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基于廣泛靶向代謝組學(xué)分析不同成熟度桂葡柚1號(hào)果肉成分差異

2024-12-31 00:00:00劉福平廖惠紅王茜陳東奎韋持章黃宏明黃其椿汪妮娜
熱帶作物學(xué)報(bào) 2024年12期
關(guān)鍵詞:葡萄柚酚酸黃酮類

摘""要:廣西種植的桂葡柚1號(hào)葡萄柚豐產(chǎn)、穩(wěn)產(chǎn)性好,其果肉多汁、酸甜適宜。為了解其不同成熟度果肉成分差異,測(cè)定其不同成熟度果肉廣泛靶向代謝組,篩選差異代謝物并進(jìn)行代謝通路分析。結(jié)果顯示:從桂葡柚1號(hào)中共檢測(cè)到529種代謝物,其中黃酮159種,氨基酸及其衍生物和酚酸類各64種,其他類包含糖、醇類和維生素共53種,脂質(zhì)51種,木脂素和香豆素40種,核苷酸及其衍生物34種,生物堿29種,有機(jī)酸28種,萜類5種,鞣質(zhì)2種。不同成熟度果肉差異代謝物主要有黃酮、酚酸類、氨基酸及其衍生物、脂質(zhì)、木脂素和香豆素,且大多下調(diào)。隨著果實(shí)成熟度上升,下調(diào)的酚酸、氨基酸及其衍生物、脂質(zhì)等種類增加,且大部分呈持續(xù)下調(diào)趨勢(shì);大部分下調(diào)黃酮的相對(duì)含量在果實(shí)成熟初期大幅下降,到果實(shí)成熟后期又有增加趨勢(shì),下調(diào)黃酮種類先增加后減少,在果實(shí)成熟中期最多;辛弗林、亞精胺、甜菜苷、諾米林酸、(-)-莽草酸的相對(duì)含量持續(xù)降低;檸檬苦素的相對(duì)含量在果實(shí)成熟初期增加,在成熟中后期顯著下調(diào)。在果實(shí)成熟初期,差異代謝物富集最顯著的是類黃酮生物合成通路,但在整個(gè)成熟過(guò)程中,差異代謝物富集最顯著的是苯丙烷生物合成通路。G2果實(shí)口感最佳,可溶性固形物達(dá)12%,固酸比為23.24,適宜鮮食,但該時(shí)期咖啡酸、阿魏酸等酚酸類物質(zhì),以及異槲皮苷、金絲桃苷等黃酮顯著下降。研究表明,桂葡柚1號(hào)果肉代謝物種類多、營(yíng)養(yǎng)和功能成分豐富,鮮食適宜采摘時(shí)間為10月下旬至12月上旬,用于保健或藥用的果實(shí)應(yīng)根據(jù)功效需求提前采摘。該研究為桂葡柚1號(hào)葡萄柚的營(yíng)養(yǎng)及功能成分研究提供一定的理論基礎(chǔ),為不同用途的果實(shí)最佳采摘成熟度提供參考。

關(guān)鍵詞:桂葡柚1號(hào);成熟度;代謝組學(xué);果肉成分;果實(shí)品質(zhì)中圖分類號(hào):S666.3""""""文獻(xiàn)標(biāo)志碼:A

Differential"Analysis"of"Flesh"Compounds"of"Grapefruit"of"Guipuyou"No."1"at"Different"Maturation"Stages"Based"on"Widely"Targeted"Metabolomics

LIU"Fuping,"LIAO"Huihong*,"WANG"Xi,"CHEN"Dongkui,"WEI"Chizhang,"HUANG"Hongming,"HUANG"Qichun,"WANG"Nina

Horticulture"Research"Institute,"Guangxi"Academy"of"Agricultural"Sciences"/"Nanning"South"Subtropical"Fruit"Tree"Scientific"Observation"Experimental"Station,"Ministry"of"Agriculture"and"Rural"Affairs"/"National"Germplasm"Resources"Observation"Experiment"Station"in"Wuming"/"Guangxi"Engineering"Technology"Research"Center"of"Citrus"Huanglongbing"Prevention"and"Control,"Nanning,"Guangxi"530007,"China

