ENST: How Roots Penetrate Hard Soil

Like slow-motion jackhammers,
plant roots drive their way
through hardpan soil

This article was published at Evolution News last August.

How Roots Become Jackhammers
by David Coppedge
Evolution News & Science Today, August 16, 2024

Many of us have wondered how seedlings get into the smallest cracks in driveways and sidewalks, finding openings and then penetrating hard layers to reach sunlight. In time, the seemingly flimsy shoots can cause the asphalt or concrete to buckle! Homeowners know that without stopping this natural process in time, a driveway can become a field of weeds. It’s amazing to think that such delicate stems, without muscles, can penetrate hard surfaces that greatly exceed their own strength.

Grok/XI

A similar thing happens down at the tips of roots. A growing root tip may encounter a layer of hardpan that blocks its progress. It can either bend sideways or remain in place and call in its team of jackhammers. How it does that was the subject of a paper in Current Biology by 11 researchers, mostly from China, who want to know how to increase rice crops on which many people around the world depend for food. Rice farmers can try to plow the soil to loosen it up, which is very work intensive on terraced hillsides. An alternative would be to genetically modify the plant’s own built-in jackhammers to increase their ability to penetrate whatever soil they encounter….

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