中圖分類號(hào):S662.1 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1009-9980(2025)07-1492-10
Abstract: 【Objective】Bagging is a significant practice in peach cultivation,which can alter the light conditions of the fruit and minimize mechanical damage to the fruit,enhance surface smoothness,and improve the overall visual quality of peaches. Additionally, bagging can reduce pesticide residues on peaches,thereby decreasing food safety risk.However,research on the impact of bagging on the nutritional quality of peach fruit is limited. The study aimed to evaluate the impact of bagging on the nutritional quality and mineral element content of peach fruit in various varieties.【Methods】Three peach varieties from Jiangsu including Baifeng, Xiacui, and Xiahui were tested. The treatment group underwent bagging, while the control group remained untreated. The peach samples at maturity stages were collected,and the fruit mass, firmness and soluble solid content were detected.The content of amino acids,organic acids and total phenols were detected.Mineral elements including macronutrients and micronutrients were analyzed using ICP and ICP-MS.【Results】Among the three varieties, Xiahui had the highest average mass (279.1 g), followedby Baifeng (248.3g) and Xiacui (220.0 g). Xiacui exhibited the highest firmness(5.80), which was 1.87 times and 1.62 times that of Baifeng and Xiahui,respectively.There were no significant differences in the soluble solids content among the different varieties, which ranged from 10.4% to 11.1% 1 (pgt;0.05) ).Foreachvariety, therewereno significant differencesin mass and firmness between the bagged and control samples (pgt;0.05) ).However,comparedwith theunbagged group,the soluble solids content in the bagged group significantly decreased for Baifeng,Xiahui, and Xiacui by 16.6% , 7.5% ,and 17.9% ,respectively (plt;0.05 ). Tthe contents of vitamin C,amino acids,and total phenols in the bagged group,were significantly lower than those in the control group, with reductions of 0.14-0.22,0.07-0.11 and 0.11-0.25 times,respectively ζplt;0.05 ).The soluble sugar content in the bagged group significantly increased by 0.12-0.24 times in Xiahui and Xiacui, but showed no significant change in Baifeng (plt;0.05 ).The bagging significantly increased the contents of succinic acid and citric acid in Baifeng. In Xiacui,bagging significantly elevated the contents of succinic acid,quinic acid,and malic acid,and decreased the citric acid content significantly.Overall the total acid content of bagged fruits in Xiahui was significantly reduced compared with the control fruits.Bagging significantly decreased the levels of Ca, Cu, K, ΔMg ,Sr, Zn,and Ba in all three peach varieties, with reductions ranging from 0.1 to 0.8 times( (plt;0.05) ). Additionally, the bagging reduced the Mnand Al contents in Xiacui and Xiahui by and
times,respectively. The reductions in amino acids and mineral elements might be atributed to the effect of bagging on reducing the opening of fruit stomata,leading to decreased water influx and consequently lower levels of photosynthetic products and mineral elements in the peaches.The decrease in total phenol content might be related to reduced fruit coloration due to bagging.【Conclusion】The bagging did not affct fruit mass or firmnessbut significantly reduced the contents of soluble solids,vitamin C,amino acids,total phenols,and most mineral elements,leading to reduce the nutritional quality of the peach fruits. These findings would provide valuable insights for the assessment of peach cultivation practices.