Abstract:"Grapefruit"of"Guipuyou"No."1"planted"in"Guangxi"has"high"and"stable"yield,"and"the"flesh"is"juicy,"suitably"acidic"and"sweet."The"widely"targeted"metabolisms"of"flesh"was"determined,"the"differential"metabolites"were"screened"and"the"metabolic"pathway"was"analyzed"to"understand"the"difference"ofnbsp;flesh"composition"at"different"maturity"stages."A"total"of"529"metabolites"were"detected"from"grapefruit"of"Guipuyou"No."1,"including"159"flavonoids,"64"Phenolic"acids,"64"amino"acids"and"derivatives,"53"others"(saccharides"and"alcohols,vitamin,"others),"51"lipids,"40"lignans"and"coumarins,"34"nucleotides"and"derivatives,"29"alkaloids,"28"organic"acids,"5"terpenoids"and"2"tannins."The"differential"metabolites"at"different"maturity"stages"mainly"included"flavonoids,"phenolic"acids,"amino"acids"and"their"derivatives,"lipids,"lignans"and"coumarins,"and"most"of"them"were"down-regulated."The"down-regulated"types"of"phenolic"acids,"amino"acids"and"their"derivatives,"lipids"and"other"types"increased,"and"most"of"them"showed"a"continuous"downward"trend"with"the"increase"of"fruit"ripeness."Most"of"the"down-regulated"flavonoids"showed"a"sharp"decline"in"the"early"stage"of"fruit"ripening,"and"then"increased"in"the"late"stage"of"fruit"ripening."The"types"of"down-regulated"flavonoids"first"increased"and"then"decreased,"with"the"most"in"the"middle"stage"of"fruit"ripening."The"relative"contents"of"synephrine,"spermidine,"betaine,"shikimic"acid"were"consistently"decreasing."The"relative"content"of"limonin"increased"in"the"early"stage"of"fruit"ripening,"and"decreased"significantly"in"the"middle"and"late"stage"of"fruit"ripening."The"most"significant"enrichment"pathway"of"differential"metabolites"was"flavonoid"biosynthesis"in"the"early"stage"of"fruit"ripening,"but"it"was"phenylpropanoid"biosynthesis"during"the"whole"ripening"process."The"fruit"of"G2"had"the"best"taste,"with"soluble"solids"of"12%"and"solid-acid"ratio"of"23.24,"which"was"suitable"for"fresh"eating."However,"phenolic"acids"such"as"caffeic"acid"and"ferulic"acid,"flavonoids"such"as"isoquercitrin"and"hyperoside"decreased"significantly"during"this"period."There"were"many"kinds"of"metabolites"in"the"pulp"of"grapefruit"of"Guipuyou"No."1,"which"was"rich"in"nutritional"and"functional"components."The"best"picking"time"for"fresh"food"is"from"late"October"to"middle""November."Fruits"used"for"health"care"or"medicinal"purposes"should"be"picked"in"advance"according"to"the"efficacy"requirements."This"study"would"provide"a"theoretical"basis"for"the"study"on"the"nutritional"and"functional"components"of"grapefruit"of"Guipuyou"No.1,"and"provide"a"reference"for"the"best"harvest"maturity"of"its"different"uses.

Keywords:"grapefruit"of"Guipuyou"No."1;"maturity;"metabolomic;"fruit"compounds;"fruit"quality

DOI:"10.3969/j.issn.1000-2561.2024.12.001

葡萄柚(Citrus"paradisi"Macf.)屬蕓香科柑橘屬,果實(shí)風(fēng)味獨(dú)特,不僅富含維生素、有機(jī)酸、糖、蛋白質(zhì)、礦質(zhì)元素、膳食纖維等營(yíng)養(yǎng)物質(zhì),還含有類黃酮、檸檬苦素類化合物等生物學(xué)活性物質(zhì),具有特殊的醫(yī)療保健功能,是一種鮮食和加工兼用的重要水果,備受歐美發(fā)達(dá)國(guó)家青睞[1-2]。葡萄柚在廣東、福建、四川、云南、廣西等地已有規(guī)模栽培[3-4]。前人在國(guó)內(nèi)葡萄柚種質(zhì)資源、性狀遺傳變異、生物學(xué)特性、栽培技術(shù)與果實(shí)品質(zhì)等方面開展了較多的研究,但對(duì)葡萄柚的健康功效研究較少,且與國(guó)外差距較大[2]。國(guó)外科學(xué)家發(fā)現(xiàn)葡萄柚汁能增加如非洛地平、達(dá)泊西汀、布南色林等某些藥物的生物利用率[5-7],葡萄柚能夠平衡老鼠胰島素和葡萄糖水平[8]等。王琦等[9]也發(fā)現(xiàn)葡萄柚果汁具有明顯延緩果蠅衰老的作用。但是隨著葡萄柚果實(shí)的發(fā)育成熟,檸檬苦素類化合物和柚皮苷、枸橘甙、新橙皮苷、新橙皮素等類黃酮物質(zhì)含量逐漸下降[10]?;趶V泛靶向代謝組學(xué)技術(shù)分析不同成熟度葡萄柚果實(shí)中的代謝成分及差異尚未見(jiàn)報(bào)道。桂葡柚1號(hào)葡萄柚在廣西種植豐產(chǎn)、穩(wěn)產(chǎn)性好,其果肉多汁、酸甜適中[11],本研究旨在通過(guò)測(cè)定其不同成熟度果實(shí)的品質(zhì)和果肉廣泛靶向代謝組,分析其不同成熟度果肉成分和果實(shí)的品質(zhì),為其營(yíng)養(yǎng)及功能成分的研究奠定基礎(chǔ),同時(shí)為鮮食、保健等不同用途桂葡柚1號(hào)果實(shí)的采摘成熟度和采摘時(shí)間提供參考。

