Increased water availability at various timescales has different effects on stomatal closure point in isohydric piñon pine and anisohydric juniper

Kraklow, Vachel; Dickman, L. Turin; Ryan, Max G.; Lathrop, Emma; Heneghan, Jack; Musa, Dea; Sevanto, Sanna

doi:10.1038/s41598-025-00582-6

Increased water availability at various timescales has different effects on stomatal closure point in isohydric piñon pine and anisohydric juniper

Journal Article · Mon May 12 00:00:00 EDT 2025 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-025-00582-6· OSTI ID:2565755

Kraklow, Vachel; Dickman, L. Turin; Ryan, Max G.; Lathrop, Emma; Heneghan, Jack; Musa, Dea; Sevanto, Sanna

Abstract

Stomatal Closure Point (SCP) has commonly been used to describe drought response strategies in plants, with isohydric species maintaining relatively high, constant SCP compared to anisohydric species that can lower SCP with increasing drought severity. However, there is evidence that, within these groups, SCP may respond dynamically to environmental conditions. Here, we explored how increasing water availability affects SCP in classically isohydric piñon pine and anisohydric one-seed or Utah juniper at various spatial- (i.e., from branch, to tree, to ecosystem) and temporal- (i.e., hours to decades) scales. Our results show that short-term increases in water availability decreased SCP in isohydric piñon pine, making it more anisohydric, while short-term rehydration had no effect on SCP in anisohydric juniper. Increasing mean annual precipitation, on the other hand, increased SCP in both species. Our findings are consistent with documented differences in the use of ABA to control stomata in iso- and aniso-hydric species on short timescales, and with structural acclimation in both species at long timescales. These results illustrate that the local environment plays a large role in determining SCP.

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Sponsoring Organization:: USDOE

OSTI ID:: 2565755

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 15; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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