The Contribution of Plant Dioxygenases to Hypoxia Signaling

Iacopino, Sergio; Licausi, Francesco

doi:10.3389/fpls.2020.01008

Cited by 13 publications

(10 citation statements)

References 80 publications

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“…O 2 is involved in many enzyme-catalyzed redox reactions, and redox chemistry is an essential feature for life on Earth ( Dietz, 2003 ). Any enzyme catalyzing redox reactions might, in principle, act as an O 2 sensor when O 2 levels change below the affinity constant of the enzyme for that substrate ( Wang et al , 2017 ; Schmidt et al , 2018 a ; Iacopino and Licausi, 2020 ). Multiple sensing mechanisms would allow the activation of different low-O 2 -triggered responses in specific spatial and temporal patterns in distinct cells or even organelles inside the cells, tissues, organs, or parts of the plant.…”

Section: Oxygen Sensing In Plants Largely Depends On the N-degron Pathway-mediated Degradation Of Erfviis But Alternative Sensing Mechanimentioning

confidence: 99%

The hypoxia–reoxygenation stress in plants

León

Castillo

Gayubas

2020

Journal of Experimental Botany

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Plants are very plastic in adapting growth and development to changing adverse environmental conditions. This feature will be essential for plants to survive climate changes characterized by extreme temperatures and rainfall. Although plants require molecular oxygen (O2) to live, they can overcome transient low-O2 conditions (hypoxia) until return to standard 21% O2 atmospheric conditions (normoxia). After heavy rainfall, submerged plants in flooded lands undergo transient hypoxia until water recedes and normoxia is recovered. The accumulated information on the physiological and molecular events occurring during the hypoxia phase contrasts with the limited knowledge on the reoxygenation process after hypoxia, which has often been overlooked in many studies in plants. Phenotypic alterations during recovery are due to potentiated oxidative stress generated by simultaneous reoxygenation and reillumination leading to cell damage. Besides processes such as N-degron proteolytic pathway-mediated O2 sensing, or mitochondria-driven metabolic alterations, other molecular events controlling gene expression have been recently proposed as key regulators of hypoxia and reoxygenation. RNA regulatory functions, chromatin remodeling, protein synthesis, and post-translational modifications must all be studied in depth in the coming years to improve our knowledge on hypoxia–reoxygenation transition in plants, a topic with relevance in agricultural biotechnology in the context of global climate change.

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Section: Oxygen Sensing In Plants Largely Depends On the N-degron Pathway-mediated Degradation Of Erfviis But Alternative Sensing Mechanimentioning

confidence: 99%

The hypoxia–reoxygenation stress in plants

León

Castillo

Gayubas

2020

Journal of Experimental Botany

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“…The hydrolysis of starch occurs when the signals involved in starvation and low O 2 state converge in the activation of GA-independent α-amylases [ 26 ]. GA is probably not produced under anoxia due to the requirement of O 2 for the synthesis and the production of GA-active molecules [ 27 , 28 ].…”

Section: Rice Germinates Under Anoxia and Submergencementioning

confidence: 99%

Cereal Germination under Low Oxygen: Molecular Processes

Gómez-Álvarez

Pucciariello

2022

Plants

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Cereal crops can differ greatly in tolerance to oxygen shortage under germination and seedling establishment. Rice is able to germinate and elongate the coleoptile under submergence and anoxia. This capacity has been attributed to the successful use of starchy reserves through a molecular pathway activated by sugar starvation and low oxygen. This pathway culminates with the expression of α-amylases to provide sugars that fuel the sink organs. On the contrary, barley and wheat are unable to germinate under anoxia. The sensitivity of barley and wheat is likely due to the incapacity to use starch during germination. This review highlights what is currently known about the molecular mechanisms associated with cereal germination and seedling establishment under oxygen shortage with a special focus on barley and rice. Insights into the molecular mechanisms that support rice germination under low oxygen and into those that are associated with barley sensitivity may be of help for genetic improvement programs.

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“…Also, protein phosphatase activity was over-represented within the QTL regions. Oxidoreductase activity that involves in hormone homeostasis and biotic stresses defense (Iacopino & Licausi, 2020) was enriched as well.…”

Section: 3mentioning

confidence: 99%

Mapping of stem rot resistance in peanut indicates significant effect for plant architecture locus

et al. 2022

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Stem rot, caused by the Sclerotium rolfsii, imposes severe yield losses in peanuts (Arachis hypogaea L.) worldwide. Breeding for resistance is challenging because not enough is known about mechanisms for resistance. The goals of this study were to (a) evaluate the field resistance of recombinant inbred lines derived from a resistant × susceptible cross, (b) associate quantitative loci (QTLs), and (c) reveal potential mechanisms for resistance. Lines were inspected during 3 yr in field conditions. Plants were manually inoculated and rated for three parameters: disease level, number of damaged plants/center, and disease power. Significant effects were found for the lines and the environment in all three parameters. Heritability and year‐to‐year correlations were highly significant, suggesting a consistent response of the lines to the stem rot pressure. Quantitative trait loci mapping was performed based on a previously constructed genetic map. Overall, 20 significant QTLs were found for the resistance parameters, concentrating in four locations on chromosomes A07, A03, B03, and B05. Out of the four loci, three were reported in previous studies with different genetic backgrounds suggesting a wide effect. The B05 QTL was the strongest, with the phenotypic variation explained of 11.6–21.7%. Interestingly, this QTL is colocalized with a previously identified major locus for branching habit trait. An additional field trial performed on 14 lines found a significant branching habit effect, wherein bunch‐types lines were more resistant than spreading‐types, suggesting that plant architecture can be a possible factor influencing the infection rate of S. rolfsii on the field level.

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The Contribution of Plant Dioxygenases to Hypoxia Signaling

Cited by 13 publications

References 80 publications

The hypoxia–reoxygenation stress in plants

The hypoxia–reoxygenation stress in plants

Cereal Germination under Low Oxygen: Molecular Processes

Mapping of stem rot resistance in peanut indicates significant effect for plant architecture locus

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