Genetic analysis, yield and yield stability of rice (Oryza sativa L.) near isogenic lines under irrigated environment

Abstract

Rice being a staple food crop for more than half of the world’s population is very important for global food security. Rice is cultivated on wide range of ecosystems varying in hydrological conditions. Irrigated rice accounts for more than 50% of total area globally and contributes significantly to global food security. Genotype and environment are the main factors influencing grain yield in irrigated rice production. The present study was conducted to study genotype x environment interaction and yield performance using eight near isogenic lines (NILs) developed from IR20/CT9993//IR20 for grain yield and its stability under irrigated environment over different seasons. Graphical genotyping of the eight NILs was performed using microsatellite (SSR) markers. The results showed that NILs #172 and #212 are high yielding but unstable across seasons. NILs #65 and #297 are stable across seasons, while NIL #65 is low yielding, NIL #297 is moderate yielder. NIL #297 had 57% of recurrent parent genome in the introgressed QTL region. NIL #297 may be useful in breeding for rice yield improvement.