Root hydraulic conductivity and adjustments in stomatal conductance: hydraulic strategy in response to salt stress in a halotolerant species
| Autor: | Nicolás Daniel Ayub, Gabriela Soto, Jorge Bellati, Victoria Andrea Vitali, Gabriela Amodeo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Stomatal conductance
Osmotic shock Water flow AQUAPORINS Otras Ciencias Biológicas Turgor pressure WATER RELATIONS STOMATAL CONDUCTANCE Aquaporin Context (language use) Conductancia Hidráulica de Raíces Plant Science Biology Aquaporins Osmotic Stress Ciencias Biológicas purl.org/becyt/ford/1 [https] Acuaporinas Hydraulic conductivity suberization Botany purl.org/becyt/ford/1.6 [https] Conductancia Estomática Research Articles salt stress fungi food and beverages BETA VULGARIS Estrés Osmótico soil–plant–atmosphere continuum SALT STRESS SPAC SUBERIZATION stomatal conductance Biophysics Halotolerance root hydraulic conductivity ROOT HYDRAULIC CONDUCTIVITY Beta vulgaris water relations CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET AoB Plants AoB Plants 7 : plv136 (Noviembre 2015) INTA Digital (INTA) Instituto Nacional de Tecnología Agropecuaria instacron:INTA |
| Popis: | In plants, the total hydraulic resistance adjustment is a crucial trait in tolerance. We explored the link between root and shoot by means of simultaneously characterizing root hydraulic conductivity and stomatal conductance in a halotolerant model (Beta vulgaris). Under salt stress, B. vulgaris triggers a hydraulic strategy tuning the root and shoot in a coupled process. After halting the stress, the profile of root efficiency at transporting water differed from that of shoot adjustment, underlining the relevance of the root for the overall hydraulic response: root capability allows recovery of water flow before the aerial water demand is restored. Recent advances at the molecular level are introducing a new scenario that needs to be integrated into the analysis of plant hydraulic properties. Although it is not yet clear to what extent this scenario alters the current proposal for the hydraulic circuit models, it introduces new insights when studying plants that are able to easily overcome water restrictions. In this context, our aim was to explore water adjustments in a halotolerant model (Beta vulgaris) by studying the coordination between the root in terms of root hydraulic conductivity (Lpr) and the shoot as reflected in the stomatal conductance (gs). The root water pathways were also analysed in terms of root suberization (apoplastic barrier) and aquaporin transcript levels (cell-to-cell pathway). Beta vulgaris showed the ability to rapidly lose (4 h) and gain (24 h) turgor when submitted to salt stress (200 mM). The reduction profile observed in Lpr and gs was consistent with a coupled process. The tuning of the root water flow involved small variations in the studied aquaporin's transcripts before anatomical modifications occurred. Exploring Lpr enhancement after halting the stress contributed to show not only a different profile in restoring Lpr but also the capacity to uncouple Lpr from gs. Beta vulgaris root plays a key role and can anticipate water loss before the aerial water status is affected. |
| Databáze: | OpenAIRE |
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