中圖分類號:S661.1 文獻(xiàn)標(biāo)志碼:A 文章編號:1009-9980(2025)05-1077-10
Abstract: Apple (Malus × domestica Borkh.) is one of the major cultivated fruit crops in China,and its cultivation area and yield rank first globally.The selection of excellnt rootstock varieties is the basis and guarantee for high quality and high yield of apple.Rootstock affects not only its stress resistance and adaptability,but also the quality and yield of apple.In recent years,abiotic stressors, such as drought,soil salinity,heat and cold,are major limiting factors,which result in a decline in fruit quality and yield of apple,and seriously affect the healthy and sustainable development of the apple industry. These threats are likely to become even more significant under climate change and the pressures of an ever-growing human population. The stress resistance of apple trees mainly depends on the rootstock. Therefore,it is of great significance for the development of apple industry to identify and evaluate the resources of apple rootstock and screen the excellent rootstocks with strong stress resistance. China is one of the world's largest apple origin centers,abundant in germplasm resources,and holds great potential for resource innovation and utilization. It is of utmost significance for the development of the apple industry to select outstanding rootstocks with strong stress resistance and dwarfing traits. In this paper, the research and utilization situation of apple rootstock resources both at home and abroad was reviewed to provide a basis for the breeding and wide application of apple rootstocks. The main results are as follows: (1) Apple belongs to Rosaceae family, which comprises 36 species in the world,of which 25 are native to China,including more than 1OO variant types.Among these different species and types,there are abundant resources of apple rootstocks with utilization and potential utilization value, which have excellent germplasm such as drought resistance, cold resistance, flood resistance, salt tolerance, iron deficiency resistance and apomixis. Some of these rootstocks are directly used in production. For along time,M.sieversii,M.robusta,M. hupehensis and M. baccata have been used as rootstocks in most apple producing areas in China. (2) Apple often suffers from adverse stresses, such as drought, low temperature,salt and alkali, which affects its growth and development and reduces its yield and fruit quality. It has been found that the drought tolerance of M. sieversi,M. prunifolia and M. toringoides are strong. The salt tolerance of apple rootstock varies greatly among diferent species, ecotypes and even among different individuals, and the salt tolerance of M. xiaojinensis and M. prunifolia were strong. Cold damage often occurs in many apple producing areas in north China, which threatens the development of apple production, so the evaluation on cold resistance of apple rootstock, breeding of cold resistant rootstock and the study on cold resistance mechanism have attracted much attention. In terms of cold resistance evaluation, membrane permeability, relative water content and malondialdehyde are considered to be closely related to cold resistance.GM256 and CX3 are two apple rootstocks that have been reported to be cold-resistant in China. (3)Dwarf cultivation is the development trend of apple production in the world, and dwarf rootstock is one of the main ways to achieve dwarf density-planting. Some dwarfing rootstocks,including SH series,Liaozhen,GM256 and Qingzhen, were bred by hybridization with apple resources in many agricultural institutions in our country. At present, dwarfing rootstocks used in apple production in China mainly include M9T337,M26,MMl06,B9,SH, GM256 and so on. (4) In the past two decades,the cultivation mode of apple in the world has undergone fundamental changes, the tree shape is developing from standard planting to dwarf dense planting,and management is developing from time-consuming and labor-intensive to labor-saving.At present, in the United States,Italy,New Zealandand other countries,the dwarf cultivation has accounted for more than 70% of the total area of apple cultivation However, 80% of apple trees in China are still applying standard planting. Standard-planting apple trees have large crowns, poor light reception, inferior fruit quality, and the cultivation and management costs are high,in which the labor cost has accounted for more than 60% of the total cost of apple production. The stress resistance and tree shape of the apple depend mainly on the rootstock. Under the new situation, how to cultivate and create apple rootstock that is resistant to stress and suitable for labor-saving cultivation and management has become a key scientific problem to be solved urgently in apple cultivation and management in China.(5) Although some apple germplasm resources such as M. sieversii,M. prunifolia and so on have strong drought resistance, they are vigorous.M. hupehensis has the characteristics of apomixis, but its drought resistance is poor and it is vigorous. In addition, the scion varieties on the seedling rootstock have some problems such as delaying fruit maturity. At present, there is a lack of apple rootstock varieties with good comprehensive traits like strong resistance and dwarfing. How to scientifically develop, breed and utilize these excellent germplasm resources is an important topic in the present research.(6) With the rapid development of molecular biology and genomics of fruit crops, people are shifting the research focus of apple rootstock from physiological traits to genetic mechanism. The completion of whole genome sequencing of apple provides a good genomic data platform for further analysis of important agronomic traits of apple rootstocks.At the same time, it will lay a solid foundation for breeding new varieties of apple rootstock with excellnt characteristics such as strong resistance,dwarfing and apomixis.Therefore,accelerating the evaluation, identification,development and utilization of apple wild resources and strengthening the selection and breeding of new apple rootstocks will be of great significance to the healthy,stable and sustainable development of the apple industry in China and even on the world.
