Grain quality traits in triticale influenced by field salinity stress

摘要

The effect of field salinity stress on the grain quality-related traits in eighteen triticale lines comprising 9 doubled haploid (DH) and 9 corresponding advanced lines (F8) and two bread wheat cultivars was investigated. Plant materials were grown in two separate experiments under salt stressed and non-stressed conditions in the field in 2008-2009. Grain quality-related traits including dry gluten content, gliadin, glutenin, gliadin/glutenin ratio, sodium dodecyl sulphate (SDS) sedimentation test, protein content, protein yield, carbohydrate content, ash content and test weight were evaluated. Results of combined analysis of variance showed strong influence of environment (saline and normal), genotype and genotype × environment interactions (G × E) on the studied traits with a few exceptions. Protein per hectar was dependent to a greater extent upon grain yield rather than grain protein content under both saline and normal conditions. Grain protein yield decreased when salinity treatment reduced grain yield, even though grain protein percentage increased in both triticale and wheat. Gluten and protein contents were positivly and significantly affected by salinity stress. Salinity casued a decrease of SDS-sedimentation volume and an increase of gliadin/glutenin ratio, both diminishing baking quality. DH line number 2 produced the highest grain protein yield of 1024.1 kg ha-1 and 736.0 kg ha-1 under non-stress and salt stress conditions, respectively. It is concluded that although salinity enhances quantity of protein, deteriorates quality of protein in the triticale and wheat grains.