Short‐term control of maize cell and root water permeability through plasma membrane aquaporin isoforms
Identifieur interne : 000327 ( Main/Exploration ); précédent : 000326; suivant : 000328Short‐term control of maize cell and root water permeability through plasma membrane aquaporin isoforms
Auteurs : Charles Hachez [Belgique] ; Dmitry Veselov [Belgique, Russie] ; Qing Ye [Belgique] ; Hagen Reinhardt [Belgique] ; Thorsten Knipfer [Irlande (pays), États-Unis] ; Wieland Fricke [Irlande (pays)] ; François Chaumont [Belgique]Source :
- Plant, Cell & Environment [ 0140-7791 ] ; 2012-01.
English descriptors
- KwdEn :
Abstract
Although it is widely accepted that aquaporins are involved in the regulation of root water uptake, the role of specific isoforms in this process is poorly understood. The mRNA expression and protein level of specific plasma membrane intrinsic proteins (PIPs) were analysed in Zea mays in relation to cell and root hydraulic conductivity. Plants were analysed during the day/night period, under different growth conditions (aeroponics/hydroponics) and in response to short‐term osmotic stress applied through polyethylene glycol (PEG). Higher protein levels of ZmPIP1;2, ZmPIP2;1/2;2, ZmPIP2;5 and ZmPIP2;6 during the day coincided with a higher water permeability of root cortex cells during the day compared with night period. Similarly, plants which were grown under aeroponic conditions and which developed a hypodermis (‘exodermis’) with Casparian bands, effectively forcing more water along a membranous uptake path across roots, showed increased levels of ZmPIP2;5 and ZmPIP1;2 in the rhizodermis and exodermis. When PEG was added to the root medium (2–8 h), expression of PIPs and cell water permeability in roots increased. These data support a role of specific PIP isoforms, in particular ZmPIP1;2 and ZmPIP2;5, in regulating root water uptake and cortex cell hydraulic conductivity in maize.
Url:
DOI: 10.1111/j.1365-3040.2011.02429.x
Affiliations:
- Belgique, Irlande (pays), Russie, États-Unis
- Californie, Province du Brabant wallon, Région wallonne
- Louvain-la-Neuve
- Université catholique de Louvain
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mays</term><term>diurnal regulation</term><term>exudation</term><term>hydraulic conductivity</term><term>osmotic stress</term><term>pressure probe</term><term>root water uptake</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Although it is widely accepted that aquaporins are involved in the regulation of root water uptake, the role of specific isoforms in this process is poorly understood. The mRNA expression and protein level of specific plasma membrane intrinsic proteins (PIPs) were analysed in Zea mays in relation to cell and root hydraulic conductivity. Plants were analysed during the day/night period, under different growth conditions (aeroponics/hydroponics) and in response to short‐term osmotic stress applied through polyethylene glycol (PEG). Higher protein levels of ZmPIP1;2, ZmPIP2;1/2;2, ZmPIP2;5 and ZmPIP2;6 during the day coincided with a higher water permeability of root cortex cells during the day compared with night period. Similarly, plants which were grown under aeroponic conditions and which developed a hypodermis (‘exodermis’) with Casparian bands, effectively forcing more water along a membranous uptake path across roots, showed increased levels of ZmPIP2;5 and ZmPIP1;2 in the rhizodermis and exodermis. When PEG was added to the root medium (2–8 h), expression of PIPs and cell water permeability in roots increased. 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