Qualitative Assessment of Reaction Norm of New Cotton Lines (G. hirsutum L.)

Abstract

The qualitative side of reaction norm of eight promising cotton lines and of standard cultivar was studied. The lines were obtained by intra-specific and remote hybridization of the G. hirsutum L. species with some wild diploid species of the genus Gossypium L. The type of their dynamic regression (of their regression curve) and the structure of ecological environments in their dynamic rows were determined in order to characterize the reaction norm. The years of the study (2014-2017) appeared to be as different ecological environments. Four qualitative characters - seed cotton yield, boll weight, fiber length and fiber lint percentage were analyzed. It was found that in most cases the studied lines had reaction norm which considerably differed from that of the standard cultivar. The specificity of the lines reaction was less pronounced in its type (in ½ of cases) and stronger (in more than 7/8 of cases) in the structure of ecological environments in its dynamic row. By the index type of reaction line № 457 was closest to the standard cultivar, while line № 449 was furthest from it. For the individual characters, the line reaction norm was manifested to varying degrees, from very high - for the boll weight, where similarity with the standard cultivar was missing, to average - for the seed cotton yield, where for this character half of the lines were similar to the standard cultivar.