牟建莉 黃晗羽 陳夢(mèng)潔 唐育輝 王仁才 羅飛雄
收稿日期:2023-09-08 接受日期:2023-11-13
基金項(xiàng)目:國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2022YFD1200503);國(guó)家現(xiàn)代農(nóng)業(yè)產(chǎn)業(yè)技術(shù)體系項(xiàng)目(CARS-29-zp-9)
作者簡(jiǎn)介:牟建莉,女,在讀碩士研究生,主要從事果樹遺傳育種研究。E-mail:1356826113@qq.com
*通信作者Author for correspondence. E-mail:409600160@qq.com;E-mail:781304265@qq.com
DOI:10.13925/j.cnki.gsxb.20230352
摘? ? 要:湘獼棗是從湖南瀏陽(yáng)市大圍山野生軟棗獼猴桃群體中選育出的新品種。果實(shí)呈長(zhǎng)柱形,果肉綠色,成熟后果皮呈紫紅色,種子附近果肉呈紫紅色。果皮光滑無毛,表面蠟質(zhì)具果粉。平均單果質(zhì)量為25.18 g,最大單果質(zhì)量為28.33 g,果形指數(shù)為1.37?;ê?00 d采收時(shí)的可溶性固形物含量(w,后同)為13.13%,總酸含量為1.13%,后熟期果實(shí)可溶性固形物含量最高可達(dá)26.5%,平均可溶性固形物含量為23.34%,干物質(zhì)含量為22.28%。單個(gè)果實(shí)平均含有種子130粒,維生素C含量為36 mg·100 g-1,果柄長(zhǎng)度為11.14~26.29 mm。該品種抗逆性強(qiáng),潰瘍病抗性強(qiáng)于米良1號(hào),可作為鮮食和加工品種。
關(guān)鍵詞:軟棗獼猴桃;新品種;湘獼棗;抗?jié)儾?/p>
中圖分類號(hào):S663.4 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1009-9980(2024)01-0187-06
Breeding report of a new Actinidia arguta cultivar Xiangmizao
MOU Jianli1, HUANG Hanyu1, CHEN Mengjie1, TANG Yuhui2, WANG Rencai1*, LUO Feixiong1*
(College of Horticulture, Hunan Agricultural University, Changsha 410128, Hunan, China; 2Yulin Fruit Production Professional Cooperative of Liuyang City, Changsha 410308, Hunan, China)
Abstract: Xiangmizao is a new tara vine cultivar, which was selected from the wild tara vine population growing at Dawei Mountain, Liuyang city, Hunan province. In early May of 2011, this single individual was propagated via cuttings or grafting, and cuttings were grafted on individuals of Actinidia deliciosa collected from Dawei Mountain. After 6-year field trial, clones of this individual showed stable performance for all horticultural attributes. The tree vigor is moderate and most new shoots grow out in spring. These new shoots are purple red with dense white lenticels distributing on the surface. Newly formed leaves are yellowish green with red tips. Mature leaves are dark green with red petioles and ovate blades with serrated edges. The inflorescence is dichasium. The long columnar berry shows green skin and flesh just after harvest. Berry skin becomes purplish red after storage and berry flesh near seeds is purplish-red. Berry skin is smooth and covered with fruit wax. The berry shape index is 1.37, the average berry weight is 25.18 g, and the maximum berry weight is 28.33 g. Soluble solids content of berry is 13.13% at just harvest time. The total acid content is 1.13%, the soluble solids content could reach up to 26.50% after storage, and the average soluble solids content is 23.34% and the dry matter content is 22.28%. The average seed number is about 130 per berry. The vitamin C content is 36 mg per 100 g fresh weight, and the fruit stalk is 11.14-26.29 mm in length. The proper harvesting period is mid to late August, which is slightly earlier than early season and red-fleshed A. chinensis cultivar Hongyang. This individual performs consistently and stably through six-consecutive-year field trial from 2017 to 2023. The individual is mainly propagated by asexual propagation methods such as hardwood cuttings, softwood cuttings and grafting. This desirable individual prefers growing environment with shading and cool climate. This new cultivar is suitable to be planted in areas with higher altitudes and relatively cool climate. Xiangmizao is mainly planted in a terraced orchard at Dawei Mountain Scenic Area with 650 meters altitude in Liuyang city. The proper male pollinator has been selected for this new cultivar, which is a male individual collected from Dawei Mountain. This male pollinator shows the overlapped blooming time with Xiangmizao and produces relatively large number of flowers with quality pollen resulting in the best fruit quality for this female cultivar. Irrigation mainly adopts drip irrigation and soil is covered with grass residuals to collect rainfall. Irrigation needs to be carried out according to rainfall and fertilizer application schedule. The vine of Xiangmizao is trained into an open-heart system without supporting trellis. In spring and summer, actively growing shoots are required to be pinched in time to maintain the balance of vegetative-reproductive growth. Protection facilities or practices from possible low temperature are not required in winter at the Dawei Mountain growing area and the new cultivar could naturally live through the winter at 650 meters in altitude. This new A. arguta cultivar has showed resistance to various biotic and abiotic environmental factors, and particularly its resistance to kiwifruit bacterial canker is better than Miliang No. 1, a major kiwifruit cultivar grown in Hunan province. Xiangmizao is suitable for both fresh-eating and processing.
