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Moss helps chart the conquest of land by plants
Date:2/4/2010

ccation tolerance on a moss that wasn't desiccation tolerant, but that it needed ABI3 to do that. We also found that ABA triggered genes that we assume are essential for desiccation tolerance, but that ABI3 does not play a role in preparing for dessication and is instead essential for the stability of the gene products after rehydration."

What happened to seed plants?

"Our hypothesis," says Quatrano, "is that the first plants to move onto land were desiccation tolerant like P. patens and the other bryophytes, such as the hornworts and liverworts. As vascular plants evolved, they abandoned desiccation tolerance in favor of adaptations such as extensive root systems, waxy cuticles and stomata, that would allow them to prevent water loss rather than simply to survive it." The genes that confer desiccation tolerance were not lost, however. Instead their expression was sequestered within spores or seeds.

Could these genes and the signaling pathway that controls them be reactivated in the vegetative tissue of the plants?

"Our goal," says Quatrano, "is to characterize the entire regulatory network that controls the desiccation-tolerance system. Once we understand that network, we might be able to 'engineer' it into the vegetative tissue of seed plants to make them more tolerant to water loss."

"But this is all very speculative," he adds.

Still the vision of sun-burned fields of corn blushing green when long-awaiting rain finally relieves a drought is exciting to contemplate.


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Contact: Diana Lutz
dlutz@wustl.edu
314-935-5272
Washington University in St. Louis
Source:Eurekalert  

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