Keywords:Peach fruit; Bagging;Nutritional quality; Mineral elements
桃為薔薇科李屬植物,是中國的第三大落葉果樹,富含礦物質(zhì)元素、蛋白質(zhì)、糖、脂肪、維生素等多種對(duì)人體有益的營養(yǎng)成分[2]。中國桃果實(shí)種類豐富,依據(jù)果皮顏色(黃色、白色、紅色)和果肉溶質(zhì)(綿、軟溶質(zhì)、硬溶質(zhì)、不溶質(zhì))等分為多個(gè)類型。隨著生活水平的提高,人們對(duì)水果品質(zhì)的需求也不斷提升。不同類別的桃果實(shí)口感及風(fēng)味差異較大,可滿足不同消費(fèi)者的需求[45]。栽培條件是影響桃果實(shí)品質(zhì)的重要因素之一,常見的栽培條件包括土肥管理、避雨栽培、延時(shí)補(bǔ)光、農(nóng)藥施用、灌溉技術(shù)、果實(shí)套袋等。科研人員往往多關(guān)注栽培技術(shù)對(duì)桃果實(shí)產(chǎn)量及糖酸度的影響,而忽略了對(duì)桃果實(shí)內(nèi)在營養(yǎng)品質(zhì)的影響。因此,系統(tǒng)解析栽培條件對(duì)桃果實(shí)營養(yǎng)品質(zhì)的影響,有助于優(yōu)化栽培技術(shù),推動(dòng)中國桃產(chǎn)業(yè)的高質(zhì)量發(fā)展。
果實(shí)套袋技術(shù)在全球范圍內(nèi)廣泛應(yīng)用于果樹生產(chǎn),已經(jīng)成為了生產(chǎn)無公害、綠色果品的主要途徑和技術(shù)措施之一[7-8]。套袋能夠通過人工方式調(diào)節(jié)果實(shí)的光照條件,減少果實(shí)的外部機(jī)械損傷,提升表面光潔度,從而改善果實(shí)的整體外觀品質(zhì),同時(shí)還可以減少桃果實(shí)中的農(nóng)藥殘留,降低食品安全風(fēng)險(xiǎn)[910]。項(xiàng)玉英等研究表明,套袋能明顯提高新川中島桃果實(shí)的外觀及內(nèi)在品質(zhì),提高其商品性和經(jīng)濟(jì)效益。顏少賓等[研究表明,對(duì)黃肉桃進(jìn)行套袋處理,可提高黃肉桃果皮的表面光澤度、鮮艷度以及 a -胡蘿下素 ,β. -胡蘿卜素含量。陳茜茜等[3研究了6種農(nóng)藥在套袋后的桃果實(shí)中的殘留量,發(fā)現(xiàn)除毒死蜱外其余農(nóng)藥的殘留量均低于定量限。但是,套袋對(duì)桃果實(shí)的生長發(fā)育及內(nèi)在品質(zhì)還會(huì)造成一定程度的負(fù)面影響。杜紀(jì)紅等[4的研究結(jié)果表明,桃果實(shí)在一直套袋的條件下,果皮中的葉綠素、類胡蘿卜素含量會(huì)迅速下降,從而導(dǎo)致花色苷的積累受到強(qiáng)烈抑制,果實(shí)著色變淺。何平等[5的研究結(jié)果表明,套袋處理提高了桃果實(shí)中的醛類、醇類和酸類物質(zhì)含量,降低了脂類物質(zhì)含量,桃果實(shí)中的整體香氣物質(zhì)成分含量低于對(duì)照組,對(duì)果實(shí)風(fēng)味產(chǎn)生了一定的負(fù)面影響。
目前的報(bào)道多研究套袋對(duì)桃生長、著色的影響,缺乏套袋對(duì)桃果實(shí)品質(zhì)影響的系統(tǒng)性研究。
筆者以江蘇地區(qū)3個(gè)主產(chǎn)品種白鳳、霞暉、霞脆為研究試材,三者品種特性存在較大差異,其中白鳳是軟溶質(zhì)白肉桃,霞暉是硬溶質(zhì)白肉桃,霞脆是不溶質(zhì)黃肉桃。對(duì)于這3個(gè)品種的桃果實(shí),均在果實(shí)硬核期進(jìn)行套袋處理,采前不需撕袋,對(duì)照組桃果實(shí)不做處理,采集各品種成熟期的桃果實(shí),測定果實(shí)質(zhì)量、硬度、可溶性固形物含量,測定果肉中氨基酸、有機(jī)酸、總酚、大量元素和微量元素含量,分析套袋技術(shù)對(duì)成熟期桃果實(shí)營養(yǎng)品質(zhì)及礦質(zhì)元素含量的影響,研究結(jié)果將有助于桃產(chǎn)業(yè)的健康發(fā)展。