Key Words:Apple; Rootstock; Stress resistance; Dwarf; Identification and evaluation
蘋果(Malus × domesticaBorkh.)是我國主要栽培的果樹之一,栽培面積和產(chǎn)量均居世界首位]。蘋果產(chǎn)業(yè)在精準(zhǔn)扶貧、鄉(xiāng)村振興及生態(tài)保護(hù)中發(fā)揮重要作用。蘋果產(chǎn)業(yè)的快速發(fā)展離不開優(yōu)良新品種的選育、應(yīng)用和推廣。優(yōu)良的砧木是蘋果優(yōu)質(zhì)高效生產(chǎn)的基礎(chǔ)和保證,砧木不僅影響蘋果植株的適應(yīng)性和抗逆性,還影響品質(zhì)和產(chǎn)量[2-4]。隨著全球變暖,極端氣候頻繁出現(xiàn),經(jīng)常發(fā)生大面積、不同程度的干旱、低溫、鹽堿等非生物脅迫,造成蘋果果實品質(zhì)和產(chǎn)量下降,嚴(yán)重影響蘋果產(chǎn)業(yè)健康可持續(xù)發(fā)展[5。蘋果的抗逆性主要取決于砧木,因此,對蘋果砧木資源進(jìn)行鑒定與評價,篩選抗逆性強(qiáng)并矮化的優(yōu)良砧木,對蘋果產(chǎn)業(yè)的發(fā)展具有重要意義。筆者就國內(nèi)外蘋果砧木資源的研究和應(yīng)用現(xiàn)狀及抗逆性研究進(jìn)行了綜述,以期為蘋果砧木的選擇和利用提供依據(jù)。
1蘋果砧木資源在非生物脅迫抗性中的評價及利用
據(jù)李育農(nóng)報道,蘋果有36個種,其中原產(chǎn)于我國的有25個種,包含了100多個變異類型。在這些不同的種及其類型中,蘊藏著豐富的具有抗旱、抗寒、抗?jié)?、耐鹽、抗缺鐵及矮化、半矮化和無融合生殖等優(yōu)異的蘋果砧木資源,其中有些蘋果種質(zhì)資源可直接應(yīng)用于生產(chǎn)[6.8-10]。長期以來,多位研究者對蘋果砧木資源在抗旱、抗寒、耐鹽等非生物脅迫中的抗性進(jìn)行鑒定與評價,挖掘了一批特異種質(zhì)資源(表1)。
1.1 耐旱性
干旱是蘋果生產(chǎn)中經(jīng)常遇到的問題,嚴(yán)重制約蘋果產(chǎn)業(yè)的發(fā)展[19-20]。我國是蘋果屬植物的重要起源地之一,擁有大量的抗旱種質(zhì)資源,耐旱性較強(qiáng)的種質(zhì)有新疆野蘋果、楸子和東北黃海棠等[9,21-22]。研究發(fā)現(xiàn)不同種或類型的蘋果砧木的抗性差異較大(表1)。葉乃好等對10種蘋果砧木資源進(jìn)行了抗旱性鑒定與評價,發(fā)現(xiàn)Luo-6、Luo-2是耐旱性強(qiáng)的砧木,八棱海棠,萊蕪茶果、黃海棠是中等耐旱砧木,山定子、平邑甜茶、六蜜海棠為不耐旱砧木。Ma等[23]用隸屬函數(shù)值法對10種蘋果砧木的抗旱性進(jìn)行了綜合評價,發(fā)現(xiàn)楸子和新疆野蘋果耐旱性較強(qiáng),而平邑甜茶和變?nèi)~海棠耐旱性較差。傅明洋[2發(fā)現(xiàn)楸子不同類型之間的耐旱性也有顯著差異,耐旱性強(qiáng)的蘋果砧木有富平楸子、東北黃海棠;中等抗旱的砧木為吳起楸子、五棱海棠以及嶗山柰子;抗旱性相對較弱的是紅海棠和白海棠。魏江彤等對8份蘋果種質(zhì)資源的抗旱性進(jìn)行評價,發(fā)現(xiàn)LC36和L7(M.soulardii)的耐旱性強(qiáng)于新疆野蘋果和楸子。
