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Wound-response regulation of the sweet potato sporamin gene promoter region

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Abstract

Sporamin, a tuberous storage protein of sweet potato, was systemically expressed in leaves and stems by wound stimulation. In an effort to demonstrate the regulatory mechanism of wound response on the sporamin gene, a 1.25 kb sporamin promoter was isolated for studying the wound-induced signal transduction. Two wound response-like elements, a G box-like element and a GCC core-like sequence were found in this promoter. A construct containing the sporamin promoter fused to a β-glucuronidase (GUS) gene was transferred into tobacco plants by Agrobacterium-mediated transformation. The wound-induced high level of GUS activity was observed in stems and leaves of transgenic tobacco, but not in roots. This expression pattern was similar to that of the sporamin gene in sweet potatoes. Exogenous application of methyl jasmonate (MeJA) activated the sporamin promoter in leaves and stems of sweet potato and transgenic tobacco plants. A competitive inhibitor of ethylene (2,5-norbornadiene; NBD) down-regulated the effect of MeJA on sporamin gene expression. In contrast, salicylic acid (SA), an inhibitor of the octadecanoid pathway, strongly suppressed the sporamin promoter function that was stimulated by wound and MeJA treatments. In conclusion, wound-response expression of the sporamin gene in aerial parts of plants is regulated by the octadecanoid signal pathway.

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Authors and Affiliations

  1. Department of Botany, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipe 107, Taiwan

    Shu-Jen Wang, Yi-Ching Lan, Shih-Fung Chen, Yih-Ming Chen & Kai-Wun Yeh

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  1. Shu-Jen Wang
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  2. Yi-Ching Lan
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  3. Shih-Fung Chen
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  4. Yih-Ming Chen
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  5. Kai-Wun Yeh
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Wang, SJ., Lan, YC., Chen, SF. et al. Wound-response regulation of the sweet potato sporamin gene promoter region. Plant Mol Biol 48, 223–231 (2002). https://doi.org/10.1023/A:1013359227041

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