Induction of rice mutations by high hydrostatic pressure

Area of Science:

• Plant Science
• Genetics
• Biotechnology

Background:

• High hydrostatic pressure (HHP) is an extreme physical factor impacting DNA, RNA, and protein synthesis, and mutagenesis in microorganisms.
• Previous research demonstrated HHP (25-100 MPa for 12h) affects rice seed germination, viability, cold stress tolerance, and gene expression.

Purpose of the Study:

• To investigate the mutagenic effects of HHP on rice (Oryza sativa L.).
• To determine the influence of HHP strength and presoaking time on mutation efficiency in rice.

Main Methods:

• Rice seeds were exposed to varying HHP levels (25, 50, 75, 100 MPa) for 12 hours.
• The Comet assay was employed to detect DNA strand breakage in germinating rice seeds.

Main Results:

• HHP treatment (25-100 MPa for 12h) effectively induced genetic variation in rice plants.
• Mutation efficiency was influenced by both HHP strength and presoaking duration.
• The Comet assay confirmed HHP-induced DNA strand breakage, suggesting a mechanism for mutation.

Conclusions:

• High hydrostatic pressure is a viable physical mutagen for rice.
• HHP treatment presents a promising avenue for enhancing genetic diversity in rice breeding programs.