Wang等[24]比較分析了兩種蘋果砧木的耐旱性差異機(jī)制,發(fā)現(xiàn)干旱脅迫下耐旱性強(qiáng)的蘋果砧木楸子受到的氧化脅迫傷害較小,且其抗氧化防御能力強(qiáng)于耐旱性較差的平邑甜茶。Tworkoski等[25]對兩種無性系蘋果砧木MM111和M9進(jìn)行了耐旱性比較分析,結(jié)果發(fā)現(xiàn),M9通過提高ABA含量,增強(qiáng)其耐旱性,而MM111則是通過較多的延長根來提高耐旱性。Liu等[2以抗旱性差異顯著的兩種蘋果砧木楸子和平邑甜茶為材料,研究了中度干旱下兩種砧木6個水通道蛋白基因表達(dá)的變化,發(fā)現(xiàn)干旱脅迫下6個水通道蛋白基因都上調(diào)表達(dá),但蘋果砧木間的表達(dá)有顯著差異,推測這可能是造成兩種蘋果砧木抗旱性不同的主要原因。
1.2 耐鹽性
土壤鹽堿化是干旱、半干旱及沿海灘涂地區(qū)蘋果生產(chǎn)栽培的主要障礙[2。蘋果砧木的耐鹽性在不同蘋果種間、不同生態(tài)類型間及不同個體間都有較大差異。杜中軍等通過盆栽對19種蘋果砧木進(jìn)行了耐鹽性評價,發(fā)現(xiàn)Luo-1、Luo-2和珠美海棠為高耐鹽的蘋果砧木,變?nèi)~海棠、山定子、麗江山定子、德欽海棠和花紅為不耐鹽蘋果砧木。Yin等通過水培對15種蘋果砧木的耐鹽性進(jìn)行了綜合評價,發(fā)現(xiàn)楸子、東北黃海棠、大果紅三葉海棠和小金海棠屬耐鹽性蘋果砧木,而盧氏紅果、櫻葉海棠和西府海棠則屬不耐鹽蘋果砧木。林冰冰等[15對16個種80份蘋果砧木資源1年實生苗進(jìn)行了耐鹽性評價分析,發(fā)現(xiàn)實施高鹽脅迫10d后,鹽害指數(shù)變異為 0.00~ 0.90,變異系數(shù)為 0%~173% ;耐鹽性強(qiáng)的種質(zhì)資源有7份,耐鹽性較強(qiáng)的57份,耐鹽性弱的共16份。
Molassiotis等2以蘋果砧木MM106為試材,比較研究了NaCI和KCI處理下的生理生化指標(biāo),發(fā)現(xiàn)兩種氯鹽顯著抑制植株生長,降低了葉綠素含量、光合效率和礦質(zhì)元素利用效率。王慧英等2發(fā)現(xiàn)小金海棠和M7耐鹽性有顯著差異,耐鹽性較強(qiáng)的小金海棠葉中的 Na+,[Na+]/[K+] 均小于耐鹽性差的M7,而根中則相反,且耐鹽性較強(qiáng)的蘋果砧木小金海棠根中 Na+ 增加幅度較大。說明蘋果砧木可能的耐鹽機(jī)制是根系能截留較多的 Na+ ,并以某種形式阻正部分 Na+ 向地上部的運輸,從而減輕了鹽離子對地上部的毒害作用。Li等2研究發(fā)現(xiàn),鹽脅迫下平邑甜茶葉片中離子轉(zhuǎn)運蛋白和水通道蛋白相關(guān)基因
MdHKT1、MdSOS1和MdNHX1的表達(dá)量顯著高于櫻葉海棠,說明平邑甜茶具有更強(qiáng)的使 Na+ 外排和將Na區(qū)隔到液泡中的能力,從而提高了耐鹽性。薛浩等[3研究了寒富二倍體和同源四倍體蘋果的耐鹽差異機(jī)制,發(fā)現(xiàn)鹽脅迫下二倍體和同源四倍體蘋果中水通道相關(guān)蛋白基因MdPIPI;1,MdPIP2;1,MdTIP1;1和MdTIP2;1的表達(dá)量都呈先下降后上升高趨勢,但四倍體的表達(dá)量顯著高于二倍體,推測四倍體蘋果的耐鹽性強(qiáng)可能與水通道蛋白基因的表達(dá)水平較高有關(guān)。
