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  • Title: Transformation of a marker-free and vector-free antisense ACC oxidase gene cassette into melon via the pollen-tube pathway.
    Author: Hao J, Niu Y, Yang B, Gao F, Zhang L, Wang J, Hasi A.
    Journal: Biotechnol Lett; 2011 Jan; 33(1):55-61. PubMed ID: 20865442.
    Abstract:
    Melons have short shelf-lives due to fruit ripening caused by ethylene production. The 1-aminocyclopropane-1-carboxylic acid (ACC) oxidase gene is essential for ethylene biosynthesis. As fruit ripening in other fruit crops can be deterred by down-regulation of ACC oxidase expression, we have carried out similar work to improve fruit quality and shelf-life of the melon Cucumis melo. A marker-free and vector-free antisense 1-aminocyclopropane-1-carboxylic acid oxidase construct was transformed into melon via the pollen-tube pathway. Based on phenotype analysis together with RT-PCR data, a transformation frequency of 0.7% was achieved. The transgenic fruits showed respiration rate and endogenous ethylene production level at approx. 15 and 6% of those of wild-type fruits, respectively. These fruits also demonstrated improved flesh firmness and exhibited extended shelf-life of 30 days compared to less than 12 days for the wild type fruits.
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