16.イネGARP転写因子OsGLK1を介したオーキシン/サイトカイニンによる葉緑体分化調節機構の解明(口頭発表)

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Plant growth largely depends on the chemical energy produced by photosynthesis in the chloroplast. Chloroplasts are differentiated from proplastids in response to light and/or hormonal signals, although the overall mechanisms are not clarified. When OsGLK1 encoding a GARP-type transcriptional regulator was ectopically overexpressed, rice calli exhibited green color on a 2,4-D-containing selection (N6D) medium, on which wild-type calli are ivory yellow. The green calli accumulated transcripts for a set of genes involved in chloroplast functions. These results showed that OsGLK1 is a key factor regulating chloroplast development. We also observed that the endogenous OsGLK1 mRNA level increased synchronously with the greening of wild-type calli after transfer to regeneration medium containing a low level of auxin and high concentration of cytokinin. Therefore, we hypothesize that auxin and cytokinin control chloroplast development by regulating the expression of OsGLK1. So we carefully examined the relationship between auxin/cytokinin concentrations and the expression of OsGLK1, and found that auxin repressed and cytokinin promoted the expression of OsGLK1. As a consequence, possible changes in OsGLK1 activity may affect chloroplast development. To elucidate the mechanisms of the hormonal regulation of OsGLK1 expression, we are currently investigating whether and which factor(s), involved in the cytokinin signal transduction, regulate the expression of OsGLK1.
2009-10-06

16.イネGARP転写因子OsGLK1を介したオーキシン/サイトカイニンによる葉緑体分化調節機構の解明(口頭発表)

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