Abstract
The higher plants of today array a large number of small chloroplasts in their photosynthetic cells. This array of small chloroplasts results from organelle division via prokaryotic binary fission in a eukaryotic plant cell environment. Functional abnormalities of the tightly coordinated biochemical event of chloroplast division lead to abnormal chloroplast development in plants. Here, we described an abnormal chloroplast phenotype in an ethylene insensitive ethylene response1-1 (etr1-1) of Arabidopsis thaliana. Extensive transgenic and genetic analyses revealed that this organelle abnormality was not linked to etr1-1 or ethylene signaling, but linked to a second mutation in ACCUMULATION AND REPLICATION3 (ARC3), which was further verified by genetic complementation analysis. Despite the normal expression of other plastid division-related genes, the loss of ARC3 caused the enlargement of chloroplasts as well as the diminution of a photosynthetic protein Rubisco in etr1-1. Our study has suggested that the increased size of the abnormal chloroplasts may not be able to fully compensate for the loss of a greater array of small chloroplasts in higher plants.
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Cho, YH., Kim, GD. & Yoo, SD. Giant chloroplast development in ethylene response1-1 is caused by a second mutation in ACCUMULATION AND REPLICATION OF CHLOROPLAST3 in Arabidopsis . Mol Cells 33, 99–103 (2012). https://doi.org/10.1007/s10059-012-2245-x
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DOI: https://doi.org/10.1007/s10059-012-2245-x