姜波 羅偉雄 張艷珍 馬崇堅 鐘云



DOI:10.13925/j.cnki.gsxb.20230236
摘? ? 要:仁選早柑是從貢柑田間優選單株中獲得的早熟柑橘新品種。在韶關地區種植,11月上中旬成熟,較貢柑早熟近1個月。果實近球形,平均單果質量78.07 g,果形指數為0.84,果皮黃橙色,較易剝皮,囊瓣整齊,果肉中等橙色,脆嫩化渣。果實可溶性固形物含量(w,后同)為14.0%,維生素C含量(ρ)為356 mg?L-1,總酸含量為0.52%,總糖含量為11.2%。對黃龍病不具抗性,易感褐斑病。豐產性好,5年生樹產量18 750~37 500 kg?hm-2。
關鍵詞:柑橘;新品種;仁選早柑;早熟
中圖分類號:S666.1 文獻標志碼:A 文章編號:1009-9980(2023)10-2279-04
A new early-ripening citrus cultivar Renxuanzaogan
JIANG Bo1, 2, LUO Weixiong4, ZHANG Yanzhen5, MA Chongjian3, ZHONG Yun1, 2*
(1Fruit Tree Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, Guangdong, China; 2Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization, Ministry of Agriculture and Rural Affairs/Guangdong Province Key Laboratory of Tropical and Subtropical Fruit Tree Research, Guangzhou 510640, Guangdong, China; 3Shaoguan University, Shaoguan 512000, Guangdong, China; 4Shaoguan Agricultural Science and Technology Promotion Center, Shaoguan 512000, Guangdong, China; 5Renhua County Agricultural and Rural Development Service Center, Renhua 512000, Guangdong, China)
Abstract: Gonggan is a local characteristic mandarin variety in Guangdong with a cultivation history of over 1100 years and a total cultivation area of approximately 26 667 m2. Breeding early maturing citrus varieties can solve the problem of inconsistent market quality caused by early harvest of citrus, and also avoid excessive concentration of market periods. In September 2017, Renxuanzaogan was found in an orchard where Gonggan was cultivated, in Renhua County, Shaoguan city by the Fruit Research Institute of the Guangdong Academy of Agricultural Sciences, Shaoguan University, Shaoguan Agricultural Science and Technology Extension Center, and Renhua County Agricultural and Rural Development Service Center. After three consecutive years of observation on biological characteristics, it was proved that its maturity period was one month earlier than the control Gonggan, with significant and stable differences existing. The certificate of Plant New Variety Rights was issued by the Ministry of Agriculture and Rural Affairs in 2023 (CNA20201005931). As is similar to the control variety Gonggan, this variety is susceptible to citrus huanglongbing and citrus brown spot disease. The tree posture of Renxuanzaogan is open. The spring shoots have short spines, with a length of 0.10 cm. The leaf blade is broadly lanceolate, with wavy edges, leaf shape index of 2.07, petiole length of 0.85 cm, and narrow winged leaves. The flower is white with 5 petals, 1.32 cm in length and 0.59 cm in width, and 13-16 filaments, partially united. The anthers are light yellow, and the style is arched, higher than the stamens. The fruit is nearly spherical, with a single fruit weight of 78.07 g and a fruit shape index of 0.84. The fruit surface is glossy, with flat oil cells. The fruit skin is yellow orange, with a thickness of 0.15 cm, which is easy to peel off. The core is semi-plump, and the segments are semi-lunar and neat. The segment membrane is thin and easy to separate, and the juice sacs are compact and spindle-shaped. The flesh color is uniform, with a medium orange color. The fruit edible rate is 73.86%, the fruit juice content is 48.89%, the soluble solids content is 14.0%, the total acid content is 0.52%, the total sugar content is 112 g·kg-1, and the vitamin C content is 356 mg·L-1. The number of seeds per fruit is 3-10, with wedge-shaped seeds, white cotyledons, and multiple embryos. There is a significant difference in the genome between Renxuanzaogan and the control of Gonggan. Compared with the genome of Clementine, Renxuanzaogan was identified as 2 874 326 SNPs and 588 506 InDels, while Gonggan was identified as 2 726 005 SNPs and 579 333 InDels. The differences in SNPs and InDels between Renxuanzaogan and Gonggan were 881 840 and 172 838, respectively, accounting for 32.35% and 29.83% of the total SNPs and InDels identified in Gonggan. This variety is suitable for cultivation in Gonggan cultivation areas with an annual average temperature of over 20 ℃ in Guangdong and Guangxi. Seedling breeding can use rootstocks such as trifoliate orange (Poncirus trifoliata Raf.), Suanju (Citrus reticulata Blanco), and Xiangcheng (C. junos). Planting disease-free container seedlings in new orchards can accelerate the formation of high-yield tree shapes. It is very important to prevent and control citrus huanglongbing. It is necessary to control the transmission of pests, such as citrus psyllid, whitefly and aphid during the shoot emergence period in spring, summer and autumn. When the temperature is between 20 ℃ and 28 ℃, the prevention and control of citrus brown spot disease is priority during the shoot emergence period in the rainy season.
