Line × Tester Analysis for Yield and Quality Traits under Salinity Stress in Cotton (Gossypium barbadense L.)

Document Type : Original Article

Authors

1 Department of Agronomy, Faculty of Agriculture, Assiut University, Assiut, Egypt

2 Cotton Research Institute, Agricultural Research Center, Giz, Egypt

Abstract

The issue of salinity tolerance in crops has received a great amount of attention recently in Egypt, especially under the climate change phenomenon. The main objective of this experiment was to study the gene action that controls yield and quality traits of Egyptian cotton under normal and saline soil. Nine lines were crossed to three testers in a line × tester mating design. The 27 crosses and their parents were evaluated under normal and saline soil conditions in the seasons of 2018 and 2019 using a randomized complete block design with three replicates. Both additive (s2A) and dominance (s2D) variances were higher under normal soil than under salinity stress conditions for all the analyzed characteristics. Under normal soil, the ratio s2A/s2D was less than unity for seed cotton yield/plant (SCY/p), number of bolls (NB/p), number of seeds (NS/b), boll weight (BW), lint yield (LY/p), and lint%. s2D was not significant for seed index (SI), lint index (LI), days to the first flower (DFF), plant height (PH), and upper half-mean length (UHML). Under normal soil and based on the mean performance the cross (Giza90 × Aus×Giza85) × Giza95 was the best one for SCY/p, LY/p, NB/p, BW, SI and NS/b, and Ashmouni × Giza90 × Aus×Giza83 for lint%, Dandara× Giza90 × Aus×Giza83 for LI, Ashmouni × Giza90 × Aus×Giza83 for DFF, Giza85×Giza95 for UHML. Giza95, Giza90 and Giza90 × Aus×Giza83 were the best combiners in all the analyzed traits. These crosses can be used to develop new lines for the two environments.

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