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|標題:||Studies on Improving Fruit Quality and Electing Indices for Stress and Breeding and Selection of Elite Genotypes with Quality Stability in Guava
|關鍵字:||guava;番石榴;園藝;chilling tolerance;heat tolerance;chlorophyll fluorescence;electron leakage;mineral nutrition;Breeding;antioxidant activity;molecular markers;fruit quality;耐寒性;耐熱性;葉綠素螢光;電導度;礦物營養;育種;抗氧化力;分子標記;果實品質;技術發展||摘要:||
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. The objectives of the current project include cultivar improvement, antioxidant activity assessment, and genotype-specific marker development in guava. Because of the demand for diversified cultivars, characteristics such as red flesh, climacteric fruit, heat tolerance and high antioxidant activity in addition to seedlessness will be evaluated in breeding for new cultivars. Previously established F2 populations as well as the progeny produced by crossing, selfing, or open pollination will be employed in trait evaluation and elite line selection. From these materials, several breeding lines will be chosen to investigate quality stability of fruit harvest in different seasons. Furthermore, the fruits of these breeding lines, particularly those from F2, will be used for analyses of antioxidant activity and nitrite scavenging ability. In view of the importance of molecular markers in genotype identification, the work of establishing fingerprinting database and developing genotype-specific molecular markers will also be continued in this project.
|Appears in Collections:||園藝學系|
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