1 材料和方法
1.1材料
供試桃品種為江蘇省農(nóng)業(yè)科學(xué)院溧水基地栽培的白鳳、霞暉和霞脆(圖1),試驗(yàn)地條件和肥水管理一致,樹齡一致,疏果定果后對(duì)同一棵樹的桃果實(shí)隨機(jī)套袋。3個(gè)品種均在果實(shí)硬核期進(jìn)行套袋處理,袋子為白色的單層袋,于果實(shí)采收時(shí)將果實(shí)和果袋一并摘下。桃子成熟后,從樹冠外圍中上部隨機(jī)采摘套袋與不套袋的每個(gè)品種各50個(gè)果實(shí),立即放入帶有冰袋的泡沫箱保存并帶回實(shí)驗(yàn)室進(jìn)行測定分析。每組隨機(jī)選取20個(gè)桃用于測定果實(shí)質(zhì)量、硬度和可溶性固形物含量,其余30個(gè)桃果實(shí)每6個(gè)混成一份樣品,共5個(gè)重復(fù)。桃果實(shí)樣品去除果皮,將可食用部分切碎混勻,迅速放入液氮速凍并研磨成粉末,密封后置于DW-86L7超低溫冰箱(海爾特種冰柜有限公司) -80°C 保存。
1.2 方法
1.2.1果實(shí)質(zhì)量、硬度、可溶性固形物含量測定采用GY-4果實(shí)硬度計(jì)(山東恒美電子科技)測定果實(shí)胴部去皮后的硬度;采用AP2500-0電子天平(瑞士Ohaus公司)測定單果質(zhì)量;采用PAL-1數(shù)顯手持糖度計(jì)(日本愛拓)測定桃果實(shí)中的可溶性固形物含量。
1.2.2維生素C、有機(jī)酸含量測定采用高效液相色譜法(HPLC)[測定桃果實(shí)中的維生素C和有機(jī)酸(琥珀酸、酒石酸、奎寧酸、檸檬酸、蘋果酸)含量,具體為:稱取 2.0g 桃肉樣品,加入 8mL1% 草酸的水溶液,勻漿后 3000r?min-1 斡旋 2min,40°C 超聲提取20min,4000r?min-1 離心 5min ,取上清液過濾膜,經(jīng)Waters2695高效液相色譜儀(美國Waters公司)檢測。色譜柱為InertSustain C18(250mm×4.6mm .5μm) ,流動(dòng)相A為 0.1% 磷酸水溶液,流動(dòng)相B為甲醇,梯度洗脫,進(jìn)樣體積為 20μL ,紫外檢測波長分別為254nm 和 210nm ,柱溫為 30°C ,流速為 0.8mL?min-1 。總酸含量為各有機(jī)酸含量的總和。
1.2.3可溶性糖、總酚、總氨基酸含量測定采用檢測試劑盒測定桃果實(shí)中的總酚、總氨基酸、可溶性糖含量,試劑盒由南京建成生物工程研究所提供,貨號(hào)依次是A143-1-1、A026-1-1、A145-1-1??偡雍繙y定時(shí),以沒食子酸為標(biāo)準(zhǔn)品,在 760nm 波長處測定吸光度,并繪制標(biāo)準(zhǔn)曲線計(jì)算總酚含量。
1.2.4礦質(zhì)元素含量測定參照GB5009.268—2016《食品安全國家標(biāo)準(zhǔn)食品中多元素的測定》方法對(duì)桃果實(shí)中礦質(zhì)元素含量進(jìn)行測定。準(zhǔn)確稱取0.1g 樣品(精確至 0.001g) 于微波消解管中,加入5mL 超純 HNO3 (國藥集團(tuán)化學(xué)試劑有限公司),置于預(yù)熱消解儀中, 100°C 預(yù)消解 1h ,直至肉眼看不到桃纖維為止;冷卻至常溫,加入 3mL 30%H2O2 (國藥集團(tuán)化學(xué)試劑有限公司),并置于微波消解儀中消解;消解完成后,置于預(yù)熱消解儀中,設(shè)置150°C ,趕酸 2h ,去離子水定容至 25mL ,同時(shí)做空白試驗(yàn)。PlasmaQuant電感耦合等離子體發(fā)射光譜儀(德國Analytikjena公司)測定樣品中大量元素鉀(K)、鎂 (Mg )、鈣(Ca)含量,AP2500-0電感耦合等離子體質(zhì)譜儀(美國珀金埃爾默)測定樣品中微量元素鋁(AI)、鐵(Fe)、鈉(Na)、硼(B)、鋅(Zn)、銅 (Cu) 小錳(Mn)、鈦(Ti)、鍶(Sr)、鋇(Ba)、鎵(Ga)、鉬(Mo)含量。