1""材料與方法

1.1""材料

以廣西南寧市上林縣白圩鎮(zhèn)桂葡柚1號(hào)基地果實(shí)為供試材料,該基地桂葡柚1號(hào)砧木為酸柚,2019年為第三年掛果。從基地中選取樹勢(shì)、果實(shí)生長(zhǎng)發(fā)育時(shí)期一致的具有代表性的3棵樹,自2019年9月28日(果實(shí)成熟初期)開始采樣,之后每隔24"d取1次樣,共取4次,最后一次采樣時(shí)間為2019年12月9日(果實(shí)成熟后期)。采樣時(shí)從每棵樹東、南、西、北方向各采摘果實(shí)大小、成熟度一致的2個(gè)果,每棵樹8個(gè)果,3棵樹即3個(gè)重復(fù)。采摘當(dāng)天運(yùn)回實(shí)驗(yàn)室,樣品信息見(jiàn)表1。

1.2""方法

1.2.1""果實(shí)品質(zhì)測(cè)定""使用游標(biāo)卡尺測(cè)量果實(shí)縱、橫徑。用電子天平測(cè)量單果質(zhì)量。用手持折光儀測(cè)定果汁可溶性固形物含量。用酸堿滴定法測(cè)定果汁可滴定酸含量。分別采用SPSS"Statistics"23軟件和LSD法開展方差分析和差異顯著性分析,差異顯著性水平為0.05。

1.2.2""代謝組樣品準(zhǔn)備與分析""分析果實(shí)品質(zhì)時(shí),每個(gè)樣品的果肉各用5"mL凍存管取樣,裝好樣品后,將其快速放入液氮中,然后移至–80"℃超低溫冰箱保存。代謝組學(xué)分析樣品的提取流程參照錢瑞[12]的方法,將提取好的樣品保存于進(jìn)樣瓶中,利用超高效液相色譜(UPLC)(Shim-pack"UFLC"SHIMADZU"CBM30A)和串聯(lián)質(zhì)譜(MS/"MS)(Applied"Biosystems"4500"QTRAP)對(duì)樣本進(jìn)行物質(zhì)分離和鑒定[13-14]。

1.2.3""代謝組質(zhì)控樣本與數(shù)據(jù)分析""質(zhì)控樣本(QC)為4組分析樣品提取物的等量混合物。檢測(cè)分析時(shí),每10個(gè)分析樣本中插入1個(gè)質(zhì)控樣本。代謝組數(shù)據(jù)分析基于KEGG化合物數(shù)據(jù)庫(kù)和Met Ware數(shù)據(jù)庫(kù),以及多反應(yīng)監(jiān)測(cè)(MRM)開展樣品代謝物的定性和定量質(zhì)譜分析,代謝物鑒定[15]MS容差和MS2容差設(shè)置為20"mg/kg,保留時(shí)間非常

接近的同分異構(gòu)體,廣靶無(wú)法區(qū)分,根據(jù)購(gòu)買的標(biāo)品提供取代基位點(diǎn)參考,沒(méi)有標(biāo)品的則參考文獻(xiàn)[16]的中位點(diǎn),代謝物的定量利用三重四級(jí)桿質(zhì)譜的多反應(yīng)監(jiān)測(cè)模式分析完成[17]。獲得不同樣本的代謝物質(zhì)譜分析數(shù)據(jù)后,對(duì)所有物質(zhì)質(zhì)譜峰進(jìn)行峰面積積分,并對(duì)其中同一代謝物在不同樣本中的質(zhì)譜出峰進(jìn)行積分校正[18],利用Analyst"1.6.3軟件處理質(zhì)譜數(shù)據(jù),每個(gè)色譜峰的峰面積代表對(duì)應(yīng)物質(zhì)的相對(duì)含量。采用多元統(tǒng)計(jì)分析,對(duì)4組樣品進(jìn)行主成分分析(PCA)[19-20]、聚類分析,根據(jù)正交偏最小二乘法判別分析(OPLS-DA)法預(yù)測(cè)模型的可靠性。采取將fold"change和OPLS-DA模型的VIP值相結(jié)合的方法篩選差異代謝物,fold"change值為2倍以上或0.5倍以下,POLS-DA的VIP≥1則認(rèn)為差異顯著[21]。對(duì)差異顯著的代謝物采用unit"variance"scaling(UV)歸一化處理,通過(guò)R軟件pheatmap包繪制熱圖[22]。利用KEGG數(shù)據(jù)庫(kù)[23]對(duì)差異代謝物通路類型進(jìn)行分類、KEGG富集分析。

2""結(jié)果與分析

2.1""不同成熟度桂葡柚1號(hào)果實(shí)品質(zhì)

由表2可知,G2、G3的單果質(zhì)量、果實(shí)縱、橫徑均與CK差異顯著,G1與各比較組差異均不顯著;G3的果皮厚度最厚,與CK、G1、G2差異顯著,CK、G1、G2之間差異不顯著,原因可能是在2019年12月9日采摘G3樣品時(shí),果實(shí)出現(xiàn)浮皮現(xiàn)象;G2的可溶性固形物最高,G3與G1、G2差異顯著,G1、G2之間差異不顯著。原因可能是2019年10月21日至2019年11月14日為可溶性固形物快速上升期,但在2019年12月9日前果實(shí)可溶性固形物已開始下降;可滴定酸從高到低依次是CK、G1、G2、G3,且差異顯著,說(shuō)明2019年9月28日至12月9日期間果實(shí)可滴定酸持續(xù)下降;CK、G1、G2的固酸比逐漸上升,且差異顯著,G2與G3差異不顯著。此外,各比較組果形指數(shù)差異不顯著。

