SHUKR Gene: Clue to Flowering Plants’ Rapid Evolution
Why in the news
CSIR-CCMB, Hyderabad, reported a genetic mechanism that may explain the sudden diversification of flowering plants, Darwin’s ‘abominable mystery’ of about 130 million years ago.
Key facts
- SHUKR directs F-box genes that recycle proteins in pollen cells.
- Losing it gives non-viable pollen.
- Restricted to eudicots, 75% of flowering plants.
- SHUKR and its F-box partners evolve fast, helping pollen adapt to climates.
| Phase | Role | Dominant in |
|---|---|---|
| Gametophyte (haploid) | Makes gametes | Mosses |
| Sporophyte (diploid) | Makes spores | Flowering plants |
Significance
- Points to a shift to sporophyte-controlled reproduction, suited to heat and dryness.
- Eudicots supply cereals, pulses and oilseeds; climate-induced male sterility threatens yields.
- Applications: preconditioned pollen and stress-tolerant crops.
Exam angle
- Institute: CSIR-CCMB, Hyderabad.
- Terms: haploid, diploid, eudicots.