中圖分類號:S662.1 文獻標志碼:A 文章編號:1009-9980(2025)05-0993-1
Abstract: 【Objective】 The cultivation practices for Jinhuangjin peach in Yiyuan County are characterized by family-based operations,with most planting areas being less than 5acres.The level of mechanization is relatively low,and the average age offruit farmers exceeds 55 years old.Foliar fertilizer technology is readily adopted in local orchard management,demonstrating high acceptance among fruit farmers.The experiment was carried out to investigate the effects of two foliar fertilizesr on fruit quality and volatile flavor compounds in Jinhuangjin peach in Yiyuan region,so as to provide theoretical ref
City, Shandong Province.【Methods】In 2023 and 2024,11-year-old and 4-year-old Jinhuangjin peach trees,a local specialty variety, served as test materials. Three treatments were implemented: amino acid selenium fertilizer (AA-Se), water-soluble silicon fertilizer (WSF-Si),and clear water (control).The aim was to evaluate the impact of these two foliar fertilizers on the fruit quality and volatile flavor compounds of Jinhuangjin peachs.【Results】The results indicated that,compared to the control,foliar application of both types of foliar fertilizers effectively improved the leaf quality,yield per tree,fruit mass and the content and variety of volatile flavor compounds in Jinhuangjin peaches,but had no significant effect on the soluble solids content,the titration acid content or fruit firmness.The AA-Se increased the chlorophyll-a content, carotenoid content,and leaf mass per area from 6.43% to 8.96% , 12.07% to 18.29% ,and 4.83% to 27.27% , respectively, compared to the control. The yield per tree increased from 18.95% to 18.96% . The fruit mass per unit increased from 7.39% to 15.54% . The WSF-Si significantly enhanced leaf thickness and mass per area, with leaf thickness increasing from 5.24% to 6.43% and leaf mass per area increasing from 14.92% to 22.73% , compared to the control. The yield per tree increased from 13.00% to 20.18% .The fruit mass increased from 4.76% to 19.51% .A total of16 volatile flavor compounds were detected inJinhuangjin peaches,including 6 aldehydes,6 esters,2 terpenes,1 alcohol and 2-Octanone.It was found that there were certain differences in the types of volatile compounds in Jinhuangjin peach fruits between years, but aldehydes were consistently the predominant volatile compounds, with their contents higher than other types,accounting for 47.04% to 83.02% of the total volatile compounds inall samples,with 2-Hexenal, (E)-being the main aldehyde. In the 2023 experiment, theAA-Se and WSF-Si treatments increased the aldehyde contentsby 130.35% and 32.38% ,respectively,compared to thecontrol,with no significant diference in ester content.Additionally, with the AA-Se treatment,3 additional volatile compounds were detected (Furfural, 2-Furancarboxaldehyde,5-methyland γ. -Hexalactone) compared to the control;with the WSF-Si foliar fertilizer treatment,3 additional volatile compounds were detected (Furfural, γ. -Hexalactone, and γ -Decalactone) compared to the control. In the 2024 experiment, the AA-Se and WSF-Si treatments increased the aldehyde contents by 25.05% and 40.61% ,respectively, compared to the control; the ester content increased by 124.76% and 49.92% , respectively; and the terpene content increased significantly by 16.31% and 11.06% ,respectively. Additionally, with the AA-Se treatment, ethyl acetate was detected compared to the control; with the WSF-Si foliar fertilizer treatment, 4additional volatile compounds were detected (E,E)-2,4-Hexadienal, Ethyl acetate and γ -Hexalactone) compared to the control. In the 2023 experiment, only the AA-Se increased the odor activity value (OAV)of fruity and vegetal aromas compared to the control. In the 2024 experiment, both foliar fertilizer treatments significantly increased the OAV of various types of aromas in the fruit,with the AA-Se increasing the OAV of fruity, vegetal,fatty,and sweet aromas by 56.52% , 29.06% , 38.86% ,and 91.20% ,respectively,compared to the control; and the WSF-Si increased the OAV of fruity, vegetal, fatty, and sweet aromas by 30.70% , 53.72% , 76.41% ,and 35.78% , respectively. The comprehensive evaluation using principal component analysis combined with membership function analysis showed that the rankings for comprehensive evaluation in 2O23 and 2024 were: amino acid selenium foliar fertilizer (AA-Se),water-soluble silicon fertilizer (WSF-Si),and control. 【Conclusion】 Application of AA-Se and WSF-Si significantly enhanced the leaf quality in Jinhuangjin peach; increased the yield per tree,fruit mass and the contents of ester and aldehyde volatile substances in the fruit, and imparted a stronger fruity and vegetal-like aroma, thereby improving the overall fruit quality,with AA-Se showing the best effect.Among the treatments,the most effective method was to spray 6O0-fold AA-Se once every15 days starting from the end of flowering,for a total of seven applications.Due to the excelent storage and transportation properties of Jinhuangjin peach, which can be stored incold storage for up to one month,it is essential to fully consider the impact on postharvest ripening when evaluating its volatile flavor compounds.Silicon can enhance plants’resistance to a range of abiotic and biotic stresses and plays a crucial role in their growth under adverse conditions, so that it is hypothesized that water-soluble silicon fertilizers may have even greater application value in orchards prone to drought and high temperatures. The specific impacts await further investigation.
