Genotype by Environment Interactions on Cotton Fiber Traits and Their Implications on Variety Recommendation

Abstract

The objective of this study was to evaluate cotton fiber quality traits across diverse environments. This could lead to the selection of the best environment for cotton cultivations and the best adapted commercial cultivars. For this reason four main cotton regions were chosen as different environments: Thessaly, Thrace, Macedonia and Sterea Ellas. Five of the most commercial upland cotton cultivars (DP332, DP377, ST402, CELIA and ELSA) were used for evaluation of their fiber quality traits. Each cultivar was sown in 10 different fields (in order to exploit and evaluate different soil types) in each of the above mentioned regions and (in total) 200 fields were used in total. Four samples from each field were collected in order to analyze fiber quality traits: micronaire, maturity index (%), fiber length as the upper half mean length (mm), fiber strength (gram/tex), uniformity index (%), fiber elongation, Cultivation regions must also be selected in a way that they could promote fiber traits, in order to ensure the highest fiber quality. Cotton fiber quality traits were affected differently from environmental fluctuations, showing that the ranking of cultivars according to environmental fluctuations is important, if proper breeding methods should be applied. Each trait is affected differently by environmental fluctuations and requires precise knowledge of the degree of inheritance i.e., as to how much qualitative or quantitative is the trait, in order to choose and apply the proper breeding method.

Fiber Quality Characteristics of Cotton (Gossypium hirsutum L.) in Main Production Areas of Aegean Region

“…). Reflectance (Rd) and yellowness (+b) affected by both genotype and environment are two important factors that determine the fiber color grade in cotton [38]. The reflectance scale is between +40 (darker) and +85 (lighter/brighter) [25].…”

“…The reflectance scale is between +40 (darker) and +85 (lighter/brighter) [25]. In studies from different regions, reflectance values changed from 72.28 to 74.50 in Southeastern Anatolia of Türkiye [38], and from 71.5 to 73.3 in Thrace, Macedonia, Central Greece and Thessaly of Greece [14]. Our results indicated that Rd values fluctuated from 69.62-71.0 (Great Meander and Bakırçay in 2020) to 73.74 (Söke in 2020)-73.82 (Bakırçay in 2019) (Fig.…”

Correlations between Cotton Characteristics in Greek Multi-environments

“…Four main cotton-production Greek regions were selected as different environments (Greveniotis and Sioki, 2017), i.e. Thessaly, Sterea Ellas, Macedonia and Thrace.…”

“…Upland cotton (Gossypium hirsutum L.), is one of the main cultivations in Greece, with four main regions consisting a mega-environment (Baxevanos et al, 2006;2013;Greveniotis and Sioki, 2017). Improvement in fiber quality is the primary objective for cotton breeders, coping with the lack of reliable methods to measure fiber characteristics.…”