Ethephon對綠豆芽生長之影響

Effect of Ethephon on the Growth of Mungbean Sprouts

綠豆芽經Ethephon噴施後能抑制根部生長，促進下胚軸肥大。在25±2 °C及每3小時灌水一次的生長環境下，其適量濃度為1O～20 ppm，於下種後24小時，根部長度約1.5 cm，下胚軸長度約0.8 cm時開始，每間隔24小時噴施一次，連續三次，並於下種後96小時收穫，可得根短莖粗立最佳效果。若於下種後24小時以10 ppm噴施第一次，間隔36小時再次20 ppm噴施第二次，其效果亦甚良好，並提早1O～18小時收獲。在整個綠豆芽生長期間只噴施一次者，無論施藥時間的遲早，效果均不理想，早期施藥則其形狀呈現頭大尾小，晚期施藥則呈頭小尾大之現象。由試驗結果顯示在適量濃度下，根部之生長遠比下胚軸容易受到藥劑抑制。

Ethephon treatment increased the diameter of hypocotyl, and retarded the tap root growth of mungbean sprouts. At the optimum temperature at 25 ± 2°C, with water supplied for every 3 hours, the most desirable treatment concentration was found to be 1O~20 ppm. Better resuts were obtained by three application of Ethephon at intervals of 24 hours beginning at 24 hours after seed sowing, or by one application of 10 ppm Ethephon at 24 hours after sowing, following by one applkation of 20 ppm Ethephon at 36 hours thereafter. Results were generally not fovourable with one application of Ethephon. Early treatment induced uneven growth of hypocotyl and enhanced the development of branch roots. While late treatment failed to reduce the length of roots, but promoted uneven growth of hypocotyl. Results indicated that at suitable concentration, the growth of roots were susceptibly inhibited than the hypocotyl by Ethephon treatment.