Gradients in embolism resistance within stems driven by secondary growth in herbs

Plant Cell & Environment, Год журнала: 2024, Номер 47(8), С. 2986 - 2998

Опубликована: Апрель 21, 2024

Abstract The stems of some herbaceous species can undergo basal secondary growth, leading to a continuum in the degree woodiness along stem. Whether formation growth stem base results differences embolism resistance between and upper portions is unknown. We assessed leaves simultaneously within same individuals two divergent that mature bases. were Solanum lycopersicum (tomato) Senecio minimus (fireweed). Basal plants both displayed advanced greater than This also resulted significant vulnerability segmentation species. Greater woodier was found alongside decreases pith‐to‐xylem ratio, increases proportion xylem, lignin content. show there be considerable variation across herbs this linked present. A gradient could an adaptation ensure reproduction or resprouting during episodes drought late lifecycle.

Язык: Английский

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Using long‐term field data to quantify water potential regulation in response to VPD and soil moisture in a conifer tree

New Phytologist, Год журнала: 2025, Номер unknown

Опубликована: Март 13, 2025

Summary The regulation of vascular water potential (Ψ stem ) by stomata is one the most dynamic and important behaviours in plants, playing a central role determining gas exchange vulnerability to drought. Yet, species‐specific characterization Ψ regulatory behaviour response soil or atmospheric dryness remains elusive. We hypothesize that can only be defined when combination both vapour pressure deficit (VPD) effects considered. To test this hypothesis, we collected high‐resolution time series using optical dendrometers from trees hardy conifer, Callitris rhomboidea , monitored across multiple highly variable growing seasons. over total 571 d could predicted on basis diurnal VPD ( R 2 = 0.74) five mechanism‐aligned parameters describe specific stomatal regulation. Our novel approach predict variation seasonal change data continuous monitoring technique creates new opportunity quantitatively compare use climatic sensitivity between diverse species genotypes field laboratory.

Язык: Английский

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Hydraulic vulnerability difference between branches and roots increases with environmental aridity

Oecologia, Год журнала: 2024, Номер 205(1), С. 177 - 190

Опубликована: Май 1, 2024

Язык: Английский

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A one-way ticket: wheat roots do not functionally refill xylem emboli following rehydration

PLANT PHYSIOLOGY, Год журнала: 2024, Номер unknown

Опубликована: Сен. 19, 2024

Understanding xylem embolism spread in roots is essential for predicting the loss of function across root systems during drought. However, lasting relevance to plant recovery depends on whether can refill emboli and resume after rehydration. Using MicroCT optical dye staining methods, we investigated repair rehydrated intact wheat (Triticum aestivum L.'Krichauff') exposed a severe water deficit -3.5 MPa, known cause approximately 30 % total network this species. Air vessels remained clearly observable using overnight This result was verified by system quantification emboli, both which indicated lack functional 60 hours following soil re-saturation. The absence refilling has substantial implications how understand Our findings suggest that causes irreversible damage soil-root hydraulic connection affected parts network.

Язык: Английский

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Root sweet root: how date palm uses osmotic adjustment to thrive in arid climates

Journal of Experimental Botany, Год журнала: 2025, Номер 76(4), С. 909 - 912

Опубликована: Фев. 25, 2025

This article comments on: Franzisky BL, Mueller HM, Du B, Lux T, White PJ, Carpentier SC, Winkler JB, Schnitzler JP, Kudla J, Kangasjärvi Reichelt M, Mithöfer A, Mayer KFX, Rennenberg H, Ache P, Hedrich R, Messerer Geilfus CM. 2025. Date palm diverts organic solutes for root osmotic adjustment and protects leaves from oxidative damage in early drought acclimation. Journal of Experimental Botany 76, 1244–1265 https://doi.org/10.1093/jxb/erae456.

Язык: Английский

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Similar response of canopy conductance to increasing vapor pressure deficit and decreasing soil conductivity with drought among five morphologically contrasting but co-occurring pine species

Agricultural and Forest Meteorology, Год журнала: 2025, Номер 366, С. 110479 - 110479

Опубликована: Март 9, 2025

Язык: Английский

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In Situ Rainwater Harvesting System Slows Forest Decline through Increasing Soil Water Content, Fine-Root Traits, and Plant Hydraulic Conductivity

Forests, Год журнала: 2024, Номер 15(3), С. 571 - 571

Опубликована: Март 21, 2024

Large-scale vegetation restoration campaigns have been implemented on the Chinese Loess Plateau, which resulted in higher soil moisture deficits this region. This, turn, has hampered healthy growth of planted trees, leading to a decline and, severe cases, mortality trees. Therefore, rational regulation and utilization rainwater, primary water source region, may alleviate drought stress, ensuring sustainability ecosystem. In study, we investigated impact situ rainwater collection infiltration systems (IRCISs) water, fine-root distribution, xylem vascular, hydraulic conductivity characteristics declining Robinia pseudoacacia forests. The results demonstrated that application an IRCIS can effectively increase plant available content (0–5.0 m) particular, treatment significantly increased conduit diameter while substantially reducing percentage loss both roots branches. Furthermore, reduced root biomass distribution depth during wet dry years. This implies IRCISs are beneficial for survival. findings study significant devising strategic methodologies planning management resources.

Язык: Английский

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Dynamic soil hydraulic resistance regulates stomata

New Phytologist, Год журнала: 2024, Номер 244(1), С. 147 - 158

Опубликована: Авг. 2, 2024

The onset of stomatal closure reduces transpiration during drought. In seed plants, drought causes declines in plant water status which increases leaf endogenous abscisic acid (ABA) levels required for closure. There are multiple possible points increased belowground resistance the soil-plant atmospheric continuum that could decrease potential enough to trigger ABA production and subsequent decreases transpiration. We investigate dynamic patterns levels, hydraulic conductance point failure highly embolism-resistant species Callitris tuberculata using continuous dendrometer measurements show biosynthesis begin before any permanent predawn potential, collapse pathway xylem embolism spread. find a but recoverable soil close proximity roots is most likely driver midday needed

Язык: Английский

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Feedback between the Xylem Vessel Water and the Soil Pore Water in a Shrub-Encroached Grassland

Опубликована: Янв. 1, 2024

Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

Язык: Английский

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Weak link or strong foundation? Vulnerability of fine root networks and stems to xylem embolism

New Phytologist, Год журнала: 2024, Номер unknown

Опубликована: Сен. 12, 2024

Resolving the position of roots in whole-plant hierarchy drought-induced xylem embolism resistance is fundamental for predicting when species become isolated from soil water resources. Published research generally suggests that are most vulnerable organ plant vascular system, although estimates vary significantly. However, our knowledge root excludes fine (< 2 mm diameter) form bulk total absorptive surface area network and nutrient uptake. We measured stem vulnerability 10 major land clades (five angiosperms, three conifers, a fern lycophyte), using standardised situ methods (Optical Methods MicroCT). Mean across matched or exceeded stems all study species. In six these (one fern, one lycophyte, conifers angiosperm), were significantly more resistant than stems. No clear relationship was found between conduit diameter vulnerability. These results provide insight into hydraulic pathway at site uptake, challenge long-standing assumption

Язык: Английский

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