Key words: Citrus; New cultivar; Renxuanzaogan; Early-ripening
貢柑是廣東省本地農家種。史料記載,在廣東省四會市從唐代就有貢柑種植,距今1100多年[1]。目前,在廣東德慶、仁化及廣西鐘山等地,貢柑是主栽品種,總面積約2.67萬hm2,是當地果農主要收入來源。
貢柑果實近球形,果皮橙黃,果肉淡橙色,較易剝皮。11月上中旬進入果實轉色期,此時果肉清甜,完熟后蜜味濃。受近年柑橘市場逐漸飽和的影響,多數本地主栽品種如砂糖橘、紅江橙等均在12月中旬開始集中上市,柑橘售價出現下滑。貢柑因轉色期(市場稱為“青果”)可上市,較其他中熟柑橘品種價格稍高。但“青果”隨著貢柑成熟期的變化,品質極不一致,影響市場對貢柑的消費信心,打壓后續上市成熟且優質貢柑的效益。現有基于芽變選種的柑橘品種多集中于無核性狀,如華柑四號[2]等。同樣,貢柑品種,如華蜜無核貢柑[3]、無籽貢柑[4]等也多集中于無核或少核性狀,未見成熟期較貢柑提前的品種。因此,選育出早熟貢柑品種顯得尤為重要,是解決“青果”上市品質不一的有效手段,也是避免上市期過于集中的有效途徑。
1 選育過程
2016年開始,廣東省農業科學院果樹研究所與韶關學院、韶關市農業科技推廣中心、仁化縣農業農村發展服務中心在韶關市聯合開展貢柑優異單株篩選。2017年9月在韶關市仁化縣下營村果園內發現一單株(編號G20170922)的果實較貢柑早轉色,即取其枝條與對照貢柑枝條同時嫁接于酸橘砧上。2018年4月將貢柑及單株G20170922種植于發現單株的同一果園內,2020年開始結果,同時按照《植物新品種特異性、一致性和穩定性測試指南 柑橘》(NY/T 2435—2013)開展田間測試。經過連續3 a(年)生物學特性觀察記錄,單株G20170922果實膨果期早、較貢柑早熟特性穩定,定名仁選早柑,2023年獲得農業農村部頒發的植物新品種權證書(CNA20201005931)(圖1)。
2 主要性狀
2.1 植物學特征
樹冠近圓形,樹姿開張。春梢節間長度1.40 cm,部分具短刺,刺長0.10 cm。葉片闊披針形,波狀緣,葉形指數2.07,基部楔形,尖端漸尖具缺刻,葉柄長0.85 cm,翼葉窄。花白色,花瓣5枚,長1.32 cm,寬0.59 cm,花絲13~16條,部分聯合,花藥淡黃,花柱弓狀,高于雄蕊。
2.2 物候期
在韶關,該品種3月上旬春梢抽發,3月上中旬開花,5月上中旬第一次生理落果,5月中下旬夏梢抽發,8月上中旬秋梢抽發,果實9月下旬至10月上旬轉色,11月上中旬成熟。豐產穩產,5年生樹產量18 750~37 500 kg·hm-2。
2.3 生長結果特性
果實近球形,平均單果質量78.07 g,果形指數0.84,果基圓形,果頂平,乳突不明顯,果面有光澤,油胞平,果皮黃橙色,厚度0.15 cm,較易剝皮,果心半充實,囊瓣半月形,整齊,9~12瓣,囊壁薄,較易分離,汁胞緊實,紡錘形,果肉顏色均勻,橙色,脆嫩較化渣。可食率73.86%,果汁含量(w,后同)為48.89%,可溶性固形物含量為14.0%,總酸含量為0.52%,總糖含量為11.2%,維生素C含量(ρ)為356 mg?L-1(表1)。單果種子數3~10粒,種子楔形,子葉白色,多胚。
