Conserved and Lineage-Specific Roles of KEA-Mediated Ion Homeostasis in Chlamydomonas.
Wunder T, Eulitz L, Kramer L, Ali ZM, Ostermeier M
Plant Signaling
Every green leaf catching sunlight in your garden runs on chloroplasts that must maintain a precise chemical balance — this research reveals the molecular pump responsible has been so essential that evolution kept it virtually unchanged from pond algae to garden plants, which helps explain why chloroplast stress can cascade into stunted growth even when soil, light, and water seem perfect.
Inside every green plant cell are tiny structures called chloroplasts that capture sunlight. Scientists found that a microscopic pump controlling the chemical environment inside chloroplasts is so important that it works almost identically in both pond-dwelling single-celled algae and complex land plants — despite these life forms being separated by over a billion years of evolution. When they disabled this pump, the algae's chloroplasts warped, cells failed to divide correctly, and growth collapsed, much like what happens in flowering plants without the same pump.
Key Findings
Knocking out CrKEA1 in Chlamydomonas algae caused chloroplast deformation, photoinhibition, and frequent failed or unequal cell divisions, confirmed by single-cell time-lapse imaging.
CrKEA1 from Chlamydomonas fully rescued growth and ribosomal RNA maturation when expressed in Arabidopsis plants lacking the equivalent genes, proving functional conservation across more than a billion years of divergence.
Loss of the ion pump triggered some shared responses across species (suppression of photosynthesis-associated nuclear genes) but others unique to Chlamydomonas (chloroplast unfolded protein response activation and disrupted cell-cycle/plastid-fission gene expression).
chevron_right Technical Summary
Scientists discovered that a molecular ion pump inside chloroplasts — the structures that make plants green — has performed the same critical job for over a billion years, from single-celled algae to complex land plants. Disrupting this pump in green algae derailed chloroplast development and cell division, mirroring defects seen in land plants, yet the two lineages evolved distinct downstream responses.
Abstract Preview
In Arabidopsis thaliana, seamless plastid gene expression and development depend on finely balanced ion homeostasis across the inner envelope (IE) membrane, maintained by the K+/H+ antiporters AtKE...
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