The DroughtBox: A new tool for phenotyping residual branch conductance and its temperature dependence during drought.
Plant Cell Environ
; 43(6): 1584-1594, 2020 06.
Article
em En
| MEDLINE
| ID: mdl-32187686
ABSTRACT
Xylem hydraulic failure is a major driver of tree death during drought. However, to better understand mortality risk in trees, especially during hot-drought events, more information is required on both rates of residual water-loss from small branches (gres ) after stomatal closure, as well as the phase transition temperature (Tp ), beyond which gres significantly increases. Here, we describe and test a novel low-cost tool, the DroughtBox, for phenotyping gres and Tp across species. The system consists of a programmable climatically controlled chamber in which branches dehydrate and changes in the mass recorded. Test measurements show that the DroughtBox maintains stable temperature and relative humidity across a range of set points, a prerequisite for getting accurate gres and Tp values. Among a study group of four conifer and one angiosperm species, we observed a range of gres (0.44-1.64 mmol H2 O m-2 s-1 ) and Tp (39.4-43.8°C) values. Furthermore, the measured time to hydraulic failure varied between two conifers species and was shortened in both species following a heatwave event. The DroughtBox is a reliable and customizable tool for phenotyping gres and Tp , as well as for testing models of time to hydraulic failure that will improve our ability to assess climate change impacts on plants.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Temperatura
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Água
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Magnoliopsida
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Secas
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Plant Cell Environ
Ano de publicação:
2020
Tipo de documento:
Article