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Protocol for evaluating salt and alkaline tolerance in maize seedlings using a sand-bed germination assay
Jiaxin Yang1, Ye Wang1, Yajun Zhang1
1CIMMYT-China Shandong Maize and Wheat Research Center, College of Agronomy, Shandong Agricultural University, Tai'an 271018, China.
STAR Protocols
|May 28, 2026
Summary
This study introduces a new method to test how well maize seedlings tolerate salt and alkaline conditions. The protocol allows for large-scale, reproducible screening of maize varieties for improved crop resilience.
Area of Science:
- Agricultural Science
- Plant Biology
- Genetics
Background:
- Maize (Zea mays L.) is a vital global crop.
- Soil salinity and alkalinity are major abiotic stresses limiting maize productivity.
- Developing stress-tolerant maize varieties is crucial for food security.
Purpose of the Study:
- To present a standardized protocol for evaluating salt and alkaline tolerance in maize seedlings.
- To enable independent and concurrent assessment of both stresses.
- To facilitate reproducible, large-scale germplasm screening.
Main Methods:
- Development of a controlled sand-bed germination assay.
- Preparation of standardized salt and alkaline stress solutions.
- Application of stresses independently or in combination.
- Measurement of multiple phenotypic traits.
- Germplasm ranking using a comprehensive membership function scoring system.
Main Results:
- The protocol allows for precise and reproducible evaluation of maize seedling tolerance to salt and alkaline stresses.
- Independent and combined stress application can be effectively managed.
- A scoring system enables efficient ranking of maize germplasm based on stress tolerance.
Conclusions:
- This protocol provides a robust framework for screening maize germplasm for enhanced salt and alkaline tolerance.
- It supports the breeding of more resilient maize varieties for challenging agricultural environments.
- The method is suitable for large-scale, high-throughput phenotyping.
