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Title: Anisohydric behavior linked to persistent hydraulic damage and delayed drought recovery across seven North American tree species

Journal Article · · New Phytologist
DOI:https://doi.org/10.1111/nph.15699· OSTI ID:1494946
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. School of Biological Sciences University of Utah Salt Lake City UT 84112 USA, Department of Biology Indiana University Bloomington IN 47405 USA
  2. School of Public and Environmental Affairs Indiana University Bloomington IN 47405 USA
  3. Department of Biology Indiana University Bloomington IN 47405 USA

Summary The isohydry‐anisohydry spectrum has become a popular way to characterize plant drought responses and recovery processes. Despite the proven utility of this framework for understanding the interconnected physiological changes plants undergo in response to water stress, new challenges have arisen pertaining to the traits and tradeoffs that underlie this concept. To test the utility of this framework for understanding hydraulic traits, drought physiology and recovery, we applied a 6 wk experimental soil moisture reduction to seven tree species followed by a 6 wk recovery period. Throughout, we measured hydraulic traits and monitored changes in gas exchange, leaf water potential, and hydraulic conductivity. Species’ hydraulic traits were not coordinated, as some anisohydric species had surprisingly low resistance to embolism (P 50 ) and negative safety margins. In addition to widespread hydraulic damage, these species also experienced reductions in photosynthesis and stem water potential during water stress, and delayed recovery time. Given that we observed no benefit of being anisohydric either during or after drought, our results indicate the need to reconsider the traits and tradeoffs that underlie anisohydric behavior, and to consider the environmental, biological and edaphic processes that could allow this strategy to flourish in forests.

Sponsoring Organization:
USDOE
OSTI ID:
1494946
Journal Information:
New Phytologist, Journal Name: New Phytologist Vol. 222 Journal Issue: 4; ISSN 0028-646X
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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