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Crop Biotech Update

AKIN10 Delays Flowering by Inactivating IDD8 Transcription Factor in Arabidopsis

May 6, 2015

Sugar metabolism is related to flowering transition in many plants. In Arabidopsis, the transcription factor IDD8 regulates flowering time by modifying sugar metabolism under sugar-limiting conditions. Meanwhile, the SUCROSE NONFERMENTING-1-RELATED PROTEIN KINASE 1 (SnRK1) is activated by sugar deprivation. Thus, SnRK1-overexpressing plants and IDD8-deficient mutants have similar phenotypes, including delayed flowering, hinting that SnRK1 is involved in IDD8-mediated control of flowering.

A team led by Chung-Mo Park, from the Seoul National University, examined if SnRK1 is associated with IDD8 in flowering time control. Overproduction of AKIN10, the catalytic subunit of SnRK1, delayed flowering in Arabidopsis, as was observed in IDD8-deficient mutant. Researchers found that AKIN10 phosphorylates IDD8, and reduces its activity.

This shows that AKIN10 counters the IDD8 function in flowering time control, explaining the delayed flowering phenotypes of AKIN10-overexpressing plants and IDD8-deficient mutants.

For more information, read the full article on BMC Plant Biology.