How plants detect low oxygen and respond to survive
Loreti E, Perata P
Plant Signaling
When your garden floods or soil gets waterlogged, the roots sitting in oxygen-starved mud aren't just suffocating passively, they're actively sensing the shortage and rewiring growth to cope, which explains why some plants bounce back from soggy spells and others don't.
Plants have a built-in way to sense when oxygen is running low, whether that's from a flood or from crowded tissue where oxygen can't reach easily. A special group of enzymes acts like an oxygen gauge: when oxygen is scarce, they stop breaking down certain proteins, letting those proteins build up and switch on survival responses. This same system also helps guide normal plant development, since some tissues are naturally low in oxygen even without stress.
Key Findings
Plant cysteine oxidases (PCOs) are the enzymes that sense molecular oxygen in plant cells
PCOs oxidize the amino-terminal cysteine residue of specific target proteins, marking them for degradation only when oxygen is present
This oxygen-dependent protein stability controls both stress responses to hypoxia and normal developmental pathways guided by naturally low-oxygen tissues
chevron_right Technical Summary
Scientists have identified how plants detect low-oxygen conditions at the molecular level: special enzymes sense when oxygen runs low and trigger changes in growth and development, helping plants survive flooding or dense tissue conditions where oxygen is scarce.
Abstract Preview
Original paper
Oxygen Sensing in Plants.
Hypoxia in plants is detrimental to plant growth and crop productivity. It typically arises from adverse environmental conditions that limit oxygen availability, thereby restricting mitochondrial r...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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