Author(s):

Parashuram Patroti, J Suresh, Shilpa Parashuram and MS Madhav

Abstract: Globally, blast incited by Magnaporthe oryzae forms major fungal diseases that can cause severe loss in yield to the extent of 70-80% in various rice ecosystems. Marker assisted backcross breeding approach was employed to incorporate blast resistance genes viz., Pi1, Pi2 and Pi54, from the donor lines BPT/lac/tetep and B95-1/A51 into blast susceptible otherwise superior cultivar Improved Samba Mahsuri. Foreground selection coupled with stringent phenotypic selection lead to the identification of 15 superior BC₂F₂ plants homozygous for three genes. Agro-morphological evaluation of the pyramided lines revealed that three of the selections viz., ISM10-15-101, ISM10-15-119 and ISM10-15-154 showed significant increase in no. of filled grains per panicle (30.22%) and yield (24.23%). BC₂F_2:3 derived lines, varied in their disease reaction to DRR isolates. Three of the Pi1+Pi2+Pi54 pyramided lines showed complete resistance to mixture of virulent races under artificial inoculation as well as in UBN test locations.

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