Yardlong Bean Line Selection Under a Drought Condition Based on Genotype x Yield x Trait (GYT) Biplot Analysis
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Abstract
The objective of this research was to compare and select 25 genotypes of yardlong bean lines/cultivars grown under a drought condition based on the combined effects of yield and important horticultural traits using the biplots analysis method of genotype x yield x trait (GYT). The 25 yardlong bean genotypes were laid out in randomized complete block design (RCBD) with 3 replications. The results showed that genotypes were different in leaf greenness and pod weight (p < 0.05), where the days to first anthesis, pod length, pod width, number of seeds per pod and yield per plant were not different (p > 0.05) among the genotypes. The GYT principal component analysis revealed that components 1 and 2 (PC1 and PC2) accounted for 94.5 percent of the total variance of the principal components. The results of the GYT biplot analysis for ranking of genotypes according to their prominences for selection revealed that the genotypes ranked for outstanding yield along with other traits in ranks 1 – 10 (with positive GYT scores) were G1 (No.33P), G11 (P4T8), G2 (BP2), G10 (No.33G), G25 (Nawa3), G13 (Suwan), G23 (No.38P), G3 (P10T26), G14 (No.19G) and G4 (BP1), respectively. These genotypes should be considered in selection for planting in drought conditions because they had outstanding yields along with important horticultural characteristics, including days to first anthesis, leaf greenness, pod length, pod width and number of seeds per pod.
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