نوع مقاله : مقاله پژوهشی
نویسندگان
1 موسسه تحقیقات خاک و آب، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران
2 محقق موسسه تحقیقات خاک و آب، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران
3 محقق پسادکترا، موسسه تحقیقات خاک و آب، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران
4 محقق پژوهشگاه ملی مهندسی ژنتیک و زیست فناوری ایران، تهران، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Soil salinity severely limits the production potential of high-yielding but sensitive wheat cultivars by compromising the critical stages of germination and seedling establishment. This study was conducted to evaluate the protective potential of seed bio-priming with Plant Growth-Promoting Rhizobacteria (PGPR), applied individually and in combination, to improve the germination and early growth of the sensitive wheat cultivar 'Qods' under salt stress. For this purpose, a factorial laboratory experiment was conducted in which wheat seeds were bio-primed with eight bacterial treatments (control, single and combined inoculations of three isolates of Azospirillum, Azotobacter, and Pseudomonas) and then subjected to three salinity levels (0, 6, and 14 dS/m). Key germination indices, morphological traits, and biomass accumulation were evaluated. The results showed that under severe salt stress (14 dS/m), while the growth of the control was severely suppressed, bio-priming with the triple bacterial consortium led to a remarkable improvement. Compared to the stressed control, this treatment increased the seedling vigor index by 32.2%, germination rate by 20.42%, coleoptile, and radicle length by 40.51% and 38.14% respectively, and root dry weight by 26.32%. A noteworthy finding was the unique performance of single inoculation with Pseudomonas in maintaining the highest root-to-shoot dry weight ratio under severe stress. These findings highlight the potential of using microbial consortia as a bio-ameliorant to enhance resistance and ensure crop establishment in salt-affected agricultural ecosystems.
کلیدواژهها [English]