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SbCASP4 improves salt exclusion by enhancing the root apoplastic barrier
Xiaocen Wei1, Lili Liu2, Chaoxia Lu2
1Department of Acupuncture-Moxibustion and Tuina, Key Laboratory of New Material Research Institute, Shandong University of Traditional Chinese Medicine, Jinan, 250355, People's Republic of China.
Planta
|September 23, 2021
Summary
Sweet sorghum
Area of Science:
- Plant biology
- Molecular genetics
- Agronomy
Background:
- Sweet sorghum is a C4 crop valued for biomass and stress tolerance.
- Root salt exclusion is crucial for sweet sorghum's salt tolerance.
- The Casparian strip and membrane domain proteins (CASP) are key to salt exclusion.
Purpose of the Study:
- Investigate the function of SbCASP4 in sweet sorghum under salt stress.
- Determine the role of SbCASP4 in enhancing salt tolerance.
- Elucidate the regulatory mechanisms of SbCASP in response to salinity.
Main Methods:
- Cloning of SbCASP4 gene.
- Analysis of SbCASP4 expression in sweet sorghum endodermis.
- Heterologous expression of SbCASP4 in Arabidopsis thaliana.
- Histochemical staining and physiological measurements.
Main Results:
- SbCASP4 expression is induced by salt stress.
- Transgenic Arabidopsis expressing SbCASP4 showed enhanced salt tolerance.
- SbCASP4-expressing lines had reduced leaf Na+, lower stele PI accumulation, and less oxidative damage.
- Increased root length and higher expression of Casparian strip formation genes were observed.
Conclusions:
- SbCASP4 enhances salt tolerance in sweet sorghum.
- Improved tolerance is achieved by strengthening the root apoplastic barrier.
- SbCASP4 effectively blocks sodium ion transport to the shoot.
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