1.3 數(shù)據(jù)處理
基于Spearman相關(guān)性分析計(jì)算各指標(biāo)之間的相關(guān)性;基于t檢驗(yàn)進(jìn)行差異顯著性分析,以 plt;0.05 為差異具有統(tǒng)計(jì)學(xué)意義。
2 結(jié)果與分析
2.1 表型指標(biāo)分析
3個(gè)品種中,整體上霞暉平均單果質(zhì)量最高(279.1g) ,其次是白鳳 (248.3g) 和霞脆 (220.0g) 。霞脆硬度最高,分別是白鳳和霞暉的1.87倍和1.62倍。各品種可溶性固形物含量之間沒有顯著差異,均在 10.4%~11.1% 。同一品種,套袋組和對(duì)照組樣品單果質(zhì)量和硬度指標(biāo)之間沒有顯著差異,但相比于對(duì)照組,套袋組的白鳳、霞暉、霞脆的可溶性固形物含量分別顯著降低 16.6%.7.5%.17.9% 。由此說明,套袋處理不會(huì)影響果實(shí)質(zhì)量和硬度,但會(huì)降低桃果實(shí)的可溶性固形物含量(圖2)。
2.2維生素C、氨基酸、總酚、可溶性糖含量的變化
3個(gè)品種中,整體上白鳳、霞暉中的維生素C和可溶性糖含量較高,分別為 17.6,16.5mg?100g-1 和27.0、24.3g?100g-1, 霞脆中的含量最低( 12.3,19.6g?100g-1) 。霞暉中氨基酸和總酚含量最高,分別為32.60和47.10μmol?mg-1 ,分別是白鳳和霞脆的1.1、1.2倍和
*表示在0.05水平差異顯著,**表示在0.01水平差異極顯著,*** 表示在0.001水平差異極顯著,ns表示差異不顯著。下同。 * represents significant difference at O.O5 level, ** represents extremely significant difference at O.O1 level,*** represents extremely significant differenceat O.Oo1 level,nsrepresentsno significant difference.The same below.
1.4、1.2倍。相對(duì)于對(duì)照組,3個(gè)品種套袋組中維生素C、總酚含量分別顯著降低 13.7%~21.9%?11.4%~ 24.9% 。霞脆中,套袋處理組可溶性糖含量顯著增加0.24倍,但在白鳳和霞暉中沒有顯著變化。由此說明,套袋處理可以降低桃果實(shí)維生素C、氨基酸和總酚含量,但可提高部分品種桃的可溶性糖含量(圖3)。
2.3 有機(jī)酸含量的變化
筆者測定桃樣品中5種有機(jī)酸含量,發(fā)現(xiàn)各品種間有機(jī)酸含量差異較大。白鳳中蘋果酸含量(0.725mg?g-1) 顯著低于霞脆 (3.825mg?g-1) 和霞暉( (2.950mg?g-1) 。霞暉中,琥珀酸 (1.525mg?g-1) 、檸檬酸 (1.325mg?g-1) 含量顯著高于白鳳、霞脆。霞脆中,奎寧酸含量 (1.082mg?g-1) 顯著高于白鳳(0.625mg?g-1) 和霞暉 (0.918mg?g-1) ,但霞脆中,酒石酸含量 (0.175mg?g-1) 顯著低于白鳳 (0.925mg?g-1) 和霞暉 (0.575mg?g-1) 。霞暉和霞脆的總酸含量較高,分別是 7.275,6.900mg?g-1 ,而白鳳的總酸含量最低 (3.925mg?g-1) ,顯著低于霞暉和霞脆(圖4)。