Key words: Actinidia arguta; New cultivar; Xiangmizao; Bacterial canker resistance
中國(guó)軟棗獼猴桃分布范圍較廣,主要分布于東北、華北、西北、長(zhǎng)江流域以及臺(tái)灣地區(qū),東北軟棗獼猴桃種質(zhì)資源最為豐富[1]。軟棗獼猴桃果實(shí)表面光滑無毛,大部分果皮為綠色,維生素C含量較高,果實(shí)較美味獼猴桃系列品種小,是一個(gè)經(jīng)濟(jì)潛力巨大的種。相較于美味獼猴桃和中華獼猴桃,軟棗獼猴桃品種相對(duì)較少,其果皮較薄、貯藏性差,國(guó)內(nèi)選育的優(yōu)良軟棗獼猴桃品種主要分布在東北地區(qū),如泉蜜[2]、丹陽(yáng)[3]、馨綠[4]、魁綠[5]、佳綠[6]等。其他地區(qū)品種較少,如華中地區(qū)獼棗2號(hào)[7]和金香紅[8],西南地區(qū)的寶貝星[9]等。軟棗獼猴桃雖然比較耐寒,但其花芽分化需要一定的需冷量,從東北地區(qū)引入華中、華南地區(qū)的品種可能會(huì)因冬季需冷量不足而影響花芽分化。軟棗獼猴桃后熟期短,不耐運(yùn)輸,東北產(chǎn)區(qū)的軟棗獼猴桃果實(shí)運(yùn)輸?shù)饺A中、華南地區(qū)難以保持品質(zhì)。因此,加強(qiáng)選育適宜華中、華南地區(qū)栽培、貨架期長(zhǎng)、耐貯性強(qiáng)、外形美觀的優(yōu)良軟棗獼猴桃新品種可促進(jìn)軟棗獼猴桃產(chǎn)業(yè)在長(zhǎng)江以南地區(qū)的發(fā)展。
1 選育過程
2010年,在湖南省長(zhǎng)沙市瀏陽(yáng)市大圍山海拔1300 m處發(fā)現(xiàn)1株表現(xiàn)優(yōu)異的軟棗獼猴桃單株。2011年5月初,通過扦插或嫁接對(duì)該優(yōu)異單株進(jìn)行擴(kuò)繁,選取采自大圍山的野生美味獼猴桃作為砧木,在大圍山海拔650 m左右山地建園種植。通過多年試驗(yàn),該品種各項(xiàng)農(nóng)藝性狀表現(xiàn)穩(wěn)定,其果實(shí)成熟后果皮及種子附近果肉為紫紅色。通過使用7個(gè)簡(jiǎn)單重復(fù)序列標(biāo)記(simple sequence repeat,SSR)[10]鑒定該優(yōu)異單株,結(jié)果表明與其他軟棗獼猴桃相比,存在顯著遺傳差異。果實(shí)采收期為8月中下旬,稍早于中華獼猴桃紅陽(yáng)。通過2017—2023年連續(xù)7 a(年)田間觀察評(píng)價(jià)測(cè)試,該單株的綜合農(nóng)藝性狀表現(xiàn)一致且穩(wěn)定。2020年9月獲得國(guó)家植物新品種權(quán)證書,命名為湘獼棗,品種授權(quán)號(hào):CNA20172705.1。
2 主要性狀
2.1 生物學(xué)特性
2.1.1 樹勢(shì)和枝條生長(zhǎng)狀態(tài) 當(dāng)年生枝條為灰白色,樹勢(shì)偏弱,以春梢為主。新梢和1年生枝條為紫紅色,枝條表面分布白色皮孔較為明顯。1年生枝條較細(xì),皮孔多且較大,呈長(zhǎng)梭形(圖1-A),新梢顏色較1年生枝深,無茸毛、表面光滑(圖1-B)。
2.1.2 葉片性狀和顏色 幼葉尖端為紅色,葉片為黃綠色。成熟葉片為深綠色,葉柄為紅色,隨著葉脈向葉片延伸,紅色逐漸變淺。成熟葉片為卵圓形,邊緣具鋸齒,葉痕較深。幼葉尖端極尖,葉片無茸毛(圖1-B)。
2.1.3 花序類型及顏色 湘獼棗花序?yàn)槎缇蹅慊ㄐ?,花序花朵?shù)量較多(圖1-C)?;ò隇榘咨?,花瓣數(shù)為5個(gè)。湘獼棗的花藥為灰黑色,花絲和花柱為白色,花柱水平。萼片基部為綠色,尖端為紫紅色。湘獼棗的花從結(jié)構(gòu)上看是具有雌蕊和雄蕊的完全花,但雄蕊敗育產(chǎn)生無生活力的花粉。使用碘-碘化鉀染色法及花粉萌發(fā)檢測(cè)表明花粉無活力[11],人工授粉坐果率為75.13%。
