Aug 2026· International journal of agricultural sciences and veterinary medicine· Vol 14, pp. 1· 0 citations
Abstract
In the current study, a marker-assisted backcross
breeding (MABB) strategy was employed to transfer
two bacterial blight (BB) resistance genes (Xa21 and
xa13) alongside a dwarfing gene (sd1) into Ranbir
Basmati. The molecular markers, specifically pTA 248,
xa13prom and h, which are associated with Xa21, xa13
and sd1 respectively, were utilized in the MABB
programme. Both foreground and background
selection methods were applied to pyramid the genes of
interest into the variety.
Crosses were conducted to integrate the BB resistance
genes and the dwarfing gene from Punjab Basmati 4
(Xa21, xa13 and sd1) into Ranbir Basmati. The MABB
programme progressed up to the BC3F6 generations. A
total of four semi-dwarf pyramided lines, namely SJBR
145-22, SJBR 145-34, SBJR-129-06 and SBJR-139-14
have been identified for subsequent field screening.
These pyramided lines exhibited excellent cooking
qualities and a pleasant aroma. Further evaluations of
these four lines for morpho-physiological and quality
traits indicated the potential donors for various rice
pre-breeding programmes.
Background: Uma is a high-yielding, popular red-kernelled rice variety of Kerala; however, the occurrence of BB disease often causes severe yield reductions in this cultivar. Host plant resistance based on multiple genes is the most effective measure to impart durable resistance. Hence, efforts were undertaken to intro...
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