Cargando…
Resistant xylem from roots to peduncles sustains reproductive water supply after drought-induced cavitation of wheat leaves
BACKGROUND AND AIMS: Many annual grasses exhibit drought-avoiding life cycles in which rapid reproduction must be completed before soil water is exhausted. This strategy would seem to require a hydraulic system capable of sustaining reproduction at all costs to the rest of the plant, yet little is k...
Autores principales: | , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Oxford University Press
2023
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10184455/ https://www.ncbi.nlm.nih.gov/pubmed/36946316 http://dx.doi.org/10.1093/aob/mcad048 |
_version_ | 1785042156695584768 |
---|---|
author | Harrison Day, Beatrice L Brodribb, Timothy J |
author_facet | Harrison Day, Beatrice L Brodribb, Timothy J |
author_sort | Harrison Day, Beatrice L |
collection | PubMed |
description | BACKGROUND AND AIMS: Many annual grasses exhibit drought-avoiding life cycles in which rapid reproduction must be completed before soil water is exhausted. This strategy would seem to require a hydraulic system capable of sustaining reproduction at all costs to the rest of the plant, yet little is known about the whole-plant structure of hydraulic vulnerability in grasses. METHODS: We examine vulnerability to water-stress-induced xylem cavitation in roots, flag leaves, and basal and apical regions of peduncles of wheat (Triticum aestivum L. ‘Krichauff’) to understand the staged failure of xylem function in severe drought. The functionality of segmented vulnerabilities is tested by conducting rehydration experiments after acute dehydration. KEY RESULTS: We show that water supply to peduncles is more drought resistant than in leaves due to greater xylem cavitation resistance, ensuring a pathway of water can be maintained from the roots to the reproductive tissues even after severe water deficit. Differential rehydration of peduncles compared to leaves following drought confirmed the functionality of xylem supply from roots to seed after water stress sufficient to completely cavitate flag leaf vessels. CONCLUSIONS: These results demonstrate that a proportion of the hydraulic pathway between roots and seeds remains functional under extreme dehydration, suggesting that vulnerability traits in this key grass species reflect its reproductive strategy. |
format | Online Article Text |
id | pubmed-10184455 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-101844552023-05-16 Resistant xylem from roots to peduncles sustains reproductive water supply after drought-induced cavitation of wheat leaves Harrison Day, Beatrice L Brodribb, Timothy J Ann Bot Original Articles BACKGROUND AND AIMS: Many annual grasses exhibit drought-avoiding life cycles in which rapid reproduction must be completed before soil water is exhausted. This strategy would seem to require a hydraulic system capable of sustaining reproduction at all costs to the rest of the plant, yet little is known about the whole-plant structure of hydraulic vulnerability in grasses. METHODS: We examine vulnerability to water-stress-induced xylem cavitation in roots, flag leaves, and basal and apical regions of peduncles of wheat (Triticum aestivum L. ‘Krichauff’) to understand the staged failure of xylem function in severe drought. The functionality of segmented vulnerabilities is tested by conducting rehydration experiments after acute dehydration. KEY RESULTS: We show that water supply to peduncles is more drought resistant than in leaves due to greater xylem cavitation resistance, ensuring a pathway of water can be maintained from the roots to the reproductive tissues even after severe water deficit. Differential rehydration of peduncles compared to leaves following drought confirmed the functionality of xylem supply from roots to seed after water stress sufficient to completely cavitate flag leaf vessels. CONCLUSIONS: These results demonstrate that a proportion of the hydraulic pathway between roots and seeds remains functional under extreme dehydration, suggesting that vulnerability traits in this key grass species reflect its reproductive strategy. Oxford University Press 2023-03-22 /pmc/articles/PMC10184455/ /pubmed/36946316 http://dx.doi.org/10.1093/aob/mcad048 Text en © The Author(s) 2022. Published by Oxford University Press on behalf of the Annals of Botany Company. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Articles Harrison Day, Beatrice L Brodribb, Timothy J Resistant xylem from roots to peduncles sustains reproductive water supply after drought-induced cavitation of wheat leaves |
title | Resistant xylem from roots to peduncles sustains reproductive water supply after drought-induced cavitation of wheat leaves |
title_full | Resistant xylem from roots to peduncles sustains reproductive water supply after drought-induced cavitation of wheat leaves |
title_fullStr | Resistant xylem from roots to peduncles sustains reproductive water supply after drought-induced cavitation of wheat leaves |
title_full_unstemmed | Resistant xylem from roots to peduncles sustains reproductive water supply after drought-induced cavitation of wheat leaves |
title_short | Resistant xylem from roots to peduncles sustains reproductive water supply after drought-induced cavitation of wheat leaves |
title_sort | resistant xylem from roots to peduncles sustains reproductive water supply after drought-induced cavitation of wheat leaves |
topic | Original Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10184455/ https://www.ncbi.nlm.nih.gov/pubmed/36946316 http://dx.doi.org/10.1093/aob/mcad048 |
work_keys_str_mv | AT harrisondaybeatricel resistantxylemfromrootstopedunclessustainsreproductivewatersupplyafterdroughtinducedcavitationofwheatleaves AT brodribbtimothyj resistantxylemfromrootstopedunclessustainsreproductivewatersupplyafterdroughtinducedcavitationofwheatleaves |