2.2 果實(shí)特征
2.2.1 果實(shí)形態(tài)觀察 果實(shí)為長(zhǎng)柱形,果實(shí)后熟后使用色差儀檢測(cè)果皮顏色[12-13],果皮呈紫紅色,果肉顏色為綠色,種子周圍的果肉為紫紅色(圖2)。果實(shí)表面光滑無毛,表面具蠟質(zhì),無棱,果皮帶果粉。果實(shí)帶有濃香,肉質(zhì)多汁可口。單果質(zhì)量19.93~28.33 g,縱徑37.12~45.51 mm,橫徑24.32~33.35 mm,果形指數(shù)為1.37?;ê?00 d采收時(shí),可溶性固形物(w,后同)含量為13.13%,總酸含量為1.13%,后熟果實(shí)可溶性固形物含量最高可達(dá)26.5%,平均可溶性固形物含量為23.34%,總酸含量為1.12%(表1)。單個(gè)果實(shí)平均種子數(shù)為130粒,果柄長(zhǎng)度為11.14~26.29 mm,維生素C含量為36 mg·100 g-1。
2.2.2 果實(shí)生長(zhǎng)動(dòng)態(tài)? ? 盛花期授粉后,花后7 d開始,分別在花后7、14、21、28、35、42、49、59、69、79、89 d測(cè)量一次果實(shí)縱橫徑。果實(shí)縱徑、橫徑在生長(zhǎng)初期增長(zhǎng)較快,后期不增長(zhǎng)或增長(zhǎng)較慢(圖3-A)。果實(shí)生長(zhǎng)初期顏色為黃綠色,隨著果實(shí)生長(zhǎng)黃色逐漸減少,果實(shí)由黃綠色轉(zhuǎn)為翠綠色,后熟后果實(shí)轉(zhuǎn)色為紫紅色(圖3-B)。
2.2.3 果實(shí)采后表現(xiàn) 采收時(shí)果皮顏色為翠綠色,后熟6 d后,果皮由綠色轉(zhuǎn)為紫紅色(圖2-B)。C*值從21.82下降至9.4,h°從178.52下降至0.99(表2),表示果皮顏色由綠色轉(zhuǎn)變?yōu)榧t色。果皮顏色由采收時(shí)亮度高的綠色轉(zhuǎn)變?yōu)榱炼鹊颓野党恋募t色?;ê?00 d左右,果實(shí)種子變褐,可溶性固形物含量為8%~13%,干物質(zhì)含量≥15%時(shí)采收果實(shí)風(fēng)味最佳。后熟后可溶性固形物含量最高可達(dá)26.5%,硬度為2.4 N,干物質(zhì)含量為22.28%,果實(shí)采收后可常溫貯藏5~7 d。
2.3 湘獼棗遺傳特異性鑒定
經(jīng)流式細(xì)胞儀測(cè)定湘獼棗為四倍體,使用7個(gè)SSR標(biāo)記檢測(cè)湘獼棗的遺傳特異性,這7個(gè)標(biāo)記分別為UDK-096、UDK-103、UDK-125、UDK-128、UDK-143、UDK-154和UDK-158[10],根據(jù)標(biāo)記位點(diǎn)遺傳多態(tài)性信息使用PowerMarker[14]和MEGA11[15]進(jìn)行聚類分析,用算術(shù)平均法(UPFMA)進(jìn)行聚類分析,通過Tree plot模塊生成聚類圖(圖4)。
結(jié)果表明湘獼棗與其他軟棗獼猴桃存在顯著遺傳差異。湘獼棗與采自大圍山其他野生軟棗獼猴桃單株聚類在一起,中華獼猴桃聚為一大類,京梨獼猴桃和毛花獼猴桃分別單獨(dú)聚為一類。
2.4 物候期觀察
湖南省瀏陽(yáng)市大圍山在海拔650 m處建果園,通過2017—2023年共計(jì)7 a田間觀察,湘獼棗植株4月中旬左右萌芽,展葉抽梢,4月底現(xiàn)蕾,5月初開花,8月中下旬果實(shí)達(dá)到采收成熟度,落葉期為10月下旬。
3 栽培技術(shù)要點(diǎn)
3.1 苗木繁殖
以硬枝扦插、嫩枝扦插、嫁接等無性繁殖方式為主,也可采用嫩枝莖段作為外植體的方式,通過組織培養(yǎng)生產(chǎn)脫毒苗。