Key Words: Jinhuangjin peach; Foliar fertilizer; Leaf development quality; Fruit quality; Volatile compounds
金黃金桃是沂源縣特色農(nóng)產(chǎn)品,獲得“沂源金黃金桃”國家地理標志商標。沂源縣地處魯中山區(qū)腹地,以山區(qū)地形為主,受地形限制,絕大部分果園為喬砧密植,機械化程度和集約化程度較低,栽培管理技術落后,以傳統(tǒng)家庭小果園為主,存在著果園樹齡大、園區(qū)密閉、土壤鹽漬化、生產(chǎn)的果品質(zhì)量連年下降、種植效益下降等問題。同時,當?shù)剡€易受到干旱、連陰天、倒春寒、冰雹等極端天氣的影響。
葉面肥直接用于作物葉片表面,通過葉片吸收發(fā)揮作用。因具有施肥量小、肥效迅速、肥料利用率高、施用簡便、用工量小、受土壤環(huán)境影響小等特點,在機械化程度低、集約化程度低、勞動力老齡化的果園,以及土壤環(huán)境不適宜、根系吸收能力差的一些逆境環(huán)境(低溫、澇害)需要迅速補充營養(yǎng)的情況下具有重要的應用價值。葉面肥產(chǎn)品大致可以分為5類[:(1)無機營養(yǎng)型:選取一些水溶性好的化肥原料單一或復配而成葉面肥產(chǎn)品。包括一些大中微量的營養(yǎng)元素、鑭系稀土元素和部分螯合銅、鐵、鋅等。(2)有機加營養(yǎng)元素型:采用腐殖酸、氨基酸、多糖等有機物質(zhì),吸附或利用其存在的氨基、羧基、羥基、醛基、酮基和甲氧基等官能團絡合中微量營養(yǎng)元素制成。(3)植物生長調(diào)節(jié)劑加營養(yǎng)元素型:天然或人工合成的植物生長調(diào)節(jié)劑添加中微量元素。(4)微生物加營養(yǎng)元素型:采用具有促生、抗病等功能的微生物菌劑添加營養(yǎng)元素制成。(5)其他類型:納米增效肥料等。隨著葉面肥產(chǎn)品在果樹生產(chǎn)中的廣泛應用和不斷發(fā)展,從最初作為果樹鈣、硼、鋅、鐵等中微量元素的快速補充手段,逐步發(fā)展至具有調(diào)節(jié)植物生長、提高果樹抗逆性、提高果品鮮食及加工品質(zhì)[5-、提高果品貯藏及保鮮能力[7-8]、生產(chǎn)功能性果品等多種作用。
氨基酸螯合肥在果樹利用微量元素的同時可被果樹直接吸收,肥料利用率高。硅肥在緩解植物滲透脅迫、重金屬離子脅迫、營養(yǎng)脅迫、極端溫度脅迫、紫外線脅迫等非生物脅迫和生物脅迫方面起到重要作用,對逆境條件下果樹的生長發(fā)育有著重要的應用潛力和前景。筆者在本研究中立足沂源縣桃樹產(chǎn)區(qū)的立地條件和產(chǎn)業(yè)發(fā)展情況,選用中國農(nóng)業(yè)科學院果樹研究所研發(fā)的氨基酸硒葉面肥、淄博樂悠悠農(nóng)業(yè)科技有限公司研發(fā)的水溶硅肥兩種葉面肥產(chǎn)品,觀察其對金黃金桃果實品質(zhì)和其揮發(fā)性風味物質(zhì)的影響,以期助力沂源縣桃樹產(chǎn)業(yè)提質(zhì)增效。
1 材料和方法
1.1材料
試驗在2023年于山東省淄博市沂源縣東里鎮(zhèn)馬家溝村果園(Majiagouorchard),在2024年于山東省淄博市沂源縣東里鎮(zhèn)福祿坪村果園(Fulupingor-chard)開展。氣候類型均為溫帶季風區(qū)域大陸性氣候,年降水量 600~700mm ,降雨分布不均勻,主要集中在夏季。春季易受干旱、倒春寒、冰雹等極端天氣影響。
供試果樹:分別以11年生金黃金桃(樹形均采用開心形,行株距 4.5m×4m×Ω 和4年生金黃金桃(高干Y形,行株距 4m×1m) 為試材。