相比于對(duì)照組,套袋處理顯著提高了白鳳果實(shí)琥珀酸、檸檬酸含量,依次顯著增加2.5倍、0.9倍,但酒石酸含量卻顯著降低了 83% 。套袋處理顯著降低了霞暉果實(shí)琥珀酸、奎寧酸、蘋果酸含量,但檸檬酸含量卻顯著提高。霞脆中,套袋處理顯著提高了奎寧酸和蘋果酸含量,但琥珀酸 (0.508mg?g-1) 、檸檬酸 (0.450mg?g-1) 含量卻顯著降低。相比于對(duì)照組,套袋處理顯著降低了霞暉中總酸含量,提高了白鳳和霞脆中總酸含量,但差異不顯著(圖4)。
2.4礦質(zhì)元素含量分析
各品種桃果實(shí)中K、Mg、Ca、Na含量較高,范圍依次為 189.0~234.1?6.2~9.7.3.9~9.5.0.9~1.1mg.kg-1s 相比于對(duì)照組,套袋處理均可以顯著降低3個(gè)品種桃果實(shí)中 Ca,Cu,K,Mg,Sr,Zn,Ba 含量,降低倍數(shù)在 12%~80% 之間。此外,套袋處理均可以降低霞脆和霞暉品種桃果實(shí)中Mn和A1含量,依次降低 20%~ 50% , 10%~20% 。以上結(jié)果可以表明,套袋處理可降低桃果實(shí)中大部分礦質(zhì)元素含量(表1)。
2.5相關(guān)性分析
基于Spearman相關(guān)性分析計(jì)算套袋處理對(duì)桃各品質(zhì)及礦質(zhì)元素含量之間的關(guān)聯(lián)性。以白鳳為例(圖5),可溶性固形物含量、總酚含量、維生素C含量之間呈顯著正相關(guān) (plt;0.05) ,且均與 Cu、Sr元素含量呈顯著正相關(guān) (plt;0.05) ,但與琥珀酸、檸檬酸、蘋果酸以及A1、Fe、 Mn 等礦質(zhì)元素含量
呈顯著負(fù)相關(guān) (plt;0.05) 。氨基酸含量與Zn含量呈顯著正相關(guān),琥珀酸含量與檸檬酸、蘋果酸含量呈顯著正相關(guān) (plt;0.05) 。
3討論
筆者發(fā)現(xiàn)套袋對(duì)3個(gè)品種桃果實(shí)的質(zhì)量和硬度沒有顯著影響,這與Miqueloto等[8的研究結(jié)果相一致。套袋處理可顯著降低各品種桃果實(shí)的可溶性固形物含量,這可能是由于套袋會(huì)在一定程度上抑制光合作用的產(chǎn)物向果肉中運(yùn)輸,導(dǎo)致果實(shí)可溶性固形物含量偏低[19]。研究表明,套袋顯著降低了蘋果果實(shí)中的可溶性固形物含量2,但可提高葡萄中可溶性固形物含量[21],由此可以說明,套袋對(duì)果實(shí)可溶性固形物含量的影響受水果種類的影響。
營養(yǎng)品質(zhì)分析的結(jié)果表明,套袋處理可以顯著降低桃果實(shí)的維生素C和總酚含量,提高桃果實(shí)中的可溶性糖含量。王磊等[22發(fā)現(xiàn),套袋處理降低了番茄果實(shí)中的維生素C含量,這與筆者的研究結(jié)果一致。王睿等研究發(fā)現(xiàn),套袋處理降低了赤霞珠葡萄果實(shí)中的總酚和總花色素含量[23],套袋處理降低Concorde梨果皮中酚類化合物含量[24],與筆者的研究結(jié)果一致。已有文獻(xiàn)報(bào)道,套袋顯著影響果實(shí)氨基酸含量。樊進(jìn)補(bǔ)等[25研究發(fā)現(xiàn),套袋會(huì)改變鴨梨果肉中的氨基酸含量,林炎娟等[2研究發(fā)現(xiàn),套袋處理對(duì)部分氨基酸含量影響顯著。氨基酸種類和含量是決定果實(shí)滋味的重要因素,由此推測,套袋處理通過影響氨基酸代謝途徑從而影響果實(shí)風(fēng)味[7]。
