Abstract
The prothalli of the fern Ceratopteris richardii exhibit negative gravitropism when grown in darkness. However, no sedimentable organelles or substances have been detected in the prothallial cells, suggesting that a non-sedimentable gravisensor exists. We investigated whether chloroplasts are involved in the gravisensing system of C. richardii prothalli. We used a clumped-chloroplast mutant, clumped chloroplast 1 (cp1), in which the chloroplasts are detached from the plasma membrane and clustered around the nucleus likely because of a partial deletion in the KINESIN-LIKE PROTEIN FOR ACTIN-BASED CHLOROPLAST MOVEMENT 1 gene. The cp1 mutation resulted in prothalli that had a significantly diminished gravitropic response, while the phototropic response occurred normally. These results suggest that plasma membrane-anchored chloroplasts in prothallial cells function as one of the gravisensors in C. richardii prothalli.
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This work was supported by JSPS KAKENHI Grant Number JP15K11914.
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Kamachi, H., Tamaoki, D. & Karahara, I. Plasma membrane-anchored chloroplasts are necessary for the gravisensing system of Ceratopteris richardii prothalli. J Plant Res 130, 397–405 (2017). https://doi.org/10.1007/s10265-016-0889-x
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DOI: https://doi.org/10.1007/s10265-016-0889-x