Plant Mitochondria: From Genome to Function

Day, David A.; Millar, A. Harvey; Whelan, James

doi:10.1007/978-1-4020-2400-9

Cited by 18 publications

(4 citation statements)

References 299 publications

(556 reference statements)

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“…This was demonstrated in Phaseolus vulgaris (Rychter and Mikulska, 1990; Rychter et al, 1992), Catharanthus roseus (Hoefnagels et al, 1993), Chlamydomonas reinhardtii (Weger and Dasgupta, 1993), Lupinus albus (Florez-Sarasa et al, 2014), and tobacco cell cultures (Parsons et al, 1999). The electron flow directed to the AOX pathway allows conserving the intercellular P pool (Theodorou et al, 1991; Parsons et al, 1999; Juszczuk et al, 2001; Juszczuk and Rychter, 2003; Day et al, 2004) but also allows NADH oxidation, produced during citrate synthesis, to maintain continuation of TCA cycle reactions (Vanlerberghe and McIntosh, 1996; Shane et al, 2004; Gupta et al, 2012; Florez-Sarasa et al, 2014). Moreover, under P limitation, AOX activity in roots seems positively correlated with synthesis and release of carboxylates (citrate and malate, López-Bucio et al, 2000; Veneklaas et al, 2003; Del-Saz et al, 2018).…”

Section: Hormonal and Energetic Regulation Of Plant Metabolism Under mentioning

confidence: 99%

“…Excluding the mycorrhizal context, several studies regarding plant physiology have been conducted under high (or optimal for the plant partner) P availability, and the metabolic frame is therefore relatively well known. In absence of stress, plant metabolism, especially photosynthesis, flows optimally, maximizing the energy yield (Nátr, 1992), associated with COX activity resulting in a high ATP/ADP ratio (Sluse and Jarmuszkiewicz, 1998; Day et al, 2004). This constant energy flux enables a steady state of metabolism (Kouchi and Yoneyama, 1984; Rontein et al, 2002).…”

Section: Hormonal and Energetic Regulation Of Plant Metabolism Under mentioning

confidence: 99%

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Unraveling the Initial Plant Hormone Signaling, Metabolic Mechanisms and Plant Defense Triggering the Endomycorrhizal Symbiosis Behavior

Bedini¹,

Mercy²,

Schneider³

et al. 2018

Front. Plant Sci.

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Arbuscular mycorrhizal (AM) fungi establish probably one of the oldest mutualistic relationships with the roots of most plants on earth. The wide distribution of these fungi in almost all soil ecotypes and the broad range of host plant species demonstrate their strong plasticity to cope with various environmental conditions. AM fungi elaborate fine-tuned molecular interactions with plants that determine their spread within root cortical tissues. Interactions with endomycorrhizal fungi can bring various benefits to plants, such as improved nutritional status, higher photosynthesis, protection against biotic and abiotic stresses based on regulation of many physiological processes which participate in promoting plant performances. In turn, host plants provide a specific habitat as physical support and a favorable metabolic frame, allowing uptake and assimilation of compounds required for the life cycle completion of these obligate biotrophic fungi. The search for formal and direct evidences of fungal energetic needs raised strong motivated projects since decades, but the impossibility to produce AM fungi under axenic conditions remains a deep enigma and still feeds numerous debates. Here, we review and discuss the initial favorable and non-favorable metabolic plant context that may fate the mycorrhizal behavior, with a focus on hormone interplays and their links with mitochondrial respiration, carbon partitioning and plant defense system, structured according to the action of phosphorus as a main limiting factor for mycorrhizal symbiosis. Then, we provide with models and discuss their significances to propose metabolic targets that could allow to develop innovations for the production and application of AM fungal inocula.

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Section: Hormonal and Energetic Regulation Of Plant Metabolism Under mentioning

confidence: 99%

Section: Hormonal and Energetic Regulation Of Plant Metabolism Under mentioning

confidence: 99%

Unraveling the Initial Plant Hormone Signaling, Metabolic Mechanisms and Plant Defense Triggering the Endomycorrhizal Symbiosis Behavior

Bedini¹,

Mercy²,

Schneider³

et al. 2018

Front. Plant Sci.

