To Breed Potted Fragrant Hibiscus by Hibiscus arnottianus

• Main Authors: Tzu-Yin Kuo, 郭姿吟
• Other Authors: Chien-Young Chu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/79441512075188423959

碩士 === 國立中興大學 === 園藝學系所 === 100 === This researches Hibiscus arnottianus was used to cross with Hibiscus cultivars. Furthermore, the offsprings were backcross in order to breed fragrant pot hibiscus. The pollen of Hibiscus ‘Kyoto’, H. arnottianus and ‘their hybrids were cultured in vitro. The rate of ‘Kyoto’ pollen germinated on the medium containing 30% sucrose was at 2.6%. It was higher than 1.6% or 1.1%, when of ‘Kyoto’ pollen germinated on the medium containing sucrose at 28% or 20%, respectively. Otherwise, the pollen germination rate of H. arnottianus was at 1.6%, when it germinated on the medium containing 25% sucrose. H. arnottianus pollen germinated on medium with various sucrose, the germination rate was lower than 0.8%. The fruiting of H. arnottianus as pollen parent crossed with Hibiscus cultivars was dependent on cultivars. For examples, corssing with ‘Izume’, ‘Sapporo’ or ‘Emily’ the fruiting rate was over 50%. But crossing with ‘South Sea’or ‘Kenny’ the fruiting rate was 12% or 10%, respectively. On the other hand, H. arnottianus as mother parent crossed with ‘Emily’ or ‘Oriental Moon’ the fruiting rate was 6% or 16%, respectively. In addition, the higher seeding rate of crossing were ‘Kenny’× H. arnottianus at 32.1%, ‘Izume’× H. arnottianus at 20.1% and ‘KA98-1’×H. arnottianus was at 11%. From the offsprings population, three plants, such as ‘Kyoto×A.（H. arnottianus） 101’, ‘Flame×A 101’ and ‘Emily×A-101’, were selected. The plants were cloned by cutting and were inspected by DUS test of UPOV. After pinch, the branches of ‘Kyoto×A 101’ or ‘Flame×A 101’ were increased from 0.8 to 6.2 or from 1.0 to 4.4, respectively. Chlormequat inhibited the growth of plant height, internode and leaves. In addition the application of Chlormequat was need higher concentration or more times, the retardant effect was more on plant.