China is one of the main countries in the world in which citrus species are cultivated. Today, the annual production of citrus fruit in China has reached about 10,000,000 tonnes. The chemical composition of citrus leaf oils of Chinese origin has not yet been systematically studied, although some specific species or varieties have been studied and reported. We carried out systematic analytical studies on the composition of the leaf oils from 110 citrus species, varieties, hybrids and cultivars of Chinese origin in order to look for new resources for essential oils and provide the systematic chemical-composition data of the leaf oils for the taxonomy of citrus plants. In this article, we report the experimental results of this study.
Experiment Analyses were carried out on 110 citrus species, varieties, hybrids and cultivars of Chinese origin. The citrus taxa studied were three species of papeda: Citrus macroptera Monter. (MAC), C. hongheensis Y.L. D.L. (HON) and C. hystrix D.C. (HYS); twelve species and cultivars of Osmocitrus (yuzu etc.), C. junos (Sieb.) Tan. cultivars: Xiecheng (JXI), Luohangcheng (JLU), Wangchangxiancheng (JWA), Mitaoxiancheng (JMI), Tangcheng (JTA), Nippon Xiancheng (JNX), Jiangbeixiancheng (JJI), Chanju (JCH) Zhencheng (JZH), and Bazhongxiancheng (JBA); C. wilsonii Tan cultivars: Zhejiangyuan (WZH) and Wangchangxianyuan (WWA); seventeen cultivars and one variety of C. aurantium L. (bitter orange), C. aurantium L. cultivars: African (AAF), Brazilian (ABR), Spanish (ASP), Morocco (AMO), Italian (AIT), Bangan (ABA), Daidai (ADA), Xingshan (AXI), Bittersweet (ABS), Anti-Blight (AAB), Rubidoux (ARU), Autstralian (AAU), Guangpi (AGU), Zhulan (AZH), Goutou (AGO )and Jiangjin (AJI); C. aurantium var. myrtifolia Ker Gawl. (AMY), C. taiwanica Tan. ex Shimada (TAI); eleven (GRR) and (GRE); C. limon x C. grandis (LGR), C. grandis x C. junos (GRJ); C. grandis x Poncirus trifoliata Raf. (GPT); eighteen species, varieties and cultivars of Microacrumen (tangerine) C. tangerina cultivars: Chuanju (TCH), Dancy (TDA), and Fuju (TFU); C. chuana Hort. ex Tan. (CHU); C. suhuiensis Hort. ex Tan. (SUH); C. ponki Hort. ex. Tan. (PON); C. succosa Hort. ex Tan. (SUC); C. compressa Tan. (COM); C. tandiferax Hort. ex Tan. (TAN); C. chachiensis Hort. ex Tan. (CHA); C. sunki Hort. ex Tan. (SUN); C. reticulata cultivars: Sihuishiyueju (RSI), Poonensis (RPO), Vietnamese (RVI), Jushaxianggan (RJU) and Daxianggan (RDA); C. erythrosa Hort. ex. Tan. (ERY); C. kinokuni Hort. ex Tan. (KIN); C. tachibana Tan. (TAC), and eleven species and cultivars of Macroacrumen (mandarin), C. clementina Hort. ex Tan. (CLE); C. suavissima Hort. ex. Tan. (SUA); C. vessucosa Hort. ex Tan. (VES); C. nobilis Lour. cultivars: Wanggan (NWA) and Bendiguanju (NBE); C. unshiu Marc. cultivar Wenzhang (UWE); C. tankan Hayata (TAK); C. iyo Hort. ex Tan. (IYO); C. sulcata Hort. ex Tan. (SUL); C. hassaku Hort. ex Tan. (HAS), and C. madurensis Lour. (MAD). cultivars and four hybrids of C. sinensis Osbeck (sweet orange), C. sinensis Osbeck cultivars: Taoyecheng (STA), Huangbaipitiancheng (SHU), Gailiangcheng (SGA), Jincheng (SJI), Hamlin (SHA), Washington (SWA), Ruby Blood (SRB), Valencia (SVA), Liucheng (SLI), Xuegan (SXU) and Xinhuicheng (SXI), C. sinensis x C. reticulata Blanco hybrids: (SIR), (SRE) and (SXR)and C. sinensis x C. grandis Osbeck (SGR); sixteen species and cultivars of Citrophorum (citron and lemon): C. medica L. (CME), C. medica var. sarcodactylis (Noot.) Swing. (MSA), C. medica var. ethrog Engl. (MET); C. limon Burm. f. cultivars: Eureka (LEU), Lisbon (LLI), Verna (LVE) and Botswana (LBO); C. aurantifolia Swing. cultivars: Mexico (AME), Tahiti (ATA and Ponderosa (APO); C. limonia Osbeck var. meyers lemon Wong (LML), C. limonia Osbeck (LMN); C. limonia cultivar Honglimeng (LHO); C. limettioides Tan (LIM); C. jambhiri Lush. (JAM); C. bergamia Risso et Poit. (BER); sixteen species, cultivars and hybrids of Cephalocitrus (shaddock and grapefruit), C. paradisi Macf. cultivars: Marsh (PMA) and Duncan (PDU); C. grandis Osbeck cultivars: Shatianyou (GSH), Wubuhongxingyou (GWU), Chumenweidanyou (GCH), Xianluomiyou (GXI), Dianjiangbaiyou (GDI), Cuba (GCU), Jinxiangyou (GJI) and Madoumendanyou (GMA); C. paradisi x C. tangerina Hort. ex Tan. (PAT), C. grandis x C. reticulata hybrids