Improving Nutrient Bioavailability in Wheat by Reducing Antinutritional Factors

Micronutrient deficiencies—often referred to as hidden hunger—affect over two billion people worldwide, with iron and zinc deficiencies among the most prevalent. Wheat is a major global staple crop, yet its nutritional value is limited by the presence of phytic acid, a naturally occurring antinutrient that binds essential minerals and reduces their bioavailability in the human diet.

This PhD project aims to improve the nutritional quality of wheat grain by reducing phytic acid content while maintaining plant performance and yield. The work will explore how the genetic redundancy of bread wheat’s hexaploid genome can be exploited to fine tune, rather than eliminate, key genes involved in phytic acid biosynthesis and storage. This strategy offers a novel route to enhancing micronutrient bioavailability with minimal negative effects on plant growth.

Research Objectives

The successful candidate will:

• Investigate the genetic regulation of phytic acid accumulation in wheat grain

• Develop and characterise wheat lines with partial loss-of-function mutations in key phytic acid pathway genes (e.g. ITPK, IPK1, MRP/ABCC transporters)

• Assess the impact of reduced antinutrient levels on:

o Grain phytic acid content

o Micronutrient concentration (iron and zinc)

o Seed germination, yield-related traits, and overall plant fitness

• Identify genetic strategies that reduce antinutrient content without compromising agronomic performance

Methodology

The project will combine genetics, molecular biology, and plant phenotyping, with training provided as needed. Core methodologies may include:

• Marker-assisted selection using mutant wheat populations

• Analysis of gene dosage and enzyme activity effects

• Seed composition analysis (phytic acid and mineral content)

• Glasshouse and/or field-based phenotyping

• Statistical analysis of genotype–phenotype relationships

The project is well suited to applicants interested in translational plant science, with outcomes relevant to crop breeding, global nutrition, and sustainable agriculture.

Training and Research Environment

The PhD student will join a supportive research group working at the interface of crop genetics, nutrition, and plant physiology. The project provides excellent training in:

• Wheat functional genomics

• Applied plant breeding approaches

• Nutritional quality assessment

• Independent research design and data analysis

The work will generate valuable mutant resources and preliminary data suitable for future grant applications and academic or industry careers.