Alleviating Soybean Salt Stress via Suaeda salsa Intercropping: Roles of Desalinization and Root Interactions

Area of Science:

• Agricultural Science
• Plant Physiology
• Environmental Science

Background:

• Halophyte-based intercropping can mitigate salt stress in glycophytes via desalinization.
• The contribution of root interactions to the sustainability of such systems is often underestimated.

Purpose of the Study:

• To investigate the impact of root interaction modes on soybean (Glycine max) salt tolerance when intercropped with the halophyte Suaeda salsa.
• To differentiate the effects of root interactions versus desalinization on soybean performance under salt stress.

Main Methods:

• Soybean was intercropped with Suaeda salsa under three root separation conditions: plastic sheet (PL), nylon mesh (NL), and no separation (NS).
• Soil and plant tissues were analyzed for ion content (Na+, Cl-), reactive oxygen species (ROS) levels, and antioxidant enzyme activities.
• Biomass and nutrient uptake (Ca, Mg) were quantified.

Main Results:

• Desalinization reduced Na+ and Cl- in soil and soybean but increased ROS and nutrient competition.
• Root interactions significantly increased soybean biomass by 80% and enhanced antioxidant capacity by upregulating enzymes and non-enzymatic antioxidants.
• Root interactions also improved uptake of essential nutrients like calcium and magnesium.

Conclusions:

• Root interactions play a crucial role in enhancing soybean salt tolerance, primarily through improved antioxidant defense mechanisms.
• Intercropping soybean with Suaeda salsa, with appropriate water and nutrient management, offers a sustainable approach for cultivation in saline soils.