氨基酸硒葉面肥為中國農(nóng)業(yè)科學院果樹研究所研發(fā),安丘鑫海生物肥料有限公司生產(chǎn):硒含量 (w) 3% ;水溶性硅肥為淄博樂悠悠農(nóng)業(yè)科技有限公司提供:Si含量 (ρ)≥100g?L-1,K2O 含量 。
1.2 試驗方法
試驗采用隨機區(qū)組設計,共設3個處理,每個處理選取長勢均勻一致的30株桃樹,各3次重復。分別為處理1(氨基酸硒肥):葉面噴施氨基酸硒葉面肥(600倍噴施);處理2(水溶性硅肥):葉面噴施水溶性硅肥(300倍噴施);對照(噴清水)。各處理自末花期開始每15d噴1次,共7次。
1.3樣品采集
果實成熟期(馬家溝村試驗園2023年8月29日,福祿坪村果園2024年8月28日)進行葉片和果實采樣,每個處理隨機采集20個果,30片葉(位于枝條中部功能葉片)。
1.4指標測定及方法
1.4.1葉片指標測定葉片厚度采用游標卡尺測定,葉片比葉重采用稱量法測定,葉綠素含量參考《植物生理學實驗指導》測定。
1.4.2果實品質(zhì)指標測定用BL-500S型電子天平稱量單果質(zhì)量;用果實硬度計GY-3(托普云農(nóng),中國)測定果肉硬度;用折光儀PAL-1(ATAGO,日本)測定可溶性固形物含量;采用氫氧化鈉滴定法測定可滴定酸含量;采用鉬藍比色法測定果實維生素C含量。3次重復,計算平均值。
香氣測定采用固相微萃取結(jié)合氣相質(zhì)譜聯(lián)用儀,具體方法參照Ji等[]的報道。Agilent7890A-5975C氣相色譜-質(zhì)譜聯(lián)用儀測定香氣組分,采用2-辛醇內(nèi)標法對香氣成分進行定量分析。
1.5 數(shù)據(jù)分析
采用Excel2021、SPSS等軟件對試驗數(shù)據(jù)進行整理和統(tǒng)計分析。
2 結(jié)果與分析
2.1葉面肥處理對金黃金桃葉片發(fā)育質(zhì)量的影響
比較兩種葉面肥處理下金黃金桃葉片發(fā)育質(zhì)量(表1),綜合來看,氨基酸硒肥葉面肥處理有效提高葉片葉綠素a含量、類胡蘿卜素含量和比葉重,較對照提高 6.43%-8.96%?13.72%-18.29% 和 4.83%~27.27% 。水溶性硅肥處理較對照顯著提高了葉片厚度和比葉重,葉片厚度較對照提高 5.24%~6.43% ,比葉重較對照提高 14.92%~22.73% 。
2.2葉面肥處理對金黃金桃果實品質(zhì)的影響
噴施氨基酸硒肥、水溶性硅肥兩種葉面肥均能夠提高單株產(chǎn)量和單果質(zhì)量(表2),單株產(chǎn)量較對照顯著提高 13.00%~20.18% ;單果質(zhì)量提高 4.76%~ 19.51% 。但對果實可溶性固形物含量、可滴定酸含量和果肉硬度影響較小。
2.3葉面肥處理對金黃金桃果實揮發(fā)性物質(zhì)的影響
2.3.1葉面肥處理對金黃金桃果實揮發(fā)性物質(zhì)組成成分及含量的影響通過對不同葉面肥處理金黃金桃果實的揮發(fā)性成分進行測定(表3),累計檢測出16種成分,包括6種醛類、6種酯類、2種萜烯類、1種醇類物質(zhì)和2-辛酮。試驗發(fā)現(xiàn)各年際處理間金黃金桃果實的揮發(fā)性成分種類存在一定差異,但均體現(xiàn)為醛類物質(zhì)是金黃金桃果實的主要揮發(fā)性成分,其含量明顯高于其他類型,在所有樣品的揮發(fā)性成分含量中占比達到 47.04%~83.02% ,其中青葉醛為主要的醛類物質(zhì)。
2023年馬家溝果園試驗中氨基酸硒肥、水溶性硅肥葉面肥處理的果實,醛類物質(zhì)含量較對照提高130.35%,32.38% ,酯類物質(zhì)含量與對照無顯著差異。此外,氨基酸硒肥葉面肥處理的果實較對照多檢測出糖醛、5-羥甲基糠醛和 γ. 己內(nèi)酯3種揮發(fā)性物質(zhì);水溶性硅肥葉面肥處理的果實較對照多檢測出糖醛 ?γ? -己內(nèi)酯和 γ? 癸內(nèi)酯3種揮發(fā)性物質(zhì)。
