Dhatt, K. K.Harsimrat Kaur2019-10-042019-10-042019http://krishikosh.egranth.ac.in/handle/1/5810130230The present investigation entitled “Genotype × environment interactions for quantitative traits in gladiolus” was undertaken in the experimental field area of Floriculture and Landscaping, Punjab Agricultural University, Ludhiana, during 2018-2019. Eight genotypes of gladiolus were planted on six different dates i.e. 15th October, 10th December, 30th December, 20th January, 10th February and 28th February. The analysis of variance was conducted as per randomized block design to assess the level of variability and phenotypic stability for each trait among the genotypes. Mean square values for genotypes and environments were found significant. The planting on 15th October gave the best results for all the genotypes. Variety Novalux (6.07 days) took minimum number of days from bud initiation to flowering when planted on 20th January. Variety Punjab Pink Elegance planted on 15th October resulted into tallest plants (99.28 cm), longest spikes (85.67 cm), maximum number of florets per spike (15.62), maximum vase life (15.13 days) and long flowering duration (19.25 days). Variety Punjab Glance produced bigger florets (7.93 cm) and maximum number of corms (1.73), and also resulted in maximum corm weight (83.43 g/corm). Variety Punjab Pink Elegance possessed high mean, regression coefficient unity (bi = 1) for days to bud initiation (73.21 days), plant height (76.33 cm), spike length (64.55 cm), number of florets per spike (12.79) and Punjab Glance had high means and regression coefficient bi=1 for days to sprouting (21.26 days), corm diameter (3.60 cm) which represents average stability for these parameters and it is well adapted to all the environments. Hence variety Punjab Pink Elegance and variety Punjab Glance proved to be the best performing and the most stable varieties among the eight genotypes.ennullThesis