Stability Analysis for Seed Yield of Linseed (Linum Usitatissimum) Genotype in Saline Affected Soils of South-Western Coastal Region of Bangladesh

Abstract

A vast area of cultivable lands in saline affected coastal region of South-Western Bangladesh remains fallow during Rabi (winter) season due to non-availability of saline tolerant crop species or varieties. Linseed (Linum usitatissimum) is known as a medium salt tolerant crop with diverse uses. The crop may be a good choice to utilize these saline prone lands. For this purpose a salt tolerant high yielding variety is essential. With this view in mind, a multi-environmental trial of ten linseed genotypes was conducted in saline soils of four locations in this coastal region during Rabi (winter) season of 2020-21, 2021-22 and 2022-23 to identify superior genotypes based on their yield performance, stability and adaptability. The AMMI model ANOVA revealed that the main effects of genotypes (G), environment (E) and GE interaction effects explain 83.95, 1.07 and 12.02% of seed yield variation, respectively. The GE interaction was further subdivided into 9 IPCAs of which first 6 were significant, and the first two IPCAs explained 82.3% of total sum of square where IPCA 1 explained 67.60% and IPCA 2 14.70%. Mean comparison showed that mean seed yield of ten genotypes varied from 625 to 1345 kg ha-1 and that of 12 environments varied from 937-1050 kg h-1 with a grand mean of 1000 kg ha-1. AMMI 1, AMMI 2 and GGE biplot analyses depicted that the highest yielder genotype was G2 followed by G6, G1 and G4. The lowest yielding genotype was G9 followed by G10, G5 and G3. The most stable genotype was G2 followed by G7, G9, G1 and G4, which were widely accepted to almost all environments. The ASV, EV, CV, SIPC and yield index analyses revealed that genotypes G2, G4 and G6 were found to be superior genotypes in seed yield and consistently demonstrating high mean performance across tested environments. Considering the results of biplot analyses and stability parameters like ASV, SIPC, CV, and EV, genotypes G1, G2, G4 and G6 were identified as superior genotypes. The genotypes, G6 exhibited high seed yield, wide adaptation and excellent stable performance over all four tested locations. Thus BD-10698 (G6) can be selected as a variety for cultivation in the saline affected soils of South-Western coastal region of Bangladesh. Genotypes BD-10708 (G2) and Lin-1403 (G4) showed excellent yield performance but medium stability, while Lin-1203 (G9) showed excellent stability but low yield performance. So, BD-10708, Lin-1403 and Lin-1203 can be utilized to develop salt tolerant linseed variety through required breeding program.