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Stability analysis of yield component traits in 25 durum wheat(Triticum durum Desf.) genotypes under contrasting irrigationwater salinity

Stable straw and grain yield constituted a challenging objective for breeders to cope with environmentalchanges as salinity increase. For this purpose, an assessment of grain yield (GY) and yield componentsstability of 25 durum wheat genotypes was conducted in three semi-arid sites differing by their irrigationwater salinity: Echbika (S1, 6 dS m−1), Barrouta (S2, 12 dS m−1) and Sidi Bouzid (S3, 18 dS m−1) duringthree growing seasons (2010, 2011 and 2012). A significant average effect (P ≤ 0.05) of sites × genotypeswas observed for all measured parameters. GY was the most salinity affected trait showing decreaseof 20% in S2, and 50% in S3 compared to control conditions in S1. A significant linear regression existsbetween GY at control site S1 and GY at saline site S2 (R2= 0.79; P < 0.001) and saline site S3 (R2= 0.36;P < 0.001). Improved genotypes overstep landraces for all yield components. As a result, GY is about 30%higher for improved varieties. This trend was inverted for agronomic traits such as plant height, biomassand straw yield (SY). According to stability analysis, only the improved genotype Maali showed stabilityfor GY and SY in the contrasting salinity water irrigation sites. This genotype had a high average GY meanof 0.49 kg/m2(bi = 1.12; S2d = 0.84) and high SY of 0.70 kg/m2(bi = 0.85; S2d = 0.42). Our data suggest thatimproved genotypes could be used under contrasting salinity environment in arid area as well as breedingmaterials.

Authors: 
Zoubeir Chamekha, Chahine Karmousb, Sawsen Ayadia, Ali Sahlia, Zied Hammamia,Makram Belhaj Frajc, Nadhira Benaissaa, Youssef Trifaa, Hajer Slim-Amara
Year: 
2015
Publication type: 
Scientific Paper
Publication Source: 
Agricultural Water Management
Volume/Chapter/Issue: 
152
Page Number: 
1–6

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