1.3 抗寒性
我國北方的一些蘋果產(chǎn)區(qū),經(jīng)常發(fā)生低溫凍害,造成枝條干枯,嚴(yán)重時甚至整株死亡,影響蘋果品質(zhì)和產(chǎn)業(yè)的健康發(fā)展。20世紀(jì)60年代中國發(fā)現(xiàn)起源于大興安嶺的山定子抗寒性極強(qiáng),用其做親本選育了多個抗寒砧木,其中GM256和CX3是目前報道的我國選育出最抗寒的兩個砧木[31]。任慶棉[8采用電解質(zhì)滲出率法對蘋果屬植物11個種18個類型進(jìn)行了耐寒性評價,發(fā)現(xiàn)東北山定子和東北黃海棠抗寒性強(qiáng),分析認(rèn)為抗寒能力強(qiáng)與東北山定子和東北黃海棠原產(chǎn)地的氣候有關(guān),長期受嚴(yán)寒氣候環(huán)境的影響,逐漸適應(yīng)了低溫環(huán)境,因此表現(xiàn)出較強(qiáng)的抗寒性。Mirabdolbaghi等[32]發(fā)現(xiàn)5種蘋果砧木B9、M9、MM106、M26和Azayesh的耐寒性存在明顯差異,B9耐寒性強(qiáng)。殷麗麗等[3采用低溫處理對4種蘋果砧木71-3-150、GM256、SH6和M9的抗寒性進(jìn)行比較分析,發(fā)現(xiàn)從俄羅斯引進(jìn)的矮化砧木71-3-150抗寒性最強(qiáng),其次為GM256和SH6,M9的抗寒性最差。同時發(fā)現(xiàn)低溫脅迫下71-3-150能維持較高的可溶性蛋白水平及較高的SOD和POD活性,這可能與其抗寒能力有關(guān)。Mirabdolbaghi等[2將5種蘋果砧木分別種在不同質(zhì)地的土壤中,結(jié)果發(fā)現(xiàn),蘋果砧木Azayesh生長在含淤泥 48% 、砂 20% 、黏土 31% 和石灰 14% 的土壤中抗寒性最好,而M9生長在含淤泥49.2% 、砂泥 19.8% 、黏土 31% 和石灰 18% 的土壤中抗寒性最好,表明土壤質(zhì)地也影響蘋果砧木的抗寒性。Artlip等34將從桃樹中分離的 CBF genes轉(zhuǎn)入蘋果砧木M9后增強(qiáng)了蘋果砧木的耐寒性。井俊麗等[5對9份蘋果種質(zhì)資源的抗寒性進(jìn)行了評價,發(fā)現(xiàn)新選育的砧木(編號100和147)耐寒性強(qiáng)。
鑒定和挖掘抗寒性強(qiáng)的種質(zhì)資源是蘋果抗寒性砧木育種的前期基礎(chǔ),而探尋適宜快速評價抗寒性的方法是研究的主要內(nèi)容之一。在評價抗寒性指標(biāo)方面,電導(dǎo)率、MDA含量、相對含水量、抗氧化酶活性和脯氨酸含量等指標(biāo),被認(rèn)為與植物的抗寒性密切相關(guān)[8,28,33]。金明麗等[3研究發(fā)現(xiàn),枝條的電阻抗參數(shù)與蘋果砧木的抗寒性呈負(fù)相關(guān),蘋果砧木枝條電阻率及胞外電阻率可以作為評價蘋果砧木抗寒性的參數(shù)。以上研究結(jié)果對在栽培生產(chǎn)中快速評價蘋果抗寒性,并及早采取相應(yīng)的防寒措施具有重要的指導(dǎo)意義。
