Plant roots and shoots may fight drought separately, not together
Sanaei A, Saxena S, Mueller KE, McCormack ML, Schuldt B
Climate Adaptation
If you've ever wondered why two drought-tolerant plants in your yard have wildly different root systems, this research suggests root strategy and drought toughness above ground aren't as tightly linked as gardeners might assume.
Scientists looked at whether a plant's root traits, like how thick or nitrogen-rich they are, predict how well the plant resists drought above ground. Surprisingly, the connection was weak: plants with 'thriftier' roots weren't reliably better at handling dry spells in their leaves and stems. This hints that other hidden root traits, like how deep roots grow, might matter more for drought survival than the traits scientists usually measure.
Key Findings
Compiled data spanning five above-ground hydraulic traits and four fine-root economic traits across mostly woody species
Acquisitive species with higher root nitrogen and lower root tissue density showed only a slight trend toward lower drought resistance above ground
Thicker-rooted species showed slightly higher drought resistance than thin-rooted species, but overall root-shoot trait relationships were weak
chevron_right Technical Summary
Scientists compared root traits with above-ground drought defenses across many woody plant species and found the two are only weakly linked, suggesting a plant's roots and shoots may adapt to drought somewhat independently.
Abstract Preview
Original paper
On the relationship between root economics and plant hydraulic traits.
Drought stress constrains the productivity of terrestrial ecosystems and the distribution of plant species. To withstand drought stress, plants have evolved diverse water-use strategies. Despite th...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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