Abstract
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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Acknowledgments
We thank Dr. Ian Moore (University of Oxford) for providing plasmid pVKHEn6-GFP-HDEL; Dr. Ikuko Hara-Nishimura (Kyoto University) for providing sp-GFP-2SC/pBI221, sp-GFP-CTPP/pBI221, sp-NTPP-GFP/pBI221 plasmids and transgenic seeds sp-GFP-2SC/pBI121, and Dr. Zhaoyang Zhou and Qianqian Qin for providing ethylene (Zhou et al. 2011) and GA signal homozygous mutants. This work was supported by National Natural Science Foundation of China (No. 30771091, 30970234, and 41201048) and the Program for New Century Excellent Talents in University (NCET-11-0212) by the Ministry of Education to H. L. (2011), by Grant 29Y127E71 from the “One Hundred Talents” Project of the Chinese Academy of Sciences, and by the Foundation for Excellent Youth Scholars of CAREERI, CAS (51Y251A11).
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Communicated by J.-H. Liu.
P. Zhao and F. Liu contributed equally to this work.
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Fig. S1 Phenotypes of the wt and sec20 plants with or without treatments at 7 day after stratification. Photographs were taken at the end of treatments.
Fig. S2 Expression patterns of AtSec20 in the ABA, GA, and ethylene signal mutants. RNA was isolate from 7 d-old plants. Transcript levels were measured by real-time RT-PCR, and actin2 was used as an internal control. The expression levels in Col 0 and Ler were designated as a value 1. Data represent the mean ± SD. Bars with different letters were significantly different at the 0.01 level.
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Zhao, P., Liu, F., Wang, B. et al. AtSec20 is involved in osmotic stress tolerance and AtSec20 mutation unaffects the integrity of intracellular organelles and the anterograde biosynthetic trafficking. Acta Physiol Plant 35, 1625–1632 (2013). https://doi.org/10.1007/s11738-012-1205-6
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DOI: https://doi.org/10.1007/s11738-012-1205-6