2.2""代謝組樣本質(zhì)控及統(tǒng)計(jì)分析

采用多元統(tǒng)計(jì)對(duì)樣本(含質(zhì)控樣品)開展主成分(PCA)分析(圖1),PCA結(jié)果顯示檢測(cè)分析樣品之間代謝組有分離趨勢(shì),其中CK、G1、G2各比較組之間在主成分PC1上分離明顯,G2與G3在PC1上分離不明顯,但在PC2上存在顯著分離,因此,各樣品數(shù)據(jù)處理結(jié)果可信,能從總體上反映出不同采收時(shí)期桂葡柚1號(hào)果肉之間的代謝物差異。建立PLS-DA、OPLS-DA模型的R2和Q2模型進(jìn)行分析(表3),PLS-DA模型各比較組的R2X≥0.780,R2Y≥0.999,Q2≥0.956;OPLS-DA模型各比較組的R2X≥0.710,R2Y=1,Q2≥0.982。2個(gè)模型Q2均大于0.9,為出色模型。同時(shí)對(duì)模型進(jìn)行200次排列實(shí)驗(yàn)驗(yàn)證,結(jié)果顯示R2Y'和Q2'都小于原始模型R2Y和Q2,因此該模型有意義,可根據(jù)VIP值來(lái)分析篩選差異代謝物。

2.3""桂葡柚1號(hào)代謝物成分總體分析

從桂葡柚1號(hào)中共檢測(cè)出529種代謝物,根據(jù)種類從多到少,依次為黃酮159種,種類占比30%;氨基酸及其衍生物和酚酸類各64種,種類占比均為12%;其他類(其中糖及醇類42種,維生素9種)53種,占比10%;脂質(zhì)51種,占比9.6%;木脂素和香豆素40種,占比7.5%;核苷

酸及其衍生物34種,占比6.4%;生物堿29種,占比5.4%;有機(jī)酸28種,占比5.2%;萜類和鞣質(zhì)類種類最少(圖2)。

2.4""不同成熟度桂葡柚1號(hào)差異代謝物分析

對(duì)所檢樣品的代謝物進(jìn)行聚類分析,結(jié)果顯示(圖3),隨著果實(shí)逐漸成熟,代謝物的相對(duì)含量發(fā)生變化??傮w上,相對(duì)含量減少的代謝物較多(代謝物在圖上標(biāo)注的顏色從綠色變?yōu)榧t色,即相對(duì)含量逐漸增加,代謝物在圖上標(biāo)注的顏色從紅色變?yōu)榫G色,即相對(duì)含量逐漸減少)。

2.4.1""差異代謝物篩選分析""各比較組總體差異代謝物以下調(diào)為主,按照物質(zhì)一級(jí)分類,下調(diào)的代謝物較多的種類主要有氨基酸及其衍生物、脂質(zhì)、酚酸類、其他類、核苷酸及其衍生物、生物堿等,上調(diào)代謝物較多的主要為木脂素和香豆素,萜類、有機(jī)酸的上調(diào)和下調(diào)種類均較少。CK"vs"G1差異代謝物主要是黃酮,且以下調(diào)種類為主,其中金圣草黃素等3種上調(diào),異槲皮苷等9種下調(diào);

G2"vs"CK差異代謝物增多,下調(diào)代謝物有N-丙酰甘氨酸、L-天冬酰胺、咖啡酸、阿魏酸、綠原酸、單棕櫚酸甘油酯、溶血磷脂酰膽堿14:0"(2n異構(gòu))、異槲皮苷、繡線菊苷、辛弗林、甜菜苷、莽草酸、異歐前胡素等49種,其中下調(diào)代謝物以黃酮、脂質(zhì)、酚酸、氨基酸及其衍生物為主,上調(diào)的代謝物有對(duì)-香豆醇、松柏醇、金圣草黃素、橙皮素O-丙二酰己糖苷、松脂醇、去乙酰諾米林、琥珀酸等19種,上調(diào)代謝物以木脂素、香豆素和酚酸為主;G3"vs"CK下調(diào)代謝物增加至59種,包括乙酰色氨酸、煙胺、原兒茶酸、胞嘧啶、佛手柑素、檸檬苦素、諾米林酸、石榴酸等,上調(diào)代謝物增加至23種,包括L-脯氨酸、異甜橙素等,相對(duì)于G2"vs"CK,下調(diào)的黃酮種類減少,上調(diào)的黃酮種類有所增加。

