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Proteomic analysis of seed germination under salt stress in soybeans

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Abstract

Soybean (Glycine max (L.) Merrill) is a salt-sensitive crop, and its production is severely affected by saline soils. Therefore, the response of soybean seeds to salt stress during germination was investigated at both physiological and proteomic levels. The salt-tolerant cultivar Lee68 and salt-sensitive cultivar N2899 were exposed to 100 mmol/L NaCl until radicle protrusion from the seed coat. In both cultivars, the final germination percentage was not affected by salt, but the mean germination times of Lee68 and N2899 were delayed by 0.3 and 1.0 d, respectively, compared with controls. In response to salt stress, the abscisic acid content increased, and gibberellic acid (GA1+3) and isopentenyladenosine decreased. Indole-3-acetic acid increased in Lee68, but remained unchanged in N2899. The proteins extracted from germinated seeds were separated using two-dimensional gel electrophoresis (2-DE), followed by Coomassie brilliant blue G-250 staining. About 350 protein spots from 2-DE gels of pH range 3 to 10 and 650 spots from gels of pH range 4 to 7 were reproducibly resolved, of which 18 protein spots showed changes in abundance as a result of salt stress in both cultivars. After matrix-assisted laser desorption ionization-time of flight-mass spectroscopy (MALDI-TOF-MS) analysis of the differentially expressed proteins, the peptide mass fingerprint was searched against the soybean UniGene database and nine proteins were successfully identified. Ferritin and 20S proteasome subunit β-6 were up-regulated in both cultivars. Glyceraldehyde 3-phosphate dehydrogenase, glutathione S-transferase (GST) 9, GST 10, and seed maturation protein PM36 were down-regulated in Lee68 by salt, but still remained at a certain level. However, these proteins were present in lower levels in control N2899 and were up-regulated under salt stress. The results indicate that these proteins might have important roles in defense mechanisms against salt stress during soybean seed germination.

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Authors and Affiliations

  1. National Center for Soybean Improvement National Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, 210095, China

    Xiao-yan Xu, Rui Fan, Rui Zheng, Chun-mei Li & De-yue Yu

  2. Foundation Department, Jiangsu Polytechnic College of Agriculture and Forestry, Jurong, 212400, China

    Xiao-yan Xu

  3. College of Life Sciences, Ningxia University, Yinchuan, 750021, China

    Rui Zheng

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  1. Xiao-yan Xu
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  2. Rui Fan
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  3. Rui Zheng
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  4. Chun-mei Li
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  5. De-yue Yu
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Correspondence to De-yue Yu.

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Project supported by the National Natural Science Foundation of China (No. 30800692), the National Basic Research Program (973) of China (Nos. 2010CB125906 and 2009CB118400), and the National High-Tech R & D Program (863) of China (No. 2006AA10Z1C1)

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Xu, Xy., Fan, R., Zheng, R. et al. Proteomic analysis of seed germination under salt stress in soybeans. J. Zhejiang Univ. Sci. B 12, 507–517 (2011). https://doi.org/10.1631/jzus.B1100061

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