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A New Gateway in Plant Systemic Alarm Signalling

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November 02, 2026

Prelims: Current events of national and international importance | Environment

Why in News?

Recently, researchers identifying CNGC13, a previously uncharacterized protein serving as a vital cyclic nucleotide-gated calcium ion (Ca^2+) channel.

  • CNGC 13 acts as a primary entry gateway in plants' systemic alarm system.
  • It enables damaged leaves under insect herbivore attack to rapidly transmit long-distance defense signals to undamaged distant leaves.

Key Highlights                  

Parameter

Scientific Details

Research Institution
  • National Institute of Plant Genome Research (NIPGR), New Delhi.

Identified Protein/Channel
  • CNGC13 (Cyclic Nucleotide-Gated Channel 13) — a specialized calcium ion-permeable channel located in plasma membranes.

Signal Transduction Cascade
  • Initial Wounding - When a chewing insect attacks a leaf, damaged cells release extracellular glutamate.
  • Channel Opening- Glutamate binding triggers membrane depolarization and opens CNGC13 channels.
  • (Ca^2+) Influx Wave - Influx of extracellular (Ca^2+) through CNGC13 generates a systemic, propagating calcium wave traveling along plant vascular tracks at speeds of millimeters per second.
  • Distal Activation- Undamaged leaves receive the calcium wave, triggering the synthesis of defense phytohormones (such as Jasmonic Acid) and anti-herbivore toxins before pests arrive.

Strategic Significance

  • Mitigating Global Crop Losses- Insect pests account for roughly 20% of global annual crop losses (expected to escalate due to climate warming).
  • Deciphering plant-native early warning systems provides targets for developing self-defending crop varieties without heavy synthetic chemical insecticides.
  • Biotechnology & Molecular Breeding - Knock-out studies demonstrate that plants lacking functional CNGC13 fail to launch systemic defenses.
  • Modulating or over-expressing CNGC13 via gene editing (CRISPR) or marker-assisted selection can yield insect-resistant cultivars in major staples like rice, wheat, and mustard.

CNGC 13

Reference

The Hindu | New gateway in plants’ alarm system
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