相比于對(duì)照組,套袋處理的白鳳果實(shí)琥珀酸、檸檬酸含量顯著提高,但酒石酸含量顯著降低。套袋處理的霞暉果實(shí)琥珀酸、奎寧酸、蘋果酸含量顯著降低,檸檬酸含量卻顯著提高。套袋處理的霞脆果實(shí)奎寧酸和蘋果酸含量顯著提高,但琥珀酸和檸檬酸含量顯著降低。已有文獻(xiàn)報(bào)道,套袋顯著影響果實(shí)有機(jī)酸含量。王璐偉等2發(fā)現(xiàn),套袋的天使紅石榴中的蘋果酸含量較對(duì)照組增加了 12%~45% ,檸檬酸含量較對(duì)照組增加了 5%~13% 。蘭昌文等[2研究發(fā)現(xiàn),套袋顯著降低了葡萄中酒石酸和蘋果酸含量。果實(shí)中有機(jī)酸不僅參與植物的呼吸作用和能量代謝,還是氨基酸、次級(jí)代謝產(chǎn)物合成的底物[30]。套袋可以降低各品種果實(shí)中氨基酸、維生素C含量,但對(duì)各品種果實(shí)中有機(jī)酸含量影響差異較大,這可能是桃品種及果實(shí)肉質(zhì)質(zhì)地差異引起的。
套袋處理可降低3個(gè)品種桃果實(shí)中大多數(shù)礦質(zhì)元素含量,尤其是Cu、Zn、Ca、K、Mg含量等。礦質(zhì)元素在桃果實(shí)發(fā)育過程發(fā)揮著重要作用,B能夠促進(jìn)桃果實(shí)中可溶性糖的合成;K能夠促進(jìn)果實(shí)內(nèi)淀粉向可溶性糖的轉(zhuǎn)換;Mg對(duì)光合作用有重要作用,還是多種酶的活化劑,能夠促進(jìn)果實(shí)中糖類的轉(zhuǎn)化和代謝[。套袋可能會(huì)影響果實(shí)的氣孔導(dǎo)度,氣孔影響植物蒸騰流[],而蒸騰流中有很多礦質(zhì)元素。果實(shí)的氣孔導(dǎo)度降低[],向果實(shí)中流入的水分減少,致使桃果實(shí)中礦質(zhì)元素含量減少。柳小蘭等34發(fā)現(xiàn),套袋處理可以提高蘋果中Pb、Cd、As、Se、Fe、Ni和Sr等元素含量,降低Zn、Co、B、Mn、Ca和Mg含量,而賈曉輝等[35]研究發(fā)現(xiàn),套袋處理提高了梨果實(shí)中的P、K、Mg和B含量,降低了N和Ca含量,這些結(jié)果與筆者的研究結(jié)果存在一定差異,可能是水果類別差異導(dǎo)致的。
桃果套袋在一定程度上降低桃果實(shí)品質(zhì),但套袋的優(yōu)勢(shì)是提高桃外觀、增強(qiáng)果實(shí)抗性和降低桃果實(shí)農(nóng)藥殘留風(fēng)險(xiǎn),這些優(yōu)勢(shì)不可忽視[3。現(xiàn)在由于勞動(dòng)力短缺,提倡簡約化栽培模式,但是否需要套袋還受多種因素的影響。對(duì)于抗逆性強(qiáng)、不易裂果、病蟲害發(fā)生少的地區(qū)可以選擇不套袋,但對(duì)于容易裂果、抗逆性差、病蟲害嚴(yán)重的地區(qū)可以選擇套袋,以保證桃果實(shí)產(chǎn)量及食品安全。
4結(jié)論
筆者以江蘇區(qū)域品種白鳳、霞暉、霞脆為研究試材,測定套袋技術(shù)對(duì)桃果實(shí)營養(yǎng)品質(zhì)及礦質(zhì)元素含量的影響。結(jié)果表明,套袋處理對(duì)果實(shí)質(zhì)量、硬度沒有顯著影響,但顯著降低可溶性固形物、維生素C、總酚及大部分礦質(zhì)元素(如Ca、Cu、K、Mg、Zn等)的含量。礦質(zhì)元素含量的降低可能是由于套袋影響果實(shí)氣孔的開關(guān),向果實(shí)中流入的水變少,致使桃果實(shí)中礦質(zhì)元素、光合作用產(chǎn)物(氨基酸等)流入減少,而總酚含量降低與套袋影響果實(shí)著色有關(guān)。本研究系統(tǒng)解析了套袋對(duì)桃果實(shí)營養(yǎng)品質(zhì)的影響,為桃果實(shí)栽培評(píng)價(jià)提供了參考。
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