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Crop Biotech Update

OsMYB45 Plays a Vital Role in Cadmium Stress Resistance in Rice

September 6, 2017

Cadmium (Cd) is one of the most toxic heavy metal elements and can cause serious damage to plant cells. The team of Shubao Hu from Nanjing Agricultural University in China hypothesized that the transcription factor OsMYB45 is involved in Cd stress response in rice.

OsMYB45 was found to be highly expressed in rice leaves, husks, stamens, pistils, and lateral roots, and its expression is induced by Cd stress. Mutation of OsMYB45 resulted in hypersensitivity to Cd treatment, which doubled the concentration of hydrogen peroxide in the leaves of the mutants, while the activity of catalase (CAT), which catalyzes the breakdown of hydrogen peroxide to water and oxygen, was halved.

Further analysis indicated that the expression of OsCATA and OsCATC, genes related to catalase, is significantly lower in the mutants than in wildtypes. Overexpression of OsMYB45 in the mutant also rescued the mutant phenotype.

These results reveal that OsMYB45 plays an important role in tolerance to Cd stress in rice.

For more information, read the article in Plant Science.