Abstract:
This study was focused to study the adaptability and stability of four newly developed rice lines i.e.,
Bw19-1410, Bw19-1458, Bw19-1468 and Bw19-1377 in RRRDC, Bombuwela with four
recommended popular rice varieties i.e., Bg 359, At 362 and Bw 367 across Yala 2021, Maha
2021/2022 and Yala 2022 cropping seasons. AMMI and Biplot analysis of PB Tool 1.4 software
showed the genetic and environment (GE) interaction for the grain yield. Based on the AMMI model,
Bw 19-1468 is the most adaptable to all seasons which the mean closer to the grand mean (3.12 t/ha)
and the PCA scores nearly zero. Further, Won where biplot graph give us which genotypes are doing
well in which environments. Bw 19-1377 had given higher yield than At 362 in Yala 2021 but At 362
has given more yield than Bw 19-1458 in Yala 2022. As well as Bw 19-1377 has given more yield in
Yala 2021 and Maha 2021/22 than Bw 19-1410 grown in same seasons. Although such an ideal
genotype may not exist in reality, we consider genotype is more desirable if it is closer to the ideal
genotype. Therefore, At 362 which fell into the center of the concentric circles, were most favorable
genotypes in terms of higher yield ability and stability, compared with the rest of the genotypes. The
performance of Bw 19-1377 was the most variable (least stable), whereas Bw 367 and At 362 were
highly stable with high grain yield. The GGE biplot way of measuring representativeness is to define
an average environment and use it as a reference or benchmark. The average environment is
indicated by small circle of the figure. Therefore, Maha 2021/22 was the most desirable test
environment followed by Yala 2021 and Yala 2022. Considering all facts that, AMMI and GGE biplot
analysis is an effective tool for Gene by Environment data analysis to achieve understandings about
the target environment, the test environments, and the genotypes stability analysis. According to the
analysis, At 362 is the most stable over seasons and Maha 2021/22 was the most desirable
environment for these lines/varieties.
