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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Respiratory complex I deficiency induces drought tolerance by impacting leaf stomatal and hydraulic conductances
Planta, Volume 235, No. 3, Year 2012
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Description
To investigate the role of plant mitochondria in drought tolerance, the response to water deprivation was compared between Nicotiana sylvestris wild type (WT) plants and the CMSII respiratory complex I mutant, which has low-efficient respiration and photosynthesis, high levels of amino acids and pyridine nucleotides, and increased antioxidant capacity. We show that the delayed decrease in relative water content after water withholding in CMSII, as compared to WT leaves, is due to a lower stomatal conductance. The stomatal index and the abscisic acid (ABA) content were unaffected in well-watered mutant leaves, but the ABA/stomatal conductance relation was altered during drought, indicating that specific factors interact with ABA signalling. Leaf hydraulic conductance was lower in mutant leaves when compared to WT leaves and the role of oxidative aquaporin gating in attaining a maximum stomatal conductance is discussed. In addition, differences in leaf metabolic status between the mutant and the WT might contribute to the low stomatal conductance, as reported for TCA cycle-deficient plants. After withholding watering, TCA cycle derived organic acids declined more in CMSII leaves than in the WT, and ATP content decreased only in the CMSII. Moreover, in contrast to the WT, total free amino acid levels declined whilst soluble protein content increased in CMSII leaves, suggesting an accelerated amino acid remobilisation. We propose that oxidative and metabolic disturbances resulting from remodelled respiration in the absence of Complex I activity could be involved in bringing about the lower stomatal and hydraulic conductances. © 2011 Springer-Verlag.
Authors & Co-Authors
Djebbar, Réda
Algeria, Algiers
Université Des Sciences et de la Technologie Houari Boumediene
France, Gif-sur-yvette
Université Paris-saclay
Rzigui, Touhami
France, Gif-sur-yvette
Université Paris-saclay
Tunisia, Tunis
Université de Tunis el Manar, Faculté Des Sciences de Tunis
Pétriacq, Pierre
France, Gif-sur-yvette
Université Paris-saclay
Mauve, Caroline
France, Gif-sur-yvette
Université Paris-saclay
Priault, Pierrick
France, Gif-sur-yvette
Université Paris-saclay
Fresneau, Chantal
France, Gif-sur-yvette
Université Paris-saclay
de Paepe, Marianne
France, Gif-sur-yvette
Université Paris-saclay
Flórez-Sarasa, Igor D.
Spain, Palma
Universitat de Les Illes Balears
Benhassaine-Kesri, Ghouziel
France, Paris
Sorbonne Université
Streb, Peter
France, Gif-sur-yvette
Université Paris-saclay
Gakière, Bertrand
France, Gif-sur-yvette
Université Paris-saclay
Cornic, Gabriel
France, Gif-sur-yvette
Université Paris-saclay
de Paepe, Rosine
France, Gif-sur-yvette
Université Paris-saclay
Statistics
Citations: 13
Authors: 13
Affiliations: 5
Identifiers
Doi:
10.1007/s00425-011-1524-7
ISSN:
00320935
e-ISSN:
14322048
Research Areas
Environmental
Noncommunicable Diseases