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Chrysanthemum CmHSFA4 gene positively regulates salt stress tolerance in transgenic chrysanthemum.

ABSTRACT: Salinity-induced Na+ toxicity and oxidative stress hamper plant growth. Here, we showed that expression of the chrysanthemum CmHSFA4, a homologue of the heat-shock factor AtHSFA4a, is inducible by salt and localizes to the nucleus. It is a transcription activator binding with HSE. Chrysanthemum overexpressing CmHSFA4 displayed enhanced salinity tolerance by limiting Na+ accumulation while maintaining K+ concentration, which is consistent with the up-regulation of ion transporters CmSOS1 and CmHKT2. Additionally, the transgenic plants reduced H2 O2 and O2?- accumulation under salinity, which could be due to up-regulation of ROS scavenger activities such as SOD, APX and CAT as well as CmHSP70, CmHSP90. Together, these results suggest that CmHSFA4 conferred salinity tolerance in chrysanthemum as a consequence of Na+ /K+ ion and ROS homeostasis.

SUBMITTER: Li F

PROVIDER: S-EPMC5999316 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature

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Chrysanthemum CmHSFA4 gene positively regulates salt stress tolerance in transgenic chrysanthemum.

Li Fei F Zhang Huanru H Zhao Husheng H Gao Tianwei T Song Aiping A Jiang Jiafu J Chen Fadi F Chen Sumei S

Plant biotechnology journal 20180122 7

Salinity-induced Na+ toxicity and oxidative stress hamper plant growth. Here, we showed that expression of the chrysanthemum CmHSFA4, a homologue of the heat-shock factor AtHSFA4a, is inducible by salt and localizes to the nucleus. It is a transcription activator binding with HSE. Chrysanthemum overexpressing CmHSFA4 displayed enhanced salinity tolerance by limiting Na+ accumulation while maintaining K+ concentration, which is consistent with the up-regulation of ...[more]

PMID: 29230937

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