期刊
PLANT GROWTH REGULATION
卷 48, 期 2, 页码 187-193出版社
SPRINGER
DOI: 10.1007/s10725-005-6112-z
关键词
1-MCP; Ethanol; GA(3); Green asparagus; Lignification
To understand how lignin synthesis is regulated after harvest, detached green asparagus stalks (Asparagus officinalis L.) were treated with 1 mu l l(-1) of 1-methylcyclopropene (1-MCP), 50 mu g l(-1)(GA(3)), 2% (v:v) ethanol or 1 mu l l(-1) ethylene. The results showed that lignin concentration in asparagus stalks stored at room temperature rapidly increased. Three conventional precursors of lignin, 4-hydroxycinnamic acid (coumaric acid), 3,4-dihydroxycinnamic acid (caffeic acid) and 4-hydroxy-3-mythoxycinnamic acid (ferulic acid), were found to be the major phenolics in the asparagus stalks. Furthermore, the concentrations of O-2(-.) in asparagus stalks steadily increased during the storage. Deposition of lignin in harvested asparagus was significantly reduced by treating the stalks with GA(3), 1-MCP or ethanol. The concentration of lignin in stalks treated with GA(3), 1-MCP or ethanol was 32, 20 or 27% lower, respectively, than in controls 3 days after treatment. Treating stalks with ethylene enhanced lignin synthesis (p < 0.05). The concentration of total phenol in stalks was also significantly reduced by GA(3), 1-MCP and ethanol, but was enhanced by ethylene treatment. However, the concentration of active oxygen (O-2(-.)) in stalks was significantly reduced by treatment with GA(3), 1-MCP and ethanol, but was enhanced by treatment with ethylene. Our study show that postharvest treatment with 1-MCP, GA(3) or ethanol may be applied to improve the quality of green asparagus.
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