Influences of traits associations for essential oil yield stability in multi-environment trials of vetiver (Chrysopogon zizanioides L. Roberty)

Vetiver is a perennial aromatic grass with thin essential oil-rich roots. The current investigation was conducted at the CSIR-CIMAP, Lucknow (India), on the eighty distinct vetiver lines. The experiment was conducted over three consecutive years, 2017-18, 2018-19, and 2019-20 using a randomized complete block design with three replications. The genotype (G) and genotype x environment (GE) interactions were found to be highly significant in this study, indicating that GE had a considerable impact on genotype essential oil yield. E1, E2, and E3 were all connected as part of a single group, and E3 also joined them. The genotypes, namely Gv5, Gv6, and Gv3, were polygonally stable and performed well in essential oil yield in a GGE biplot evaluation of environmental interrelationships. Because they are all arranged in a concentric circle around the center, the genotypes Gv5, Gv6, and Gv3 were all extraordinarily stable and favorable for essential oil yield. The purple inflorescence of vetiver was related to Khusimol rich light brown colour essential oil, while the greenish inflorescence of vetiver was associated with Khusilal rich whitish colour essential oil. These marker associations will aid vetiver breeders in selecting genotypes with high essential yields. These genotypes could be used to create new vetiver cultivars in the future.