Intraspecific Variation in Surface Water Uptake in a Perennial Desert Shrub

Release Date:

Variability in root architecture is one source of plant trait diversification that affects how water is distributed among plants. 

Researchers investigated how intraspecific variation in big sagebrush shrub roots among subspecies and cytotypes could affect its ability to access surface water. Using an isotope tracer to examine plants’ belowground zone of influence, researchers found that lateral root development and activity is more strongly related to genetic variability within big sagebrush plants than to plant size. Contrary to expectations, plant crown volume was a weak predictor of water uptake. Subspecies adapted to deep soils generally had a smaller horizontal reach, and polyploid cytotypes were associated with greater water uptake compared to diploids. This study shows that variation in life strategies is linked to mechanisms of resource acquisition such as competition for water, not only how well adapted populations are to physical properties of the site. Findings can inform management practices and conservation of arid scrublands, particularly seed-transfer guidelines for big sagebrush.

 

Zaiats, A., Lazarus, B.E., Germino, M.J., Serpe, M., Richardson, B., Buerki, S., Caughlin, T., 2020, Intraspecific variation in surface water uptake in a perennial desert shrub: Functional Ecology, https://doi.org/10.1111/1365-2435.13546

 

Related Content

Filter Total Items: 2
Date published: November 16, 2017
Status: Active

Plant-Soil-Environment Laboratory (FRESC)

We produce basic and applied science needed to manage landscapes in ways that make them resistant and resilient to stressors such as wildfire, exotic plant invasions, drought, and temperature extremes. These stressors impact ecosystem productivity and functioning and pose costly risks to human health and safety in the western United States. We team with other state and federal agencies to find...

Date published: November 13, 2017
Status: Active

Plant Responses to Temperature and Water Limitation

Weather and climate impacts on dominant native perennials must be understood in order to efficiently manage our western landscapes. We use an ecophysiological approach, linking to population, community, and landscape ecology, to understand the impacts and responses of plants on or to their environment.