Genetic analysis of introgression lines of Oryza rufipogon for improvement of low phosphorous tolerance in indica rice

Soil phosphorus (P) deficiency is one of the major challenges for rice cultivation. The present study was carried out under low soil P condition (available P, < 2 kg ha-1) to genetic variability, correlation, path and principal component analysis (PCA) in a set 40 introgression lines derived from Samba Mahsuri (Oryza sativa ssp. indica) × Oryza rufipogon. High genotypic coefficient variation phenotypic recorded productive tillers (PT), seed weight (SW), grain yield (GY). heritability coupled with high advance plant height (PH), PT, SW, number spikelets/panicle (SPP), spikelet fertility, GY. Correlation revealed that had significant positive association PH, panicle length, SPP, SW. Regression mainly influenced by PT This confirmed analysis, wherein SW exerted highest direct effect on yield. PCA first two PCs contribute maximum which together accounted 60% total variability. traits contributed load/variance Thus, selection greater higher would be most appropriate strategy improvement rice. Cluster grouped along checks into three clusters. Overall, pattern variability tolerance lines. further helps designing breeding strategies cultivars tolerance.