Leaf ionome signatures as drought tolerance indicators in chilli.

Area of Science:

• Agricultural Science
• Plant Physiology
• Biochemistry

Background:

• Chilli (Capsicum annuum L.) cultivation is limited by water availability in warm, semi-arid regions.
• Drought stress significantly constrains chilli production, necessitating drought-tolerant varieties.
• Understanding plant responses to water deficit is crucial for crop improvement.

Purpose of the Study:

• To investigate the potential of ionomics in identifying drought tolerance mechanisms in chilli.
• To profile the leaf ionome of different chilli cultivars under drought conditions.
• To correlate ionome profiles with morpho-physiological and biochemical traits for drought tolerance markers.

Main Methods:

• Leaf ionome profiling using Inductively Coupled Plasma Mass Spectrometry (ICP-MS).
• Integration of ionomic data with morpho-physiological and biochemical characteristics.
• Application of principal component and correlation analyses to identify drought tolerance signatures.

Main Results:

• Specific ion accumulation (Ca, Cu, Mg, Fe, Mn, Mo, Ni, Sn) in leaves was identified as a signature of drought tolerance.
• Ionomic profiling revealed distinct patterns correlating with varying levels of drought tolerance across eight cultivars.
• The study successfully identified ionome markers indicative of drought tolerance in chilli.

Conclusions:

• Ionomics provides a simple, efficient, and high-throughput method for identifying drought-tolerant chilli genotypes.
• The identified ion markers can be utilized in pre-breeding programs for crop improvement.
• This approach facilitates the selection of superior drought-tolerant chilli cultivars for enhanced agricultural sustainability.