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Histone Deacetylase 701 enhances abiotic stress resistance in rice at the seedling stage by suppressing expression of OsWRKY45.
- Being sessile organisms, plants need to adapt to unfavorable environmental stresses to modulate their optimal growth and development. When plants are exposed to abiotic stresses, a large number of genes are triggered and synchronized to optimize their growth under diverse abiotic stresses. Expression of Histone Deacetylase 701 (HDT701) is regulated by abiotic stress conditions and HDT701 overexpressing transgenic rice shows higher tolerance to osmotic and salt stresses at the seedling stage as previously reported. hdt701 mutant seedlings displayed increased sensitivity to both salt and osmotic stresses. Expression levels of Oryza sativa Phytoene Synthase 3 (OsPY3) and 9-cis-epoxycarotenoid dioxygenase 4 (NCED4), ABA biosynthesis genes induced by salt stress, and STRESS-RESPONSIVE NAC 1 (SNAC1), an abiotic stress inducible gene, were significantly decreased in the mutants, revealing that HDT701 functions upstream of them in regulating abiotic stresses. The expression of Oryza sativa respiratory burst oxidase homolog I (OsrbohI), an NADPH oxygenase gene that is responsible for the production of reactive oxygen species (ROS), was also remarkably suppressed in the mutant seedlings while that of OsWRKY45, an upstream suppressor of SNAC1 and NCED4, was dramatically induced. These resulting data suggest that HDT701 might enhance the salt and osmotic stress tolerance of rice by suppressing OsWRKY45 as well as through ROS pathway by enhancing OsrbohI.
Antt Htet Wai
- 2nd Myanmar-Korea conference on Useful Plants, Dagon University