3.2 建園
建園宜選擇山地陰涼、黏沙質(zhì)土壤、靠近水源、排灌方便的地方建園。建議湘獼棗在海拔較高地區(qū)建園,該品種在長(zhǎng)沙市低海拔區(qū)(海拔<50 m)果園表現(xiàn)為生長(zhǎng)量過小,成花率降低。建園時(shí)根據(jù)地形對(duì)園地進(jìn)行撩壕深翻,全園翻土,全園撒施有機(jī)肥,每666.7 m2施3000~4000 kg腐熟農(nóng)家肥,施肥后進(jìn)行土地平整,以達(dá)到地塊相對(duì)平坦、土壤疏松保水為宜。建園時(shí)應(yīng)規(guī)劃好園區(qū)道路、灌溉和排水系統(tǒng)。行株距3 m×1.8 m,平棚架式栽培。需配置授粉雄樹,雌雄比例為6~8∶1,授粉品種最好為軟棗獼猴桃雄株,中華獼猴桃或其他同屬種雄株存在親和性差的問題,且要求授粉品種與湘獼棗花期基本相遇、花粉量大、親和性強(qiáng)。
3.3 灌溉施肥
10月底落葉后,施基肥1次,建議重施基肥,每株施用腐熟農(nóng)家肥約50 kg或商用有機(jī)肥每株約30 kg,同時(shí)混合過磷酸鈣或鈣鎂磷肥每株約1 kg。采用兩樹之間挖條狀溝施肥或者撒施方式,后根據(jù)植株生長(zhǎng)狀態(tài)施用萌芽肥和壯果肥。湘獼棗喜濕潤(rùn)環(huán)境,大圍山野生湘獼棗母株生長(zhǎng)在小溪邊,靠近水源。坐果期需注意土壤墑情,及時(shí)灌水。采用樹體滴灌、簡(jiǎn)易管道灌溉、挖穴埋槽、控穴覆膜集雨、樹盤覆蓋等節(jié)水灌溉與保水技術(shù)。園區(qū)種植湘獼棗必須根據(jù)降雨量及土壤施肥量及時(shí)灌溉,以滿足該品種的生長(zhǎng)需求。
3.4 整形修剪
湘獼棗樹體生長(zhǎng)勢(shì)較為中庸,建議平地栽培采用平棚架,坡地栽培建議采用“T”形棚架。樹體可整形為樹高1.2~1.6 m,四面留2~4個(gè)主枝40~60 cm的“開心形”樹形,也可采用常見的棚架栽培,樹形為“一干兩蔓”,干高一般為1.4 m左右,且主干直立,兩蔓在架下20~30 cm左右呈“Y”形延伸,根據(jù)株行距與栽培密度,每主蔓配置8~12個(gè)側(cè)枝。冬季修剪主要對(duì)1年生枝條短截,留強(qiáng)枝去弱枝,保留足夠的結(jié)果母枝,同時(shí)疏除過密和細(xì)弱枝條。春夏季修剪摘心、除萌及綁縛,及時(shí)抹除主干的萌芽,特別是花后對(duì)結(jié)果枝及時(shí)摘心處理,前端花上留4~5枚葉片,防止因枝條營(yíng)養(yǎng)生長(zhǎng)過旺導(dǎo)致的花后落果現(xiàn)象。
3.5 越冬管理
湘獼棗在大圍山地區(qū)種植冬季不需做防寒處理,在大圍山海拔650 m種植園區(qū)可自然越冬。
3.6 病蟲害防治
湘獼棗抗性較強(qiáng),在瀏陽(yáng)大圍山地區(qū)栽培無嚴(yán)重病蟲害及凍害發(fā)生,其潰瘍病抗性稍強(qiáng)于米良1號(hào)。生長(zhǎng)季節(jié)4—9月,重點(diǎn)防治金龜甲類、葉蟬類、斜紋夜蛾等害蟲,還需關(guān)注并防治病害如獼猴桃花腐病、根腐病、黑斑病等。需及時(shí)清除園區(qū)地內(nèi)惡性雜草,如絲茅草、水花生、香附子等,保證園區(qū)果園通風(fēng)透光,加強(qiáng)水肥管理,保持良好的樹勢(shì)。根據(jù)樹勢(shì)調(diào)整掛果數(shù)量,避免因營(yíng)養(yǎng)生長(zhǎng)與生殖生長(zhǎng)不平衡引起病害發(fā)生。冬季修剪后注意及時(shí)清除園內(nèi)各類枯枝落葉和雜草,并集中燒毀。清園后全園噴施3~5°Bé石硫合劑,用波爾多漿刷白樹干或用3°Bé石硫合劑涂樹干。
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