2.4.2nbsp;"差異代謝物變化趨勢(shì)分析""從表4可以看出,各組的氨基酸及其衍生物差異代謝物共13種,其中L-谷氨酸、DL-谷氨酸、L-天冬酰胺、組胺、氨基乙酰基苯丙氨酸等12種均下調(diào),僅L-脯氨酸上調(diào);脂質(zhì)差異代謝物共14種,其中溶血磷脂酰膽堿15:0、溶血磷脂酰膽堿17:0、2,3-二羥基丙基-9,12,15-十八碳三酸酯-己糖、9,10-環(huán)氧十八碳二烯酸、石榴酸等13種均下調(diào),僅二十碳二烯酸上調(diào),且各比較組下調(diào)氨基酸及其衍生物和脂質(zhì)的相對(duì)含量大多為CKgt;G1gt;"G2gt;G3,即隨著果實(shí)的成熟度增加,代謝物相對(duì)含量持續(xù)下降??傮w上兩類下調(diào)差異代謝物的相對(duì)含量均大于上調(diào)差異代謝物相對(duì)含量,在桂葡柚1號(hào)成熟度上升時(shí),果肉中氨基酸及其衍生物和脂質(zhì)的總含量均下降。

由表5可見(jiàn),各組的差異代謝物中,屬酚酸類的有18種,期間有下調(diào)表達(dá)的為11種,有上調(diào)表達(dá)的為7種。各組的原兒茶酸、香草酸、咖啡酸、阿魏酸、1-O-[(E)-咖啡酰]-β-D-吡喃葡萄糖、阿魏酰葡萄糖、β-D-呋喃果糖基-α-"D-(6-芥子?;┢咸烟擒盏?種酚酸相對(duì)含量均為CKgt;G1gt;G2gt;G3;阿魏酰蘋果酸、新綠原酸*、隱綠原酸等3種酚酸相對(duì)含量為CKgt;G1gt;G2,G3組的相對(duì)含量略大于G2,但遠(yuǎn)小于G1組;阿魏酰芥子酰酒石酸相對(duì)含量為G1組最高,CK和G3組相當(dāng),G2最低。各組的對(duì)-香豆醇、利波腺苷、松柏醇、3-O-對(duì)香豆??鼘幩?、順-3-對(duì)香豆酰奎寧酸、芥子酸吡喃葡萄糖酯等6種酚酸相對(duì)含量G3gt;G2gt;G1gt;CK,二-O-沒(méi)食子酸甲酯G1和G2組較高,CK和G3組較低。隨著果實(shí)的成熟,酚酸差異代謝物大部分相對(duì)含量逐漸減少,呈下調(diào)趨勢(shì)。

黃酮差異代謝物變化趨勢(shì)見(jiàn)表6。各組的黃酮差異代謝物共20種,其中7,8-二羥基-"5,6,4′-三甲氧基黃酮、槲皮素-3-O-β-D-半乳糖苷(金絲桃苷)*、繡線菊苷、橙皮素5-O-葡萄糖苷、槲皮素-3-O-(6″-O-乙酰)-半乳糖苷、槲皮素-3-O-β-D-葡萄糖苷(異槲皮苷)*、槲皮素-7-O-(6″-O-丙二?;?β-D-葡萄糖苷、異鼠李素半乳糖-鼠李糖、柚皮黃素3-O-(3-羥基-3-甲基戊二酸)-葡萄糖苷)、山奈酚-3-O-(6″-O-乙酰)-葡萄糖苷等10種黃酮相對(duì)含量均在成熟初期至中期持續(xù)降低,CKgt;G1gt;G2,尤其在CK至G1時(shí)期大幅下降。成熟后期(G3)相對(duì)含量又開始增加,即隨著果實(shí)成熟度增加,10種黃酮相對(duì)含量呈先下降后上升趨勢(shì)。槲皮素-O-乙?;禾擒障鄬?duì)含量在G1急劇下降至最低水平。槲皮素-3-O-(2″-O-乙酰基)-β-D-葡萄糖醛酸相對(duì)含量在G2最低,G3又有上升。2′-羥基-"3,4,5,4′6′-五甲氧基查耳酮相對(duì)含量在G3最低。異甜橙素、橙皮素O-丙二酰己糖苷等2種黃酮在各時(shí)期的相對(duì)含量為G3gt;G2gt;G1gt;CK,持續(xù)增加。CK至G3,五羥黃酮相對(duì)含量先下降,后上升又下降;金圣草黃素、山奈酚-3-O-β-"(2″-O-乙酰基-β-D-葡萄糖醛酸)的相對(duì)含量先上升,后下降又上升;6,7,8-三羥基-5-甲氧基黃酮先持續(xù)上升后下降。

本研究還發(fā)現(xiàn),辛弗林、亞精胺、甜菜苷、諾米林酸、(-)-莽草酸相對(duì)含量為CKgt;G1gt;G2gt;G3,呈持續(xù)下降趨勢(shì);檸檬苦素的相對(duì)含量在CK至G1時(shí)增加,G1至G3時(shí)逐漸減少,呈先上升后下降趨勢(shì)。

