Genomics-assisted breeding for drought tolerance in chickpea

Area of Science:

• Plant Genomics
• Crop Science
• Agricultural Biotechnology

Background:

• Terminal drought poses a significant threat to chickpea (Cicer arietinum L.) yields, causing over 50% production losses.
• Genomic-assisted breeding offers a pathway to accelerate crop improvement for enhanced stress tolerance.

Purpose of the Study:

• To accelerate genetic understanding and crop improvement in chickpea through genomics-assisted breeding.
• To develop genomic resources and identify genetic regions associated with drought tolerance.

Main Methods:

• Assembled a draft genome sequence for the CDC Frontier chickpea variety.
• Developed large-scale genomic resources including SSRs, SNPs, and transcriptome assemblies.
• Utilized linkage mapping and marker-assisted backcrossing to introgress drought tolerance QTLs into elite varieties.

Main Results:

• Assembled 544.73Mb of sequence data, capturing 73.8% of the chickpea genome.
• Identified and introgressed a genomic region for drought tolerance into three leading chickpea varieties.
• Marker-assisted backcrossing lines demonstrated 10-24% higher yield compared to recurrent parents.

Conclusions:

• Advances in genomics and genomics-assisted breeding accelerate precision and efficiency in developing stress-tolerant chickpea.
• The developed genomic resources and introgression lines are valuable for future chickpea breeding programs.
• Genomic selection and novel mapping populations will further enhance drought tolerance breeding in chickpea.