Heat Generation and Dissipation in Plants: Can the Alternative Oxidative Phosphorylation Pathway Serve a Thermoregulatory Role in Plant Tissues Other Than Specialized Organs?

Breidenbach, R. W.; Saxton, Michael J.; Hansen, Lee D.; Criddle, Richard S.

doi:10.1104/pp.114.4.1137

Cited by 56 publications

(29 citation statements)

References 9 publications

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“…It has been suggested that the alternative oxidase function includes involvement in carbon metabolism , heat production (Breidenbach et al, 1997), reducing levels of reactive oxygen species (ROS; Maxwell et al, 1999;Yip and Vanlerberghe, 2001), and providing a means of continued energy production in the presence of inhibitors that affect cytochrome-mediated respiration (Joseph-Horne et al, 2001;. To investigate the production of ROS in the DcalA mutant, we used 2 0 ,7 0 -dichlorodihydrofluorescein diacetate (H 2 DCFDA), a cell-permeable ROS indicator that is non-fluorescent until acetate groups are removed (H 2 DCF) by intracellular esterases and oxidation occurs within the cell.…”

Section: Discussionmentioning

confidence: 99%

Phenotypic analysis of genes whose mRNA accumulation is dependent on calcineurin in Aspergillus fumigatus

Malavazi

Ferreira

Soriani

et al. 2009

Fungal Genetics and Biology

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Calcineurin plays an important role in the control of cell morphology and virulence in fungi. Calcineurin is a serine/threonine-specific protein phosphatase heterodimer consisting of a catalytic subunit A and a regulatory subunit B. A mutant of Aspergillus fumigatus lacking the calcineurin A (calA) catalytic subunit exhibited defective hyphal morphology related to apical extension and branching growth, which resulted in drastically decreased filamentation. Here, we investigated which pathways are influenced by A. fumigatus calcineurin during proliferation by comparatively determining the transcriptional profile of A. fumigatus wild type and DeltacalA mutant strains. Our results showed that the mitochondrial copy number is reduced in the DeltacalA mutant strain, and the mutant has increased alternative oxidase (aoxA) mRNA accumulation and activity. Furthermore, we identified four genes that encode transcription factors that have increased mRNA expression in the DeltacalA mutant. Deletion mutants for these transcription factors had reduced susceptibility to itraconazole, caspofungin, and sodium dodecyl sulfate (SDS).

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Section: Discussionmentioning

confidence: 99%

Phenotypic analysis of genes whose mRNA accumulation is dependent on calcineurin in Aspergillus fumigatus

Malavazi

Ferreira

Soriani

et al. 2009

Fungal Genetics and Biology

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“…Alternative oxidase is also believed to be involved in chilling protection [131]. However, Breidenbach et al [139], considering calorimetric, respirometric and heat dissipation data, have determined that the reactions of the alternative oxidase pathway do not have larger exothermic enthalpy changes than those of the cytochrome oxidase pathway. Heat dissipation after cold exposure due to the alternative oxidase is not sufficient to raise tissue or organelle temperature.…”

Section: Uncoupling Proteinsmentioning

confidence: 98%

Plant mitochondrial carriers: an overview

Laloi

1999

Cellular and Molecular Life Sciences (CMLS)

107

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In the two last decades, biochemical studies using mitochondrial swelling experiments or direct solute uptake in isolated mitochondria have lead to the identification of different transport systems at the level of the plant mitochondrial inner membrane. Although most of them have been found to have similar features to those identified in animal mitochondria, some differences have been observed between plant and animal transporters. More recently, molecular biology studies have revealed that most of the mitochondrial exchanges are performed by nuclear encoded proteins, which form a superfamily. Members of this family have been reported in animals, yeast as well as plants. This review attempts to give an overview of the present knowledge concerning the biochemical and molecular characterisation of plant members of the mitochondrial carrier family and, when possible, a comparison with carriers from other organisms.

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“…Nevertheless, the metabolic heat released by the increase in alternative respiration measured on infection sites most probably accounts for less than 1% of the temperature increase. This is based on energy-budget calculations 19,20 , using the difference in maximum activity between infected and control tissue as presented in Figure 3.…”

Section: Colocalization Of Thermal and Visual Lesions At Tmv-infectedmentioning

confidence: 99%

Presymptomatic visualization of plant–virus interactions by thermography

et al. 1999

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Salicylic acid (SA), produced by plants as a signal in defense against pathogens, induces metabolic heating mediated by alternative respiration in flowers of thermogenic plants, and, when exogenously applied, increases leaf temperature in nonthermogenic plants. We have postulated that the latter phenomenon would be detectable when SA is synthesized locally in plant leaves. Here, resistance to tobacco mosaic virus (TMV) was monitored thermographically before any disease symptoms became visible on tobacco leaves. Spots of elevated temperature that were confined to the place of infection increased in intensity from 8 h before the onset of visible cell death, and remained detectable as a halo around the ongoing necrosis. Salicylic acid accumulates during the prenecrotic phase in TMV-infected tobacco and is known to induce stomatal closure in certain species. We show that the time course of SA accumulation correlates with the evolution of both localized thermal effect and stomatal closure. Since the contribution of leaf respiration is marginal, we concluded that the thermal effect results predominantly from localized, SA-induced stomatal closure. The presymptomatic temperature increase could be of general significance in incompatible plant-pathogen interactions.

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Heat Generation and Dissipation in Plants: Can the Alternative Oxidative Phosphorylation Pathway Serve a Thermoregulatory Role in Plant Tissues Other Than Specialized Organs?

Cited by 56 publications

References 9 publications

Phenotypic analysis of genes whose mRNA accumulation is dependent on calcineurin in Aspergillus fumigatus

Phenotypic analysis of genes whose mRNA accumulation is dependent on calcineurin in Aspergillus fumigatus

Plant mitochondrial carriers: an overview

Presymptomatic visualization of plant–virus interactions by thermography

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