Why in the News?
A new study from researchers at IISER Bhopal has revealed how a single protein called BBX32 helps plants time the critical moment they emerge from darkness into light.
What is BBX32?
- Function: BBX32 is a plant protein that helps a seedling keep its protective hook closed as it pushes through the soil.
- Protection Mechanism: The hook shape shields the soft shoot tip in darkness; BBX32 extends this protection until it’s safe to open.
- Ethylene Activation: Underground, the plant hormone ethylene activates the BBX32 gene, signaling the seedling to stay protected.
How does it work?
- Light Stabilization: Once exposed to light, BBX32 is no longer broken down, allowing it to accumulate on one side of the hook.
- Protein Chain Reaction: BBX32 activates PIF3, which then activates HLS1, the protein that directly keeps the hook bent.
- Lab Testing: Plants were tested in different light types and sand to simulate real soil. Extra ethylene increased BBX32 activity.
- Mutant Comparison: Plants without BBX32 opened too early. Only 25% broke through sand, compared to 40% of normal and 80% with extra BBX32.
- Degradation Control: In darkness, COP1 breaks down BBX32. Ethylene slows this process. Light fully stabilizes BBX32.
- Coordinated Timing: The protein’s behavior is guided by light, hormone signals, and pressure, ensuring the hook opens at the right time.
Why is studying BBX32 important?
- Better Crop Survival: BBX32 can help develop crops that grow well in dense, wet, or compacted soils.
- Climate Adaptation: As climate change leads to tougher soil conditions, BBX32 can improve seedling emergence and survival.
- Boosting Yields: Supporting hook protection even slightly longer can lead to stronger early growth and higher productivity.
- Genetic Research: BBX32 is a potential target for gene editing in plants to improve resilience during germination.
- Broader Insight: Studying BBX32 helps us understand how plants balance internal signals with external cues for safe growth.
| [UPSC 2018] Which of the following leaf modifications occur(s) in the desert areas to inhabit water loss?
1. Hard and waxy leaves 2. Tiny leaves 3. Thorns instead of leaves Select the correct answer using the code given below: Options: (a) 2 and 3 only (b) 2 only (c) 3 only (d) 1, 2 and 3* |
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