Document Type : Research Paper

Authors

• Ramtin Pakzad ¹
• Maryam Nasr Esfahani ²
• roya karamian ³
• jalal soltani ⁴

¹ biology department, Sciences faculty, lorestan university, khorramabd Iran

² lorestan university

³ faculty of sciences Buali universiry

⁴ Buali university

Abstract

In order to investigate the effect of salinity stress on the growth factors, proline and auxin contents of two cultivars of rainfed wheat (Triticum aestivum L.), the wheat seeds were pretreated with Bacillus subtilis POE26, then the seedlings were planted in pots in controlled laboratory conditions and were irrigated with Hoagland nutrient solution containing 6 different Sodium chloride (NaCl)levels. The plants were harvested at the 4 leaves stage and growth factors and proline and auxin contents were assessed. The results showed a significant difference in the growth of aerial parts between pretreated and non-pretreated plants in different salinity levels. The bacteria increased the germination of seeds only at the high NaCl concentration. Pretreatment of wheat seeds with bacteria increased the auxin content of the plants. The role of bacteria in changing root length was without the involvement of proline. In conclusion, pretreatment of wheat seeds with auxin producing bacteria altered the growth factors, and especially increased the leaf area under salinity stress.

Keywords

• Wheat
• Salinity stress
• Endophytic bacteria
• Growth factors
• Bacillus subtilis POE26

Main Subjects

• Physiology