Abstracts |
Quality of the seed (oil and mucilage), as the main product of flaxseed, may well be improved by arbuscular mycorrhizal fungi and phosphate solubilizing bacteria in a wide range of water supply conditions. To evaluate compensation of deficit irrigation-induced flaxseed yields (fatty acids and mucilage components), a 2-year factorial experiment was conducted based on randomized complete block design at Urmia University. Treatments included arbuscular mycorrhizal fungi species (non-inoculated, Funneliformis mosseae, and Rhizophagus intraradices), phosphate solubilizing bacteria (Pseudomonas putida P13 and non-bacteria), and three irrigation regimes (irrigation after 60, 120, and 180 mm of evaporation from Class A pan) arranged in three replications. The highest percentages of oil (32.24%) and mucilage (8.09%) were obtained from irrigation after 120 mm of evaporation as the severe stress. Concerning the flax seed oil compositions, the highest total unsaturated fatty acids (83.98%) and the lowest total saturated fatty acids (9.24%) were observed in irrigation after 120 mm of evaporation. Despite the inconsiderable reduction of total saturated fatty acids, α-linolenic, linoleic, and oleic acid contents increased by mycorrhizal and/or bacterial treatments, contributing to the balance of total unsaturated/saturated fatty acids. Regarding the seed mucilage components, the percentages of glucose, galactose, arabinose, and rhamnose significantly increased with lengthening the irrigation interval. In conclusion, the highest quality and quantity of oil and mucilage were significantly yielded under moderate stress (irrigation after 120 mm of evaporation). The flaxseed plant performance was partially enhanced by microbial dual inoculations as well as mycorrhizal and/or phosphate solubilizing bacteria. |