1.4 耐澇性
水分是影響植物生長和發(fā)育的重要因素,然而,土壤水分過多并不利于植株正常生長,甚至?xí)饾澈Πl(fā)生,澇害已成為威脅蘋果生長發(fā)育、影響產(chǎn)量及品質(zhì)提升的主要非生物脅迫之一[37-39]。水分過多對植物造成的傷害主要是根部缺氧所致[40-42]。植物在低氧條件下,有氧呼吸受到抑制,活性氧等有害物質(zhì)積累,內(nèi)源激素代謝紊亂,產(chǎn)生乙醇、乳酸,造成細(xì)胞質(zhì)酸化,最終導(dǎo)致生長受抑,嚴(yán)重情況下導(dǎo)致植物死亡[37,43-45]。在實際生產(chǎn)栽培中,夏季和秋季的大量集中降雨和果園排水不良等因素,導(dǎo)致部分蘋果園經(jīng)常積水,蘋果樹葉片黃化、脫落,樹體衰弱,果實品質(zhì)和產(chǎn)量下降,進(jìn)而造成嚴(yán)重的經(jīng)濟(jì)損失。白團(tuán)輝等[采用低氧和盆栽淹水的方法評價了12種蘋果砧木的耐澇性,發(fā)現(xiàn)平邑甜茶耐澇,而新疆野蘋果和變?nèi)~海棠不耐澇。生利霞等[研究表明,平邑甜茶在低氧條件下植株生長受到抑制,根系呼吸速率也受到抑制,并且發(fā)現(xiàn)溶氧濃度越低,抑制越明顯。Bai等[43]研究表明,耐低氧的平邑甜茶根系形態(tài)保持較好且在根的基部長出許多新根,而新疆野蘋果沒有出現(xiàn)此現(xiàn)象。這表明低氧耐性較強(qiáng)的平邑甜茶能夠通過維持較高的光合性能來適應(yīng)低氧逆境,這也許正是平邑甜茶比較耐低氧的原因。
1.5 耐缺素
蘋果砧木負(fù)責(zé)從土壤中吸收水分和礦質(zhì)元素,并將其運輸至地上部。因此,砧木直接影響蘋果樹體的營養(yǎng)水平和正常的生長發(fā)育,林冰冰等對蘋果砧木資源的耐缺鐵性進(jìn)行了評價,發(fā)現(xiàn)不同種和生態(tài)型耐缺鐵性表現(xiàn)出極顯著的差異。小金海棠具有較強(qiáng)的穩(wěn)定的耐缺鐵能力,八棱海棠和平邑甜茶抗缺鐵能力中等,而山定子抗缺鐵能力差。李振俠等研究發(fā)現(xiàn)缺鐵脅迫下兩種蘋果砧木SH40和八棱海棠的根系分泌有機(jī)酸種類相同,但總量有顯著差異。Zhu等開發(fā)了與小金海棠耐缺鐵相關(guān)的分子標(biāo)記,對雜交后代進(jìn)行鑒定,準(zhǔn)確率達(dá)到 85% 以上。劉飛等[48]比較了4種蘋果砧木的耐缺鋅能力,發(fā)現(xiàn)小金海棠耐低鋅,而山定子對低鋅脅迫敏感。王金花等4比較研究了兩種蘋果砧木小金海棠和平邑甜茶對缺鋅脅迫響應(yīng)的差異機(jī)制,發(fā)現(xiàn)缺鋅脅迫下小金海棠的抗氧化能力強(qiáng),對缺鋅有較強(qiáng)的抵御和耐受能力。
2蘋果矮化砧木資源國內(nèi)外研究進(jìn)展及利用
2.1我國蘋果矮化砧木研究進(jìn)展及利用
