Poplars, just like humans, also feel stressed

Washington, May 7 (ANI): Just like humans, trees too, feel stressed. And scientists have now claimed that hormone suppression could help common poplars- cottonwoods and aspens-deal with stress.

Trees' stress can come from a lack of water or too much water, from scarcity of a needed nutrient, from pollution or a changing climate.

A new study led by Michigan Technological University scientists, has identified the molecular mechanism that Populus-the scientific name for common poplars-uses to adapt to changing soil conditions, as well as some of the genes that turn the process off or on.

And now they look forward to apply what they've learned to find ways to use biotechnology or selective breeding to modify the trees to make them more stress-tolerant.

"Our hope is that by understanding how this works, we can manipulate the system so the plants can adapt faster and better to stressful conditions," explained Dr. Victor Busov.

The researchers analysed thousands of genes in the Populus genome, the only tree genome that has been completely sequenced.

They were searching for the mechanism that regulates the plant's decision to grow tall or to spread its roots out in an extensive underground exploration system that can sample the soil near and far until it finds what the rest of the plant needs.

The key players turned out to be a family of hormones called gibberellins, referred to by the scientists as GAs.

"GAs' role in root development is poorly understood and the role of GAs in lateral root formation is almost completely unknown," said Busov.

Lateral roots are the tangle of tiny roots that branch out from the primary root of a plant.

"They are the sponges, the ones that go looking for nutrients, for water-the ones that do most of the work," explained Busov.

The researchers found that GAs interact with other plant hormones such as auxin to tell the plant whether to concentrate on reaching for the sky or on building a bigger, better network of roots under ground.

"The GAs and auxin are definitely talking, molecularly," said Busov.

Growing poplar seedlings mutated to make them GA-deficient, the scientists compared their root and stem growth to others that contained moderate amounts of GAs and a control group of wild-type plants with normal GAs.

They found that the more GAs, the more a plant's stem flourished, but its roots remained spindly.

When GA production was shut down, either by using mutants that lacked the necessary genes or by silencing the genes that form the molecular on-off switch, the resulting plants looked dwarfed, but their lateral roots grew luxuriant and full.

Application of GA to the GA-deficient dwarf plants rapidly reversed the process. The plants grew tall, but their lateral root systems shrivelled.

"Clearly, lack of the hormone promotes growth below ground, while the hormone itself promotes growth above ground. This is a natural mechanism that we don't know much about. It's always a tradeoff between growth above ground and growth below ground. Normally there is a fine balance, and this balance is a little disturbed under stress," said Busov.

The study has been published in a recent issue of the journal The Plant Cell. (ANI)