2.4.3""主要差異代謝物成分分析""CK"vs"G1、G1"vs"G2、G2"vs"G3、CK"vs"G3對(duì)比差異倍數(shù)圖列出了差異倍數(shù)排在前20(上調(diào)和下調(diào))的代謝物(圖4)。結(jié)果顯示,在不同成熟階段的桂葡柚1號(hào)葡萄柚中,上調(diào)和下調(diào)的主要差異代謝物不盡相同。CK"vs"G1中,下調(diào)倍數(shù)從大到小依次是黃酮類物質(zhì)槲皮素-O-乙酰基己糖苷(pmb3026)11.19倍,萜類物質(zhì)熊果酸(mws4053)8.01倍,黃酮類物質(zhì)槲皮素-7-O-(6″-O-丙二酰基)-β-D-葡萄糖苷(pmp000589)1.95倍等,上調(diào)倍數(shù)從大到小依次是生物堿椰油酰胺丙基甜菜堿(pmb2211)2.77倍,黃酮類物質(zhì)金圣草黃素(pmp001127)2.59倍,木脂素松脂醇單葡萄糖苷(pmn001378)2.4倍等,主要差異代謝物為黃酮類、萜類、生物堿、木脂素;G1"vs"G2中,下調(diào)倍數(shù)從大到小依次是酚酸類物質(zhì)阿魏酰蘋果酸(Lmhn003074)2.03倍,香豆素異歐前胡素(pmf0526)2.0倍,酚酸類物質(zhì)阿魏酰芥子酰酒石酸(Lmhn003801)1.64倍等,上調(diào)倍數(shù)較大的有酚酸類物質(zhì)對(duì)-香豆醇(mws 0921)10.55倍,木脂素松脂醇單葡萄糖苷(pmn 001378)2.32倍、松脂醇(mws0097)1.49倍,主要差異代謝物為酚酸類、香豆素、木脂素;G2"vs"G3中,下調(diào)倍數(shù)從大到小依次是黃酮類物質(zhì)2′-羥基-3,4,5,4′6′-五甲氧基查耳酮(Lmjp003722)8.37倍,脂質(zhì)單棕櫚酸甘油酯(pmp001284)7.88倍,其他類黃柏酸(Lmzp003694)3.58倍,上調(diào)倍數(shù)較大的有香豆素異氧化前胡內(nèi)酯(pmp 000021)9.47倍、異歐前胡素(pmf0526)3.56倍,黃酮類物質(zhì)繡線菊苷(mws0856)4.59倍,主要差異代謝物為黃酮類、脂質(zhì)、其他類、香豆素。從整個(gè)成熟期來(lái)看,下調(diào)倍數(shù)從高到低依次是黃酮類物質(zhì)槲皮素-"O-乙?;禾擒?1.19倍,脂質(zhì)單棕櫚酸甘油酯9.09倍,黃酮類物質(zhì)2′-羥基-3,4,5,4′6′-五甲氧基查耳酮8.37倍;上調(diào)倍數(shù)從高到低依次是黃酮類物質(zhì)對(duì)-香豆醇11.73倍,香豆素異氧化前胡內(nèi)酯9.47倍,木脂素松脂醇單葡萄糖苷5.15倍等,主要差異代謝物為黃酮類、脂質(zhì)、酚酸類、香豆素、木脂素。

2.4.4""差異代謝物通路分析""將差異代謝物進(jìn)行KEGG通路富集,結(jié)果顯示(圖5),CK"vs"G1中鑒定出的30種顯著差異代謝物主要分布在8條代謝途徑中,差異代謝物富集最顯著的是類黃酮生物合成通路(flavonoid"biosynthesis),其次是紅色代表差異表達(dá)代謝物上調(diào),綠色代表差異表達(dá)代謝下調(diào)物。

黃酮和黃酮醇生物合成通路(flavone"and"flavonol"biosynthesis);G1"vs"G2中鑒定出的24種顯著差異代謝物主要分布在12條代謝途徑中,差異代謝物富集最顯著的是苯丙烷生物合成通路(pheny l propanoid"biosynthesis),其次是嘧啶代謝通路(pyrimidine"metabolism);G2"vs"G3中鑒定出來(lái)的25種顯著差異代謝物主要分布在9條代謝途徑中,差異代謝物富集最顯著的是賴氨酸降解通路(lysine"degradation),其次是嘧啶代謝通路;CK"vs"G2中鑒定出的68種顯著差異代謝物主要分布在20條代謝途徑中,差異代謝物富集最顯著的是苯丙烷生物合成通路,其次是甘油磷脂代謝通路(glycerophospholipid"metabolism);G1"vs"G3中鑒定出的52種顯著差異代謝物主要分布在20條代謝途徑中,差異代謝物富集最顯著的是苯丙烷生物合成通路,其次是嘧啶代謝通路;CK"vs"G3中鑒定出的82種差異代謝物,差異代謝物富集最顯著的是苯丙烷生物合成通路,其次是次級(jí)代謝產(chǎn)物的生物合成通路(Biosynthesis"of"secondary"metabolites)。