2024年福祿坪村果園試驗中氨基酸硒肥、水溶性硅肥葉面肥處理的果實醛類物質(zhì)含量較對照提高25.05% 、 40.61% ;酯類物質(zhì)含量較對照提高124.76% 、 49.92% ;萜烯類物質(zhì)含量較對照提高16.31%?11.06% 。此外氨基酸硒肥葉面肥處理的果實較對照多檢測出乙酸乙酯,水溶性硅肥葉面肥處理的果實較對照多檢測出 (E,E) -2,4-己二烯醛、乙酸乙酯和 γ. 己內(nèi)酯3種揮發(fā)性物質(zhì)。
2.3.2不同處理金黃金桃果實的活性呈香成分氣味活性值及香氣輪廓果實風味取決于香氣種類、濃度和氣味活性值(OAV), OAV?1 的成分才被認為具有芳香活性(表4)。在2023年試驗中,各處理的金黃金桃果實篩選出 OAV?1 的香氣活性成分為:芳樟醇、己醛、青葉醛、乙酸葉醇酯、乙酸己酯、-癸內(nèi)酯(水溶性硅肥)和2-辛酮。其中水溶性硅肥處理的果實較對照多檢測出y-癸內(nèi)酯,這是一種具有桃、杏、椰子、果香,甜香的物質(zhì)。
在2024年試驗中,各處理的金黃金桃果實篩選出 OAV?1 的香氣活性成分為:芳樟醇、己醛、青葉醛、乙酸葉醇酯、乙酸乙酯(氨基酸硒肥、水溶性硅肥)、乙酸己酯和2-辛酮。其中氨基酸硒肥和水溶性硅肥處理的果實均對照多檢測出乙酸乙酯,這是一種具有菠蘿、香料和溶劑味的物質(zhì)。
香氣輪廓圖(圖1)能夠簡單、直觀反映出果實的呈香類型。金黃金桃果實的呈香類型主要為水果類、植物類、脂肪類和花卉類。其中水果類、植物類氣味最為突出,水果類的氣味活性值在兩地試驗分別達到27.86\~33.94和45.12\~70.62;植物類的氣味活性值達到18.25\~29.87和36.78\~56.54。
氨基酸硒肥和水溶性硅肥處理沒有明顯改變果實的呈香類型,但影響了果實各類型香氣的氣味活性值。2023年試驗中僅氨基酸硒肥處理較對照提高了水果類、植物類香氣的氣味活性值。2024年試驗中氨基酸硒肥和水溶性硅肥處理均提高了各類型香氣的氣味活性值,其中氨基酸硒肥處理水果類、植物類、脂肪類和甜香類香氣的氣味活性值較對照分別提高 56.52%.29.06%.38.86% 和 91.20% ;水溶性硅肥處理水果類、植物類、脂肪類和甜香類香氣的氣味活性值較對照分別提高 30.70% 、 53.72% F 76.41% 和
35.78% 。同時氨基酸硒肥、水溶性硅肥處理均檢測出對照不含有的香料類氣味類型,使處理后的金黃金桃果實香氣更復雜濃郁、更具風味。同時發(fā)現(xiàn)2024年試驗中的金黃金桃果實的氣味活性值遠高于2023年,體現(xiàn)出果實香氣品質(zhì)受年際效應、氣候因素和栽培條件[2]的影響較大。
2.4金黃金桃果實品質(zhì)的主成分分析及綜合評價
根據(jù)主成分分析結(jié)果,結(jié)合隸屬函數(shù)分析,綜合評價兩種葉面肥對金黃金桃果實品質(zhì)的影響。結(jié)果顯示兩地試驗中均為氨基酸硒肥效果最好(表5)。
3討論
