Microsphere stem blockage as a screen for nitrogen-fixation drought tolerance in soybean.
Deepti Pradhan1, Diana Bertin2, Thomas R Sinclair1
1Crop and Soil Sciences Department, North Carolina State University, Raleigh, North Carolina, USA.
Physiologia Plantarum
|November 18, 2020
Summary
Scientists developed a new method to screen soybean plants for drought tolerance in nitrogen fixation. This method uses microspheres to identify plants with xylem traits linked to better drought resilience, aiding breeding efforts.
Area of Science:
- Agricultural Science
- Plant Physiology
- Genetics
Background:
- Soybean symbiotic nitrogen fixation declines with soil drying.
- Breeding for drought-tolerant soybean lines is challenging due to difficult phenotyping.
- Xylem-vessel diameter may influence nitrogen fixation drought tolerance.
Purpose of the Study:
- To explore a new screening method for nitrogen fixation drought tolerance in soybean.
- To investigate the relationship between xylem-vessel diameter and nitrogen fixation drought tolerance.
- To identify soybean genotypes with enhanced drought resilience.
Main Methods:
- Exposing de-rooted soybean shoots to microspheres to assess xylem blockage.
- Measuring transpiration rate decrease as an indicator of xylem blockage.
- Correlating microsphere-induced transpiration changes with nitrogen fixation sensitivity to drought.
Main Results:
- A significant correlation (R² = 0.68) was found between reduced transpiration and increased nitrogen fixation drought sensitivity.
- The microsphere screen identified soybean lines with minimal transpiration blockage.
- Nearly half of previously identified drought-tolerant lines showed minimal blockage in the screen.
Conclusions:
- The microsphere-based screen shows potential for identifying soybean genotypes with nitrogen fixation drought tolerance.
- This method could streamline breeding programs for drought-resilient soybean varieties.
- Xylem traits appear to be a viable indicator for nitrogen fixation drought tolerance.
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