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Sci. STKE, 15 May 2001
Vol. 2001, Issue 82, p. tw3
[DOI: 10.1126/scisignal.822001tw3]

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Plant Biology Chloroplast to Nucleus Feedback by SXD1

Provencher et al. have identified a gene, sxd1, that encodes a protein that functions in a negative feedback pathway from the chloroplast to the nucleus. In normal plants, SXD1 protein is found in chloroplasts; in its absence, SXD1-deficient plants produced and accumulated greater than normal quantities of sucrose, fructose, and glucose. Increased starch storage in SXD1-deficient plants led to severe distension of the chloroplasts. However, SXD1-deficient plants were not defective in exporting fixed carbon molecules from their chloroplasts. Rather, SXD1-deficient plants were unable to decrease the expression of genes essential for photosynthesis. Thus, the authors hypothesize that SXD1 may be important for sugar sensing and control of photosynthesis by chloroplast-to-nucleus feedback.

L. M. Provencher, L. Miao, N. Sinha, W. J. Lucas, Sucrose export defective1 encodes a novel protein implicated in chloroplast-to-nucleus signaling. Plant Cell 13, 1127-1141 (2001). [Abstract] [Full Text]

Citation: Chloroplast to Nucleus Feedback by SXD1. Sci. STKE 2001, tw3 (2001).

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