3""討論

黃酮類化合物是柑橘中重要的生物活性物質(zhì),不僅是柑橘植株重要的抗逆物質(zhì),也是柑橘果實(shí)發(fā)揮抗氧化、抗炎癥等食用和藥用價(jià)值的重要原因;對(duì)柑橘黃酮類物質(zhì)進(jìn)行組分鑒別和定量研究,有助于延長(zhǎng)柑橘產(chǎn)業(yè)鏈,為開發(fā)柑橘食藥產(chǎn)品建立基礎(chǔ)[24]。類黃酮是葡萄柚主要功能成分之一[25],具有抗氧化、抗炎、降低膽固醇、抗菌及抗癌等功效。葡萄柚具有較強(qiáng)的生物活性,雞尾葡萄柚所含類黃酮種類明顯多于普通柚類品種[26]。基于廣泛靶向代謝組學(xué)技術(shù)檢測(cè)到的桂葡柚1號(hào)黃酮多達(dá)159種,包括柚皮苷、枸橘苷、橙皮苷、新橙皮苷、蕓香柚皮苷、忍冬苷、木犀草苷、柚皮素、橙皮素、異槲皮苷、金絲桃苷等,具有很好的保健價(jià)值。檢測(cè)到氨基酸及其衍生物64種,包括賴氨酸、蛋氨酸、異亮氨酸、苯丙氨酸、色氨酸、亮氨酸、蘇氨酸、纈氨酸等8種人體必需氨基酸,和人體半必需氨基酸精氨酸,以及多種非必需氨基酸和氨基酸衍生物。氨基酸種類較齊全,營(yíng)養(yǎng)豐富,兼具食用和藥用價(jià)值,其中蛋氨酸、亮氨酸、異亮氨酸、苯丙氨酸、賴氨酸、精氨酸、天冬氨酸、谷氨酸是評(píng)價(jià)食品及中藥材品質(zhì)的重要指標(biāo)[27],天冬氨酸和谷氨酸是鮮味氨基酸,蘇氨酸、丙氨酸、脯氨酸和絲氨酸是甜味氨基酸,苯丙氨酸、酪氨酸和色氨酸是芳香族氨基酸[28]。此外,谷胱甘肽還原型能明顯改善原發(fā)性肝癌介入治療引起的肝功能損害,有很好的臨床應(yīng)用價(jià)值[29]。研究發(fā)現(xiàn)酚酸類化合物具有抗氧化、抗炎、抑菌、抗糖尿病、抗癌等多種生物活性,因此酚酸類化合物可以應(yīng)用于傳統(tǒng)藥物或作為膳食補(bǔ)充劑應(yīng)用于現(xiàn)代營(yíng)養(yǎng)制品中[30]。動(dòng)物和人自身不能合成酚酸,主要通過(guò)食物獲得,水果、蔬菜、豆類、谷物等都是很好的酚酸來(lái)源,此外果汁、茶、啤酒、咖啡等飲品中酚酸含量也很豐富[31]。桂葡柚1號(hào)中檢測(cè)到酚酸類化合物64種,包括有抗炎作用的阿魏酸、綠原酸、咖啡酸等,有抗氧化作用的咖啡酸、綠原酸、阿魏酸、芥子酸、原兒茶酸、香草酸、丁香酸等,有抑菌作用的原兒茶酸、香草酸、咖啡酸等,有對(duì)乳腺癌、肝癌、肺癌、血癌、宮頸癌等具有抗癌活性的綠原酸、咖啡酸、阿魏酸等[30]。由此可見(jiàn),桂葡柚1號(hào)代謝物功能成分多,可對(duì)其健康功效開展相關(guān)研究,并加以利用。

