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Effects of Seed Bio-Priming by Purple Non-Sulfur Bacteria (PNSB) on the Root Development of Rice
Ranko Iwai1, Shunta Uchida1, Sayaka Yamaguchi1
1Department of Applied Life Science, Sojo University, 4-22-1 Ikeda, Nishiku, Kumamoto 860-0082, Japan.
Microorganisms
|November 11, 2022
Summary
Seed bio-priming with purple non-sulfur bacteria (PNSB) significantly boosted rice grain yields and improved root development. These benefits are linked to cellular components like lipopolysaccharide (LPS), suggesting a novel approach to enhance crop productivity.
Area of Science:
- Agricultural Science
- Microbiology
- Plant Science
Background:
- Purple non-sulfur bacteria (PNSB) are known for their beneficial effects on plant growth.
- Seed bio-priming is a technique used to enhance seed germination and plant vigor.
- Understanding the specific components of PNSB responsible for these effects is crucial for agricultural applications.
Purpose of the Study:
- To evaluate the impact of seed bio-priming with PNSB on rice grain productivity.
- To assess the effects of PNSB seed bio-priming on rice root development.
- To identify the active cellular components of PNSB responsible for the observed benefits.
Main Methods:
- Field studies were conducted to measure grain productivity of rice seeds bio-primed with two PNSB strains (Rhodopseudomonas sp. Tsuru2 and Rhodobacter sp. Tsuru3).
- Laboratory experiments using pot cultivation assessed root development (total root length, surface area, tips, forks) using image analysis (WinRhizo).
- Experiments with dead PNSB cells and purified lipopolysaccharide (LPS) were performed to determine the active component.
Main Results:
- PNSB bio-priming significantly increased rice grain productivity compared to the control group.
- Bio-priming with PNSB strains Tsuru2 and Tsuru3 enhanced key root development parameters.
- Seed priming with both live and dead PNSB cells, as well as PNSB-derived LPS, effectively improved root growth, indicating LPS as a key active component.
Conclusions:
- Seed bio-priming with PNSB is an effective strategy to improve rice grain yield and root architecture.
- The beneficial effects of PNSB bio-priming are mediated by cellular components, notably lipopolysaccharide (LPS).
- This research supports the use of PNSB or their components as bio-fertilizers to enhance rice cultivation.
