The wild species of rice, Oryza rufipogon, is a source of genetic variation for yield-enhancing traits and blast resistance. With the objective to genetically enhance the elite rice cultivar, ‘Samba Mahsuri’, a set of 192 BC₂F₂ and BC₂F₃ lines developed from O. rufipogon was characterized for yield-enhancing traits and blast resistance. The study revealed the presence of significant genetic variability and transgressive segregation for productive tillers, spikelets per panicle, and grain yield per plant. The study also identified several introgression lines superior to the recurrent parent for yield enhancing traits and blast resistance. Molecular characterization of 26 blast resistant lines identified multiple blast resistance genes in IL-136 [Pib, Pi9 (t), Pi54, Pi38, Pitp and Pi20(t)], IL-3 [Pib, Pi54, Pi38, Pitp and Pi20(t)], and IL-140 [Pib, Pi9(t), Pi54, Pi38, and Pitp]. Based on the performance of yield-enhancing traits and blast resistance, seven lines (IL-27, IL-28, IL-29, IL-72, IL-139, IL-158 and IL-171) showed merit. Estimation of the recovery of the recurrent parental genome by using 117 polymorphic SSR markers revealed that recurrent-parental genome recovery varied from 54.0 (IL-158) to 92.3% (IL-27). These promising, high-yielding introgression lines with multiple blast-resistance genes can serve as important genetic resources for yield and blast resistance improvement in rice, especially for the southern India.

稻的野生种Oryza rufipogon是提高产量和抗病性的遗传变异来源。为了遗传改良优良水稻品种'Samba Mahsuri'，从O. rufipogon开发了一套192 BC ₂ F ₂和BC ₂ F ₃品系以增产性状和抗稻瘟病性为特征。该研究表明，生产性分till，每穗小穗和每株植物的籽粒存在显着的遗传变异和侵略性分离。该研究还确定了几个在回归系上具有更高的基因渗入系，以提高产量和抗稻瘟病性。对26种高抗性品系的分子鉴定鉴定出IL-136 [ Pib，Pi 9（t），Pi54，Pi 38，Pitp和Pi 20（t）]，IL-3 [ Pib，Pi54，Pi 38，皮特和皮20（t）]和IL-140 [ Pib，Pi 9（t），Pi54，Pi38和Pitp ]。基于增产性状和抗瘟性的表现，七个系（IL-27，IL-28，IL-29，IL-72，IL-139，IL-158和IL-171）表现优异。通过使用117种多态性SSR标记估算父母亲的复发性基因组的回收率，发现父母亲的复发性基因组的回收率从54.0（IL-158）到92.3％（IL-27）不等。这些有前途的，具有多个抗稻瘟病基因的高产基因渗种系可以作为重要的遗传资源，用于提高水稻的产量和抗稻瘟病性，特别是对于印度南部。