Yield stability and agronomical performance of inland swamp rice lines developed using molecular breeding

Abstract

Yield stability of rice varieties in diverse locations is an important aspect in a varietal recommendation to ensure better economic benefits for farmers. Multi-location trials in different locations or seasons will identify consistently high-performing varieties. This study aimed to test the yield stability of selected promising lines previously developed by means of Marker-assisted Breeding. Field trials were conducted in three different types of swampland locations: Lampung, South Kalimantan and Riau. The experiments were carried out in a randomized complete block design with three replications. A total of 15 selected rice lines were evaluated. Seedlings were transplanted to 2 m × 5 m plots with 20 cm × 20 cm planting distance. Yield stability was estimated using various analyses that measure coefficient of variability (Cvi), coefficient of regression (bi), deviation parameter (δ2), coefficient determination (Ri2) and AMMI biplot. Combined analysis of variance showed that line effect (G), environmental effect (E), and G × E interaction were statistically significant different. Using CVi25% and bi<1 threshold followed by AMMI biplot analyses, four lines (line number 1, 4, 6 and 11) were classified as having broad stability. Five lines (line number 5, 12, 13, 14 and 15) showed less yield stability but had better adaptation in tidal swamp environment. The other two lines (line number 3 and 7) showed a greater yield in the coastal swamp area, suggesting their potential as adapted lines suitable to this swampy environment.