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Crop Biotech Update

OsBBX14 Delays Heading Date in Rice

March 16, 2016

B-box (BBX) proteins in Arabidopsis are involved in growth and development. However, little is known about BBX in rice. Researchers from Shandong Academy of Agricultural Sciences, Shandong Normal University and the Chinese Academy of Sciences identified the rice BBX protein, encoded by Oryza sativa BBX14 (OsBBX14).

OsBBX14 protein was found to be highly expressed in flag leaf blades and shows a diurnal rhythm under photoperiodic conditions. OsBBX14-overexpressing lines exhibited delayed heading date under long-day (LD) and short-day (SD) conditions, while RNAi knockout lines of OsBBX14 had similar heading dates to the wild types.

Further analysis showed that florigen genes, Hd3a and RFT1, were downregulated in the overexpressing lines under LD and SD conditions, leading to the delayed heading. However, the mechanism of how OsBBX14 regulates heading date under LD and SD conditions are different.

For a more information, read the article on Plant Science.