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Leaf water relations reflect canopy phenology rather than leaf life span in Sonoran Desert trees

Citation

Gonzalez-Rebeles, G and Terrazas, T and Mendez-Alonzo, R and Paz, H and Brodribb, TJ and Tinoco-Ojanguren, C, Leaf water relations reflect canopy phenology rather than leaf life span in Sonoran Desert trees, Tree Physiology, 41, (9) pp. 1627-1640. ISSN 0829-318X (2021) [Refereed Article]


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DOI: doi:10.1093/treephys/tpab032

Abstract

Plants from arid environments display covarying traits to survive or resist drought. Plant drought resistance and ability to survive long periods of low soil water availability should involve leaf phenology coordination with leaf and stem functional traits related to water status. This study tested correlations between phenology and functional traits involved in plant water status regulation in 10 Sonoran Desert tree species with contrasting phenology. Species seasonal variation in plant water status was defined by calculating their relative positions along the iso/anisohydric regulation continuum based on their hydroscape areas (HA)—a metric derived from the relationship between predawn and midday water potentials—and stomatal and hydraulic traits. Additionally, functional traits associated with plant water status regulation, including lamina vessel hydraulic diameter (DHL), stem-specific density (SSD) and leaf mass per area (LMA) were quantified per species. To characterize leaf phenology, leaf longevity (LL) and canopy foliage duration (FD) were determined. Hydroscape area was strongly correlated with FD but not with leaf longevity (LL); HA was significantly associated with SSD and leaf hydraulic traits (DHL, LMA) but not with stem hydraulic traits (vulnerability index, relative conductivity); and FD was strongly correlated with LMA and SSD. Leaf physiological characteristics affected leaf phenology when it was described as canopy FD better than when described as LL. Stem and leaf structure and hydraulic functions were not only relevant for categorizing species along the iso/anisohydric continuum but also allowed identifying different strategies of desert trees within the ‘fast–slow’ plant economics spectrum. The results in this study pinpoint the set of evolutionary pressures that shape the Sonoran Desert Scrub physiognomy.

Item Details

Item Type:Refereed Article
Keywords:drought responses, iso/anisohydry, phenotype diversity, plant economics spectrum, water status regulation
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Ecological physiology
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Effects of climate change on Australia (excl. social impacts)
UTAS Author:Brodribb, TJ (Professor Tim Brodribb)
ID Code:147892
Year Published:2021
Funding Support:Australian Research Council (DP190101552)
Web of Science® Times Cited:3
Deposited By:Plant Science
Deposited On:2021-11-22
Last Modified:2021-11-23
Downloads:0

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