矮砧栽培是我國蘋果發(fā)展的必然趨勢,與喬化栽培相比,具有樹體矮化、成花早、便于管理等優(yōu)點[50-52]。我國在蘋果矮化資源的挖掘及砧木的選育方面起步較晚,目前選育的矮化蘋果砧木品種還比較少。SH系是以矮化蘋果資源河南武鄉(xiāng)海棠和國光為親本,選育的矮化蘋果砧木,如SH6、SH38、SH40。經(jīng)過多年的推廣和應(yīng)用表明,SH系具有矮化、抗旱、栽植后易成花、結(jié)果早等優(yōu)點,但其抗寒性差,在我國北方地區(qū)推廣受到限制[5]。其他研究單位用引進(jìn)的蘋果矮化砧木M系與我國蘋果矮化資源進(jìn)行雜交,選育出多個矮化蘋果砧木品種,包括遼砧系列、GM256、青砧系列、77-34、63-2-19等[53],在我國部分蘋果產(chǎn)區(qū)推廣應(yīng)用。目前我國蘋果生產(chǎn)中應(yīng)用的矮化砧木主要有M9T337、M26、B9、SH系、GM256等。
秦立者等[54對喬化蘋果砧木八楞海棠、半矮化砧木SH3和SH37、矮化砧木SH38、M26和B9及極矮化砧木P22的葉片進(jìn)行了細(xì)胞結(jié)構(gòu)研究,發(fā)現(xiàn)蘋果砧木的矮化程度越高,葉片柵欄組織越厚。研究表明,植物葉片柵欄組織的厚度、緊密度和疏松度等指標(biāo)與植物抗寒性密切相關(guān)[5]。羅靜等[發(fā)現(xiàn)以M9和M26矮化中間砧嫁接的長富2號,其凈光合速率顯著高于以八棱海棠為基砧的蘋果樹,而氣孔導(dǎo)度和蒸騰速率較低,表明矮化中間砧的蘋果樹光合調(diào)節(jié)能力強(qiáng),具有較高的凈光合速率。姜志昂等[57]對蘋果矮化砧木M26、SH28和SH40及嫁接品種嘎拉進(jìn)行了分析,發(fā)現(xiàn)ABA合成基因MdNCED1的表達(dá)量與3種砧木嫁接樹的矮化程度呈正相關(guān)。Zhou等[通過對B9、G24、M26、SH1、SH6和SH40共6種矮化砧木在高溫脅迫下探究生理和基因水平上的變化,發(fā)現(xiàn)SH系列砧木耐熱性最強(qiáng),M26的適應(yīng)能力最低,G24的恢復(fù)能力較高。
2.2 國外蘋果矮化砧木研究進(jìn)展及利用
自19世紀(jì)英國首次報告蘋果矮化砧木以來,各個國家都很重視蘋果矮化砧木的選育工作,也選育出了一些優(yōu)良的矮化蘋果砧木。如英國的M系和MM系[52,59-60],美國的G系和CG系[25,61-62],蘇聯(lián)的B系[63],日本的JM系[64],加拿大的O系[65-6和波的P系[67-68]。美國從1968年開始對蘋果種質(zhì)資源進(jìn)行了廣泛評價和篩選,并將蘋果砧木育種目標(biāo)定為矮化、抗火疫病、抗蘋果綿蚜、抗重茬、早產(chǎn)豐產(chǎn)等。經(jīng)過連續(xù)多年常規(guī)雜交,多層次的評價與篩選,最終成功選育出了14個廣泛推廣應(yīng)用的蘋果砧木品種,包括1個極矮化砧木(G65)、5個矮化砧木(G16、G41、G214、G814、G213)、8個半矮化砧木(G30、G11、G202、G935、G969、G210、G890、G222)[69]。
目前,M9系列中以M9-T337應(yīng)用最為廣泛,M9-T337是荷蘭從M系中選育出的蘋果矮化砧木,用其嫁接的蘋果樹樹體生長矮小,易成花,結(jié)果早,且豐產(chǎn)性好[7]。由于M系砧木抗寒性稍差,蘇聯(lián)選擇用抗寒資源與M系砧木進(jìn)行雜交,選育了抗寒性極強(qiáng)的B系列矮化砧木,其中B9砧木矮化、抗寒性強(qiáng),且其嫁接的蘋果樹結(jié)果早、豐產(chǎn)、固地性強(qiáng)、能抗 -12°C 的低溫,是推廣應(yīng)用較廣的抗寒矮化砧木之一[7]。美國康奈爾大學(xué)利用M27、M26、Robusta5和Ottawa3做親本培育了G系砧木,其中G16,G41和G935矮化且抗蘋果再植病[72-73]。
