorded for grain number, grain length and grain width in F2 population and F3 progenies. A total of 5 QTLs designated as qGN-1, qGN-2.1, qGN-2.2, qGN-3 and qGN-5 were mapped on chromosome 1, 2, 3 and 5 using QTL Cartographer mapping software. This information could be further used for narrowing down and dissecting the regions harboring putative QTLs.
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