葉面肥作為一種高效的植物營養(yǎng)補充方式,在果樹上已有廣泛應用。不同種類葉面肥對果樹生長發(fā)育和果實品質(zhì)的影響存在差異。前人研究表明,噴施氨基酸葉面肥能夠顯著提高桃[21]、葡萄[5,7,22、蘋果[46.8.23]、梨[24]等果樹的葉片葉綠體色素含量、單果質(zhì)量、產(chǎn)量和可溶性固形物含量等指標。在本研究中,氨基酸硒肥處理的金黃金桃的單株產(chǎn)量、單果質(zhì)量和揮發(fā)性風味物質(zhì)的種類和數(shù)量均高于對照,較對照多檢測出糖醛、5-羥甲基糠醛和y-己內(nèi)酯3種揮發(fā)性物質(zhì)。但可溶性固形物含量、可滴定酸含量等與對照無顯著差異,這與史祥賓等[25在秋白梨上的研究結(jié)果類似,噴施氨基酸硒葉面肥顯著提高了秋白梨的單果質(zhì)量,但未對可溶性固形物含量有顯著影響。范嘉林等2研究發(fā)現(xiàn)噴施氨基酸硒葉面肥的濃度過低或過高也會導致果實品質(zhì)和產(chǎn)量與對照無顯著差異。彭智平等研究表明,在沙糖橘葉片上噴氨基酸葉面肥果實增產(chǎn)顯著,但對可溶性固形物含量影響較小,部分處理的果實維生素C含量低于對照。筆者在本研究中發(fā)現(xiàn)噴施氨基酸硒葉面肥未對果實可溶性固形物含量、可滴定酸含量造成顯著影響,可能是與增產(chǎn)導致稀釋效應有關。
硅是地殼中含量最豐富的元素之一,能夠提高植物對一系列非生物與生物脅迫的抗性,對植物在逆境中生長有著重要作用[2,相關研究主要集中在提高植物抗逆性和喜硅禾本科植物上,對于硅肥在果樹上的應用研究較少。筆者在本研究中發(fā)現(xiàn),水溶性硅肥處理的金黃金桃在葉片厚度、比葉重、單株產(chǎn)量及單果質(zhì)量和果實揮發(fā)性風味物質(zhì)含量上均有顯著提高,較對照多檢測出 (E,E) -2,4-己二烯醛、乙酸乙酯和y-己內(nèi)酯3種揮發(fā)性物質(zhì),這與唐笑2的研究一致,施用水溶硅肥能夠增加果實揮發(fā)性風味物質(zhì)的種類和相對含量。
桃果實香氣由多種揮發(fā)性物質(zhì)作用而成,各揮發(fā)性成分對果實香氣的貢獻依據(jù)氣味活性值決定。C6醛、醇類屬于植物類香氣物質(zhì),或稱“青香型”,酯類和內(nèi)酯類屬于水果類香氣物質(zhì),或稱“果香型\"[30]。金黃金桃果實中的青葉醛是其主要的\"青香型\"物質(zhì);乙酸乙酯、乙酸己酯、乙酸葉醇酯等低閾值類酯類化合物是金黃金桃水果類香氣重要成分,而在各類桃果實中普遍存在且閾值低的y-癸內(nèi)酯,僅在2023年水溶性硅肥處理中檢測到。
果實的成熟度不同,果實釋放的香氣組分不同,成熟度高,香氣更濃,成分更復雜。桃是乙烯躍變型果實,采后成熟過程是桃果實香味急劇增加的時期,以“青香型\"香氣物質(zhì)的大量減少和“果香型\"香氣物質(zhì)含量的急劇增加為主要特征[3-32]。外源施用氨基酸、硅元素能夠緩解植物多種生物以及非生物脅迫,改善植株生長發(fā)育狀況,使果實更能體現(xiàn)出本身的香氣。筆者在本研究中發(fā)現(xiàn)醛類物質(zhì)是金黃金桃果實的主要揮發(fā)性成分,含量占比均能達到 47.04%~ 83.02% ;其植物類與水果類香氣活性在 0.64~0.96 之間,以水果類、植物類香氣類型為主。僅2024年氨基酸硒肥處理的金黃金桃果實植物類與水果類香氣活性值低于對照??紤]到本研究中采用的金黃金桃為商品成熟期,并未達到生理成熟期,而氨基酸硒肥和水溶性硅肥葉面肥處理后能夠增加各類香氣物質(zhì)含量和種類,對果實采后成熟中“青香型”與“果香型\"物質(zhì)的轉(zhuǎn)換有重要意義,具體影響有待進一步研究。
4結(jié)論
施用氨基酸硒肥、水溶硅肥葉面肥均能夠顯著提高金黃金桃葉片發(fā)育質(zhì)量,提高單株產(chǎn)量、平均單果質(zhì)量以及果實酯類、醛類揮發(fā)性物質(zhì)的含量,為果實賦予更強烈的水果類、植物類香氣,提高果實綜合品質(zhì)。其中以自末花期開始每15d噴施1次600倍氨基酸硒葉面肥、共噴施7次的效果最佳。
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