Protocol for ethyl methanesulphonate (EMS) mutagenesis application in rice

Area of Science:

• Plant Science
• Genetics
• Agricultural Science

Background:

• Ethyl methanesulfonate (EMS) is a chemical mutagen used to induce mutations and create novel genetic variations in plants.
• While EMS mutagenesis is established in various crops, a standardized protocol for its application on presoaked rice seeds is lacking.
• This study addresses the need for an optimized and reproducible method for EMS mutagenesis in rice.

Purpose of the Study:

• To establish a standardized protocol for ethyl methanesulfonate (EMS) mutagenesis in rice seeds.
• To determine optimal parameters for EMS application, including presoaking duration, EMS concentration, and exposure time.
• To provide a user-friendly protocol for researchers to generate a sufficient number of mutant rice plants.

Main Methods:

• Evaluated effects of four presoaking durations (0-24 hours), four EMS concentrations (0.0%-2.0%), and four EMS exposure periods (6-48 hours).
• Assessed germination rate, seedling growth parameters (plumula, radicle, shoot, root length), survival rate, and Lethal Dose 50 (LD50).
• Conducted two experimental studies to validate the parameters for EMS mutagenesis in rice.

Main Results:

• A 12-hour presoaking duration, 0.5% EMS concentration, and 6-hour exposure period yielded the optimal number of mutant plants.
• These conditions were identified as the most effective for generating a sufficient quantity of viable mutant rice individuals.
• Germination, seedling survival, and growth metrics were evaluated to determine the most effective treatment parameters.

Conclusions:

• A standardized protocol for EMS mutagenesis in rice seeds has been established, incorporating optimized parameters.
• The recommended protocol involves 12-hour presoaking, 0.5% EMS for 6 hours, followed by 6-hour washing and 72-hour drying at 38°C.
• This user-friendly protocol aims to facilitate efficient mutant generation for rice research.