2.4 抗逆性
連續3 a區域試驗表明,與對照品種貢柑一樣,該品種易感黃龍病,對褐斑病敏感。在網棚設施內栽培時,其產量較貢柑穩定。
3 全基因組重測序及分子鑒定
3.1 全基因組重測序
提取貢柑、仁選早柑基因組DNA,送北京百邁客生物科技有限公司(Biomarker Technologies)采用Illumina測序平臺進行高通量測序,測序深度為10X,以克里曼丁橘(與貢柑同為橘橙雜交種)為參照,與克里曼丁橘基因組比較,仁選早柑鑒定出2 874 326個SNPs,588 506個InDels,貢柑則鑒定出2 726 005個SNPs,579 333個InDels(表2)。仁選早柑與貢柑二者間差異SNPs、InDels分別為881 840個、172 838個,分別占貢柑鑒定出SNPs、InDels總數的32.35%、29.83%。可見,仁選早柑與對照貢柑基因組間差異大。
3.2 仁選早柑與貢柑的SSR分子鑒定
提取仁選早柑與貢柑DNA,采用SSR方法并參照郭雁君等[5]的報道,引物為CMS30:F(5-AACACCCCTTGGAGGGAG-3),R(5-GCTGTTCACACACACAACCC-3)。如圖2所示,在200~300 bp之間,仁選早柑與對照貢柑PCR產物電泳條帶差異明顯。
4 栽培技術要點
4.1 適栽區
該品種適宜在廣東、廣西年均溫20 ℃以上的貢柑種植區域種植。建園應選擇水源豐富的緩坡地,避免在低洼濕潤的小盆地區域種植。為延緩柑橘黃龍病的傳播,優選周邊無九里香、柑橘等蕓香科植物種植的區域建園,或設置適當的防風林或防風帶。苗木繁育可使用枳、酸橘、香橙等作砧木。新建果園種植無病容器大苗可加速形成豐產樹形,獲得經濟產量。
4.2 水肥管理
幼齡樹施肥應勤施薄施,促成樹冠。成年樹在夏梢抽發期加強樹體營養管理,避免落果。
4.3 病蟲害防治
做好柑橘黃龍病防控,并在春、夏、秋梢抽發期做好傳病蟲媒介柑橘木虱、粉虱及蚜蟲的防治。在新梢抽發期若遇雨季,尤其是氣溫處于20~28 ℃時,應注意加強柑橘褐斑病的防治。
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收稿日期:2023-06-16 接受日期:2023-07-09
基金項目:廣州市農村科技特派員項目(20212100063);廣東省重點研發計劃項目(2018B020202009);廣東省柑橘杧果產業技術體系創新團隊建設項目(2023KJ108)
作者簡介:姜波,副研究員,碩士,主要從事柑橘等果樹新品種選育及栽培技術研究。Tel:13580522512,E-mail:13580522512@126.com
通信作者 Author for correspondence. Tel:020-38765854,E-mail:zhongyun99cn@163.com