本試驗調查番石榴幼果採收後果實褐化的發生與乙烯間之關係。'梨仔拔'和'水晶拔'幼果採收後果皮逐漸變暗，由深綠色轉變為紅褐色，且二品種皆具有假性更年性(Pseudo-climacteric)的現象，並出現乙烯高峰。但當乙烯釋放率明顯上升時，酚類化合則有下降之趨勢，再以AVG及l-MCP處理幼果皆無法有效抑制果實褐化，此結果顯示，幼果採收後的褐化可能和乙烯產生無直接相關。此外，幼果採收後酚類化合物有累積現象，可能由於新陳代謝加速，促進老化，造成細胞內胞器間膜之區隔作用消失，造成褐化反應，而使幼果產生褐化現象。The objectives of this experiment were to investigate the ethylene biosynthesis and browning reactions of harvested guava fruitlets. 'Shui-Jing' and 'Li-Tzy Bar' fruitlets after harvest possessed pseudo-climacteric phenomenon with apparent peak ethylene release and accompanied peel browning. Since AVG (inhibitor of ethylene biosynthesis) and 1-MCP (inhibitor of ethylene action) treatments had no alleviation effect indicating the browning of harvested fruitlets had nothing to do with ethylene per se. in addition, phenolic compound was accumulated of fruitlets after harvest. The results suggest that owing to high catabolism and senescence induced membrane breakdown and browing reactions of fruit let after harvested
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