Journal
ACTA PHYSIOLOGIAE PLANTARUM
Volume 35, Issue 5, Pages 1625-1632Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11738-012-1205-6
Keywords
Osmotic stress; SNARE; AtSec20; Retrograde transport
Categories
Funding
- National Natural Science Foundation of China [30771091, 30970234, 41201048]
- Program for New Century Excellent Talents in University by the Ministry of Education [NCET-11-0212]
- Chinese Academy of Sciences [29Y127E71]
- Foundation for Excellent Youth Scholars of CAREERI, CAS [51Y251A11]
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The soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) play essential roles in intracellular trafficking. However, few experimental data have clarified their roles in the stress responses and the early secretary pathway in Arabidopsis. The AtSec20 gene encodes a protein that is homologous to yeast Sec20p and mammalian BNIP1, which are involved in the Golgi-to-ER retrograde trafficking in yeast and mammalian cells. In this study, AtSec20 is found to be required for the responses to salt stress, osmotic stress and gibberellin (GA) during seed germination and early seedling establishment. Mutation of AtSec20 unaffects the morphology of intracellular organelles, such as endoplasmic reticulum (ER), trans-Golgi network, and peroxisome, and vacuolar protein trafficking is normal in sec20 mutants. Collectively, these results imply that the AtSec20 is involved in abiotic stress tolerance, potentially via roles in retrograde vesicle fusion process in Arabidopsis.
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