3展望
3.1加強(qiáng)野生蘋果種質(zhì)資源評價與優(yōu)異基因的挖掘與利用
我國擁有豐富的蘋果種質(zhì)資源,已鑒定出了抗旱種質(zhì)資源新疆野蘋果、楸子,抗寒資源山定子,耐缺鐵的小金海棠,矮化資源河南海棠、嶗山柰子,無融合生殖資源平邑甜茶、變?nèi)~海棠等。但目前僅對部分蘋果種質(zhì)資源進(jìn)行了鑒定與評價,一些資源還有待鑒定與評價。蘋果遺傳背景復(fù)雜,雜合度高、童期長、個體差異大,精準(zhǔn)鑒定與評價比較困難。此外,鑒定與評價方法和技術(shù)以傳統(tǒng)的形態(tài)學(xué)觀察和生理生化分析為主,重要農(nóng)藝性狀的遺傳規(guī)律及優(yōu)異基因的定位與挖掘等研究與其他農(nóng)作物相比仍有較大差距。因此,應(yīng)提升蘋果種質(zhì)資源的鑒定與評價水平,加快優(yōu)異基因的挖掘與利用,為優(yōu)良蘋果砧木的創(chuàng)制提供優(yōu)異的基因資源。
3.2創(chuàng)制抗逆和省力化栽培的蘋果砧木是將來的育種目標(biāo)
長期以來,我國蘋果產(chǎn)區(qū)主要以新疆野蘋果、八棱海棠、山定子、平邑甜茶和楸子等作為砧木。雖然新疆野蘋果、楸子等抗旱性強(qiáng),但喬化。平邑甜茶具有無融合生殖特性,但抗旱性差且喬化,且以種子播種的實生苗為砧木,接穗品種存在結(jié)果晚等問題。當(dāng)前缺少抗性強(qiáng)、矮化等綜合性狀優(yōu)良的蘋果砧木品種。在過去的30年中,全球蘋果的栽培模式發(fā)生了較大變化,由稀植大冠形向矮砧小冠形發(fā)展,栽培管理由費時費工向省力化發(fā)展。目前,美國、意大利和新西蘭等國家蘋果矮砧密植栽培占其栽培總面積的 70% 以上[74,而我國仍有 80% 的蘋果為喬砧稀植栽培,此栽培模式的蘋果,樹冠大、易密閉、光照不良、品質(zhì)差,且栽培管理成本高,其中勞動力成本已占蘋果生產(chǎn)總成本的 60% 以上。因此,在新形勢下,如何培育和創(chuàng)制抗逆和省力化栽培管理的蘋果砧木,是將來蘋果砧木育種的目標(biāo)。
3.3利用現(xiàn)代生物技術(shù)助力對蘋果砧木新品種的選育
蘋果砧木培育需要經(jīng)過長期、系統(tǒng)的鑒定與評價方可推廣應(yīng)用。因此,蘋果砧未育種及評價工作比接穗品種的難度更大,周期更長。隨著分子生物學(xué)和基因組學(xué)的快速發(fā)展,已經(jīng)對部分蘋果品種進(jìn)行了全基因組測序,構(gòu)建了完善的蘋果數(shù)據(jù)庫,為優(yōu)異資源和基因的挖掘、重要基因的克隆和重要性狀分子標(biāo)記的開發(fā)提供了堅實的基礎(chǔ)。同時,利用基因工程技術(shù)和分子輔助育種手段,將特定基因轉(zhuǎn)入蘋果砧木的細(xì)胞或組織中,有目的地改變性狀,培育出抗逆、矮化和無融合生殖的優(yōu)良砧木已成為可能。
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