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Studies on Improving and Stabilizing Fruits Quality by Nutrients Management, Postharsvet Technology, Genotype Identification and Derived Hybrid Selection in Guava
This study investigated four areas to establish the cultivation and management mode for guava. The first is the relationship between quality and leaf nutrient. The second is the effect of rootstock and cuttings on fruit quality and leaf nutrient. The third is the kinds of fertilizers for guava tree, the fourth is the relationship between photosynthetic characteristic and fruit quality in guava cultivars and fifth improvememnt of postharvest technology.However, guava belongs to chilling-sensitive group of horticultural products and, therefore, is intolerance to long-term transportation or
quarantine treatment in a low temperature condition. The purpose of this study is to investigate the effects of methyl jasmonate or methyl salicylate treatment on the reducing chilling injury of guava fruits, as well as to breakthrough the exportation bottleneck of guava fruit from Taiwan.Seedless cultivar bredding is important program in Taiwan,this project will continue the work from previous years in breeding for seedlessness, including cultivation of hybrid seedlings derived from [seedless x seeded] or [seedless x seedless] cultivars or lines, and trait evaluation of these hybrid seedlings. In addition, PCR-based molecular markers such as RAPD, ISSR and AFLP will be employed in this project to discriminate between the seedless lines or cultivars received from various sources and to establish the relationship between these seedless collections and commercial seeded cultivars. Molecular markers linked to the seedlessness and other important traits will be identified through marker analysis. The findings from this study will be valuable in guava cultivar identification and in enhancing the efficiency of breeding for seedlessness.
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