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Studies on Improving Fruit Quality and Electing Indices for Stress and Atmosphere Modification Technology of postharvest and Breeding and Selection of Elite Genotypes with Quality Stability in Guava
番石榴( <I>Psidium guajava</I> L.)屬寒害敏感型熱帶水果，利用低溫貯運技術來維持品質與抑制病害受到大幅限制，無法長程運輸；且低溫檢疫處理後往往誘導寒害發生，嚴重阻礙行銷國際市場。本計畫探討改變大氣成份應用於番石榴採後保鮮的技術。擬進行測試不同氧氣與二氧化碳濃度對0℃貯運14天番石榴品質的影響，以尋求適合番石榴貯運的大氣成份，作為氣變包裝技術選擇包材的參考。並且初步以低密度聚乙烯與聚乙烯塑膠袋進行氣變包裝，充填氧氣3、5、7％與二氧化碳2.5、5％完全排列組合之 6種大氣成份，對低溫貯運番石榴品質的影響。計畫結果將有助於外銷番石榴低溫長期貯運與低溫檢疫處理問題的解決。
The harvested quality of guava fruits is poor in summer, ex. low total soluble solid and texture, due to fast growth rate in high temperature and high soil moisture. Our preliminary test showed that the PE bagging could fasten the growth rate of guava fruit, and paper or net bag replaced PE bag could slow the growth rate down. Extending growth period made the guava quality increase. In this study, we will advanced evaluate the application of bagging techniques. The second object is to establish the standard fertilization model in guava orchard through diagnosis by leaf and soil analytical methods. In addition, it is important to increase the tolerance of guava to stress from abnormal climate due to global warming. Breeding is a basic and simple method to increase the tolerance to stress. We will screen the method and index for stress tolerance in guava for increasing the efficiency of breeding. Guava ( <I>Psidium guajava</I> L.) is a chilling sensitve tropical fruit; therefore, the utilization of cold storage techique to maintain quality and suppress decay is highly limited. The fact that long term cold transportation and cold quarantine treatment usually render severe chilling injury impede exporting for international marketing. The project will investigate the effect of atmosphere modification technology on postharvest handling of guava fruit. Guava samples will be treated with different concentrations of oxygen and carbon dioxide at 0℃ for 14 days to observe the change of shelf life. Moreover, guava pack with DLPE and PE plastic bag and filled with oxygen 3, 5, 7％ and carbon dioxide 2.5, 5％ also evaluated for fruit quality change at 0℃ for 14 days. The results of this project will be beneficial for establishment of guava long-term cold transportation and cold quarantine technology, which are the bottle neck of guava fruit exporting process. The main purpose of the current project is to understand the variation among guava genotypes in terms of fruit quality and antioxidant activity assessment. Previously established F<SUB>2</SUB> populations as well as the progeny produced by crossing, selfing, or open pollination will be employed in trait evaluation, and the elite lines selected will be propagated. Furthermore, fruits at different developmental stages will be used for analyses of antioxidant activity and nitrite scavenging ability. In view of the probable effect of global warming on fruit production, the changes in fruit quality and antioxidant capacity among genotypes in different seasons will also be evaluated in this project.
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