Characterising root trait variability in chickpea (Cicer arietinum L.) germplasm

Area of Science:

• Agricultural Science
• Plant Biology
• Genetics

Background:

• Chickpea (Cicer arietinum L.) production faces challenges from climate change, impacting yield stability.
• Developing chickpea varieties with enhanced root systems is crucial for efficient resource acquisition and stress adaptation.
• Understanding root trait variability is essential for breeding climate-resilient chickpea germplasm.

Purpose of the Study:

• To characterize the variability in root architectural traits within a core collection of 270 chickpea genotypes.
• To identify key root traits and their correlations for breeding improved chickpea varieties.
• To group chickpea genotypes based on root trait variation for targeted breeding and research.

Main Methods:

• Utilized a semi-hydroponic phenotyping system to assess root traits in 270 chickpea genotypes.
• Characterized 30 root-related traits, selecting 17 with high coefficients of variation (≥0.3).
• Employed Pearson correlation, principal component analysis (PCA), and agglomerative hierarchical clustering to analyze trait variability and group genotypes.

Main Results:

• Observed significant variation in rooting patterns and branching across chickpea genotypes.
• Identified strong correlations among several selected root traits.
• PCA revealed three principal components explaining 81.5% of total variation; clustering identified three main genotype groups and 16 sub-groups.

Conclusions:

• The study successfully characterized substantial root trait diversity in chickpea germplasm.
• Identified genotype groups with distinct root properties suitable for further research and breeding.
• Findings provide a foundation for developing chickpea varieties with enhanced root systems for improved drought and abiotic stress adaptation.