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“…These results are consistent with the reported lower activity of the malate-oxaloacetate shuttle in the AOX1a mutant compared to the WT seeds [ 38 ]. MDH catalyzes the interconversion of malate and oxaloacetate in mitochondria [ 39 , 40 ]. MDH activity was shown to be reduced in rice seeds during artificial aging treatment [ 5 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of OsAOX1a Deficiency on Mitochondrial Metabolism at Critical Node of Seed Viability in Rice

Lin

Xia

et al. 2023

Plants

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Mitochondrial alternative oxidase 1a (AOX1a) plays an extremely important role in the critical node of seed viability during storage. However, the regulatory mechanism is still poorly understood. The aim of this study was to identify the regulatory mechanisms by comparing OsAOX1a-RNAi and wild-type (WT) rice seed during artificial aging treatment. Weight gain and time for the seed germination percentage decreased to 50% (P50) in OsAOX1a-RNAi rice seed, indicating possible impairment in seed development and storability. Compared to WT seeds at 100%, 90%, 80%, and 70% germination, the NADH- and succinate-dependent O2 consumption, the activity of mitochondrial malate dehydrogenase, and ATP contents all decreased in the OsAOX1a-RNAi seeds, indicating that mitochondrial status in the OsAOX1a-RNAi seeds after imbibition was weaker than in the WT seeds. In addition, the reduction in the abundance of Complex I subunits showed that the capacity of the mitochondrial electron transfer chain was significantly inhibited in the OsAOX1a-RNAi seeds at the critical node of seed viability. The results indicate that ATP production was impaired in the OsAOX1a-RNAi seeds during aging. Therefore, we conclude that mitochondrial metabolism and alternative pathways were severely inhibited in the OsAOX1a-RNAi seeds at critical node of viability, which could accelerate the collapse of seed viability. The precise regulatory mechanism of the alternative pathway at the critical node of viability needs to be further analyzed. This finding might provide the basis for developing monitoring and warning indicators when seed viability declines to the critical node during storage.

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“…The synthesis of amino acids in the cytosol and plastids by the glutamine synthetase/glutamine:2-oxoglutarate aminotransferase (GS/GOGAT) enzymes requires a supply of carbon skeletons, which are obtained through the direct or indirect export of alpha-ketoglutaric acid from the mitochondrial tricarboxylic acid cycle (TCA cycle) (Day et al, 2004; Gauthier et al, 2010). Amino acids can also be used as a source of electrons to fuel the mETC during carbon starvation (Cavalcanti et al, 2017; Szal & Podgórska, 2012; van Aken, 2021).…”

Section: Introductionmentioning

confidence: 99%

Inactivation of mitochondrial complex IV inPhyscomitrium patensreveals the essential role of respiration in coordinating plants metabolism

Vera-Vives,

Mellon,

Gurrieri

et al. 2024

Preprint

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Photosynthetic organisms use sunlight as energy source but rely on respiration during the night and in non-photosynthetic tissues. Respiration is also active in photosynthetically active cells, where its role is still unclear due to a lack of viable mutants. Plants lacking cytochrome c oxidase (complex IV) activity are generally lethal but were here isolated exploiting the possibility of generating knockout lines through vegetative propagation in the moss Physcomitrium patens. The mutants showed severely impaired growth, with an altered composition of the respiratory apparatus and increased electron transfer through the alternative oxidase. The light phase of photosynthesis remained largely unaffected while the efficiency of carbon fixation was moderately reduced. Transcriptomic and metabolomic analyses showed that the disruption of the cytochrome pathway had broad consequences for carbon and nitrogen metabolism. A major alteration in nitrogen assimilation was observed with a general reduction in amino acid abundance. A partial rescue of the growth could be obtained by growing the plants with an external supply of amino acids but not with sugars, demonstrating that respiration in plant photosynthetic cells plays an essential role at the interface between carbon and nitrogen metabolism and a key role in providing carbon skeletons for amino acid biosynthesis.

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Plant Mitochondria: From Genome to Function

Cited by 18 publications

References 299 publications

Unraveling the Initial Plant Hormone Signaling, Metabolic Mechanisms and Plant Defense Triggering the Endomycorrhizal Symbiosis Behavior

Unraveling the Initial Plant Hormone Signaling, Metabolic Mechanisms and Plant Defense Triggering the Endomycorrhizal Symbiosis Behavior

Effects of OsAOX1a Deficiency on Mitochondrial Metabolism at Critical Node of Seed Viability in Rice

Inactivation of mitochondrial complex IV inPhyscomitrium patensreveals the essential role of respiration in coordinating plants metabolism

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