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Profiles of gene family members related to carotenoid accumulation in citrus genus
Xu Wei,Hao Hu,Huarong Tong,Frederick G. Gmitter Jr. 한국식물학회 2017 Journal of Plant Biology Vol.60 No.1
Citrus fruit are an important reservoir of carotenoids. Numerous studies have been carried out to identify and profile the members of gene families involved in carotenoid biosynthetic pathway to explain the diversity of coloration in citrus fruit. It was found that gene expression analysis could not always explain the changes in carotenoid content and composition, indicating that other unknown genes and mechanisms should be operative. This review summarizes and updates the current knowledge on gene families involved in the citrus carotenoid biosynthetic pathway and their roles on the regulation of carotenoid biosynthesis, as well as provides insightful questions leading to future experimentation.
Grosser, Jude W.,An, Hyun Joo,Calovic, Milica,Lee, Dong H.,Chen, Chunxian,Vasconcellos, Monica,Gmitter, Frederick G. American Society for Horticultural Science 2010 HortScience Vol.45 No.8
<P>Somatic hybridization through protoplast fusion has proven to be a valuable technique in citrus for producing unique allotetraploid breeding parents that combine elite diploid selections. Many citrus somatic hybrids are now flowering and being used in interploid crosses to generate triploid hybrids that produce seedless fruit, a primary objective of citrus breeding programs. Most of the early somatic hybrids produced for mandarin improvement combined sweet oranges with mandarins, because the performance of sweet oranges in tissue/protoplast culture generally exceeds that of most mandarin selections. However, a high percentage of triploid progeny from interploid crosses using sweet orange + mandarin somatic hybrids as the tetraploid parent produce fruit that are difficult to peel. We report nine new allotetraploid somatic hybrids and five new autotetraploids from somatic fusion experiments involving easy-peel mandarin parents. These tetraploids can be used in interploid crosses to increase the percentage of seedless triploid progeny producing easy-to-peel fruit. Ploidy level of the new tetraploids was determined by flow cytometry and their genetic origin by expressed sequence tag-simple sequence repeat marker analysis.</P>
만다린 잡종에서 자연발생 배수체의 발생 빈도와 생장 특성
송관정(Kwan Jeong Song),김샛별(Sat Byul Kim),박재현(Jae Hyun Park),오은의(Eun Ui Oh),이경욱(Kyunguk Lee),김동욱(Dong Wook Kim),강종훈(Jong-Hoon Kang),김정순(Jeong-Soon Kim),오정환(Jeong Hwan Oh),Fred G. Gmitter 한국원예학회 2011 원예과학기술지 Vol.29 No.6
The study was conducted to determine the efficiency in producing spontaneous polyploids in some mandarin hybrids with different seed embryony. Seed formation by open pollination, frequency of spontaneous polyploids, and plant growth characteristics were evaluated in four mandarin hybrids with polyembryony such as Amakusa, Haruka, Hayaka, and Seminole and two with monoembryony such as Benibae and Harehime. The mean number of the developed seeds per fruit was 10.0 and frequency of small seeds was 25.1%. Polyploids were selected from plants germinated in vitro by a flow cytometry and confirmed by chromosome analysis. One triploid was produced from Harehime, one tetraploid, Amakusa, and one tetrapoid, Benibae. There were little differences in leaf shape, thickness, petiole length, and internode length between diploids and polyploids such as tri- or tetraploid. However, polyploids had larger stomata and lower density of stomata in abaxial epidermis than diploids. SPAS indicating chlorophyll con tent and photosynthetic rate were significantly affected by ploidy level. The results indicated that spontaneous polyploids might be produced by open pollination in some mandarin hybrids and monoembryony had higher frequency in polyploid occurrence than polyembryony.