Phenotyping new rapeseed lines based on multiple traits: Application of GT and GYT biplot analyses

Abstract

The selection based on multiple traits enhances the crop cultivars merit to farmers. In this regard, 19 breeding lines as well as two commercial cultivars were studied using a randomized complete block design (RCBD) with three replications in three locations during the 2020–2021 growing season. In this study, to identify the association among different traits and to select the best rapeseed lines based on multiple traits, genotype × trait (GT) and genotype × yield × trait (GYT) biplot analyses were used. The results showed that using GYT biplot is more efficient than GT biplot. Based on the GYT biplot and superiority index (SI), the breeding lines G16 and G18 were considered as superior genotypes in combination with the agronomical traits, that is, 1000‐seed weight, number of seeds per pod, number of pods per plant, number of lateral branches, plant height, and pod length with seed yield, which represents a genetic gain in rapeseed breeding program. Based on seed yield combination with phenological traits (early maturity), the breeding line G15 was selected as the best one. Moreover, the line G2 was defined as the superior one in combination of seed yield with pod length. The results indicated that there is a potential for simultaneous genetic improvement of the characteristics (i.e., plant height, number of seeds per pod, early maturity) in rapeseed. Generally, the graphical method of the GYT biplot represented an efficient and practical new way to recognize superior genotypes based on multiple traits in rapeseed breeding programs.

Growth, development and yield of safflower genotypes in response to environmental variations

“…The results of the biplot revealed that most of the studied yield-trait combinations positively correlated with each other mostly because they have the yield component. Similar findings were reported in literature (Karahan & Akgün, 2020;Kendal, 2020;Gholizadeh et al, 2023). Overall, genotypes Turkey and Kenya9819 were ranked as superior because they had aboveaverage yield*trait combinations.…”

Two types of biplots to integrate multi‐trial and multi‐trait information for genotype selection

“…Moreover, the GYT two‐way table can be displayed in a biplot, referred to as GYT biplot, which allows visualization of the genotypes' overall superiority as well as their trait profiles (strengths and weaknesses) (Yan & Fregeau‐Reid, 2018; Yan et al., 2019). The GYT procedure has already gained some popularity in multi‐trait selection of various crops (e.g., da Cruz et al., 2020; Faheem et al., 2023; Gholizadeh et al., 2023; Karahan & Akgün, 2020; Kendal, 2020; Ma et al., 2023; Merrick et al., 2020; Mohammadi, 2019; Peixoto et al., 2022; Xu et al., 2021). [Correction added on 3 April, after first online publication: missing text “For example … various crops” is added.…”

Comparative study of univariate and multivariate selection strategies based on an integrated approach applied to oilseed rape breeding

“…GT biplot methodology was used to investigate the interrelationships among different traits of winter oilseed rape genotypes (Dehghani et al., 2008). Recently, new oilseed rape lines were examined based on multiple traits using GT and GYT biplot analysis (Gholizadeh et al., 2022).…”