A large-scale whole-exome sequencing mutant resource for functional genomics in wheat

Area of Science:

• Plant Genomics
• Crop Science
• Mutagenesis

Background:

• Hexaploid wheat (Triticum aestivum) possesses a large genome, challenging functional genomics.
• A comprehensive mutant database is crucial for wheat genetic research and crop improvement.

Purpose of the Study:

• To construct a nearly saturated mutant database for hexaploid wheat using whole-exome sequencing.
• To analyze and compare mutation types induced by different mutagens (EMS, C-ion beams, γ-rays).
• To facilitate functional genomics studies and accelerate gene discovery in wheat.

Main Methods:

• Whole-exome sequencing of mutagenized hexaploid wheat lines.
• Ethyl methanesulfonate (EMS), carbon (C)-ion beam, and γ-ray mutagenesis.
• Mutation analysis, comparative genomics, and phenotypic screening.

Main Results:

• Generated a database of over 18 million mutations, covering a high percentage of high-confidence (96.7%) and low-confidence (70.5%) genes.
• γ-ray and C-ion beam mutagenesis induced a wider spectrum of variations compared to EMS.
• Successfully mapped a gene for a yellow-green leaf mutant and demonstrated the impact of gibberellic acid gene mutations on plant height.

Conclusions:

• The developed mutant database and repository are valuable resources for wheat functional genomics.
• Diverse mutation types can be induced by various mutagens, offering different research advantages.
• This resource accelerates gene discovery and aids in understanding wheat plant development and traits.