Guard cell photosynthesis is critical for stomatal turgor production, yet does not directly mediate CO2- and ABA-induced stomatal closing
Identifieur interne : 000610 ( Main/Exploration ); précédent : 000609; suivant : 000611Guard cell photosynthesis is critical for stomatal turgor production, yet does not directly mediate CO2- and ABA-induced stomatal closing
Auteurs : Tamar Azoulay-Shemer [États-Unis] ; Axxell Palomares [États-Unis] ; Andish Bagheri [États-Unis] ; Maria Israelsson-Nordstrom [Suède] ; Cawas B. Engineer [États-Unis] ; Bastiaan O. R. Bargmann [États-Unis] ; Aaron B. Stephan [États-Unis] ; Julian I. Schroeder [États-Unis]Source :
- The Plant journal : for cell and molecular biology [ 0960-7412 ] ; 2015.
Abstract
Stomata mediate gas exchange between the inter-cellular spaces of leaves and the atmosphere. CO2 levels in leaves (
Url:
DOI: 10.1111/tpj.12916
PubMed: 26096271
PubMed Central: 4532624
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en"><title>SUMMARY</title>
<p id="P2">Stomata mediate gas exchange between the inter-cellular spaces of leaves and the atmosphere. CO<sub>2</sub>
levels in leaves (<italic>Ci</italic>
) are determined by respiration, photosynthesis, stomatal conductance and atmospheric [CO<sub>2</sub>
]. [CO<sub>2</sub>
] in leaves mediates stomatal movements. The role of guard-cell photosynthesis in stomatal conductance responses is a matter of debate, and genetic approaches are needed. We have generated transgenic <italic>Arabidopsis</italic>
plants that are chlorophyll-deficient in guard cells only, expressing a constitutively active chlorophyllase in a guard-cell specific enhancer trap-line. Our data show that more than 90% of guard cells were chlorophyll-deficient. Interestingly, approximately ~ 45% of stomata had an unusual, previously not-described, morphology of thin-shaped chlorophyll-less stomata. Nevertheless, stomatal size, stomatal index, plant morphology, and whole-leaf photosynthetic parameters (PSII, qP, qN, FV′/FM′) were comparable to wild-type plants. Time-resolved intact leaf gas exchange analyses showed a reduction in stomatal conductance and carbon assimilation rates of the transgenic plants. Normalization of CO<sub>2</sub>
responses showed that stomata of transgenic plants respond to [CO<sub>2</sub>
] shifts. Detailed stomatal aperture measurements of normal kidney-shaped stomata, which lack chlorophyll, showed stomatal closing responses to [CO<sub>2</sub>
] elevation and abscisic acid (ABA), while thin-shaped stomata were continuously closed. Our present findings show that stomatal movement responses to [CO<sub>2</sub>
] and ABA are functional in guard cells that lack chlorophyll. These data suggest that guard-cell CO<sub>2</sub>
and ABA signal transduction are not directly modulated by guard-cell photosynthesis/electron transport. Moreover, the finding that chlorophyll-less stomata cause a “deflated” thin-shaped phenotype, suggests that photosynthesis in guard cells is critical for energization and guard-cell turgor production.</p>
</div>
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<name sortKey="Stephan, Aaron B" sort="Stephan, Aaron B" uniqKey="Stephan A" first="Aaron B." last="Stephan">Aaron B. Stephan</name>
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<country name="Suède"><noRegion><name sortKey="Israelsson Nordstrom, Maria" sort="Israelsson Nordstrom, Maria" uniqKey="Israelsson Nordstrom M" first="Maria" last="Israelsson-Nordstrom">Maria Israelsson-Nordstrom</name>
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