本研究中,桂葡柚1號(hào)果實(shí)不同成熟度果肉代謝物表達(dá)存在差異。隨著果實(shí)的成熟,果肉中上調(diào)差異代謝物和下調(diào)差異代謝物種類均呈上升趨勢(shì),到成熟后期,增速有所下降,但總體上,下調(diào)差異代謝物種類多于上調(diào)差異代謝物種類,且下調(diào)差異表達(dá)顯著的代謝物中,包含諸多功能成分代謝物。不同成熟階段的主要差異代謝物不盡相同,成熟初期為黃酮類、萜類、生物堿、木脂素,中期為酚酸類、香豆素、木脂素,后期黃酮類、脂質(zhì)、其他類、香豆素。隨著果實(shí)成熟度增加,果肉中下調(diào)差異表達(dá)顯著的氨基酸及其衍生物、脂質(zhì)種類增加,只有脯氨酸、二十碳二烯酸上調(diào),這與前人的研究結(jié)果基本相符。牟蛟琳等[32]對(duì)高班柚、代代酸橙、夏橙、稻葉溫州蜜柑、本地早橘、尤力克檸檬6個(gè)柑橘品種檢測(cè)發(fā)現(xiàn),氨基酸的總含量、脂類物質(zhì)含量均隨著果實(shí)的成熟而降低,有色層中脯氨酸的相對(duì)含量隨著果實(shí)的成熟而增加。董昕穎[33]研究發(fā)現(xiàn)尤力克檸檬果皮和果肉中17種氨基酸的總含量均隨著成熟度的增加而下降。同時(shí),隨著果實(shí)的成熟,果肉中酚酸類物質(zhì)下調(diào)差異表達(dá)顯著的種類增加,成熟中后期包括原兒茶酸、香草酸、咖啡酸、阿魏酸、新綠原酸*、隱綠原酸等,這與前人研究結(jié)果較一致。徐貴華等[34]對(duì)不同成熟期蜜桔中酚酸的研究表明,果肉中綠原酸、咖啡酸、阿魏酸、原兒茶酸、香草酸等酚酸含量隨成熟度提高而減少。前人通過(guò)對(duì)東風(fēng)早柚等品種的研究,發(fā)現(xiàn)同一品種、同一部位篩查出的酚酸種類數(shù)量無(wú)明顯變化,但柚果實(shí)不同成熟期的生物活性成分含量有差異,隨著果實(shí)成熟度的上升,測(cè)定的酚酸含量大多降低[35]。黃酮差異代謝物下調(diào)種類多于上調(diào),且先增加后減少,在成熟中期最多。大部分下調(diào)黃酮代謝物相對(duì)含量在成熟初期大幅下降,在成熟后期又有上升,其中異槲皮苷、繡線菊苷、金絲桃苷等僅在成熟初期至中期下調(diào)差異表達(dá)顯著,這與對(duì)四季柚、文旦(授粉和未授粉)和早香柚4種柚的研究結(jié)果相同,隨著果實(shí)成熟度的增加,果肉中的黃酮類物質(zhì)含量多數(shù)在下降,并且初期急劇下降[35]。檸檬苦素和諾米林酸在成熟后期下調(diào)差異顯著,這與有關(guān)文獻(xiàn)報(bào)道較符合。但俊峰[36]對(duì)不同生長(zhǎng)期柚果中功能性成分的分析顯示,多數(shù)情況下,檸檬苦素類物質(zhì)的含量是隨成熟度上升而下降。張耀海等[35]對(duì)柚果實(shí)不同成熟期生物活性成分開展了分析,結(jié)果表明檸檬苦素含量大多呈現(xiàn)下降趨勢(shì)。張念[37]開展了柚果實(shí)不同成熟期主要營(yíng)養(yǎng)功能成分的變化規(guī)律研究,發(fā)現(xiàn)東風(fēng)早柚、琯溪蜜柚、梁平柚、長(zhǎng)壽沙田柚、豐都紅心柚和龍安柚6種柚果類檸檬苦素的總含量均隨著成熟期的延長(zhǎng)呈現(xiàn)降低的趨勢(shì)。有機(jī)酸甲基馬來(lái)酸、莽草酸相對(duì)含量持續(xù)下降,琥珀酸相對(duì)含量持續(xù)上升。劉淑楨等[38]研究發(fā)現(xiàn),國(guó)慶1號(hào)溫州蜜柑果實(shí)隨著成熟度上升,多種有機(jī)酸呈現(xiàn)出不同的變化趨勢(shì),但多數(shù)有機(jī)酸含量逐漸降低。本研究還發(fā)現(xiàn)辛弗林、亞精胺、甜菜苷等代謝物的相對(duì)含量在果實(shí)成熟度上升時(shí)持續(xù)減少。

不同成熟階段,富集差異代謝物通路不同。果實(shí)成熟初期富集最顯著的為類黃酮生物合成通路,其次是黃酮和黃酮醇生物合成通路類,與此時(shí)期黃酮類差異代謝物大部分相對(duì)含量大幅下降,黃酮類生物合成降低有關(guān)。果實(shí)成熟中期富集最顯著的為苯丙烷生物合成通路,后期為賴氨酸降解通路。整個(gè)成熟期差異代謝物富集最顯著的是苯丙烷生物合成通路。黃酮類化合物是來(lái)源于植物的一類重要的次生代謝產(chǎn)物,"具有抗癌、抗氧化、抗炎、降低血管脆性等多種藥理作用[39]。苯丙烷代謝作為植物重要的次級(jí)代謝途徑之一,在調(diào)控植物適應(yīng)性生長(zhǎng)的過(guò)程中發(fā)揮著重要功能,還與眾多藥用活性成分的合成息息相關(guān)[40]。因此,隨著果實(shí)成熟度上升,果肉中諸多生物活性物質(zhì)含量下降。

根據(jù)對(duì)桂葡柚1號(hào)生長(zhǎng)發(fā)育習(xí)性的觀測(cè),其果汁含量在7—8月份急劇增加,之后增速緩慢,10月底后不再增加,其果實(shí)口感一般在9月底(CK)已較好,隨著果實(shí)逐漸成熟,可溶性固形物增加,固酸比提高,口感變好,12月上旬(G3)果實(shí)開始出現(xiàn)可溶性固形物開始下降、浮皮等現(xiàn)象。因此,應(yīng)根據(jù)用途確定桂葡柚1號(hào)果實(shí)采摘成熟度。

4""結(jié)論

桂葡柚1號(hào)果肉代謝物種類多,營(yíng)養(yǎng)和功能成分豐富,生物活性較強(qiáng),具有很好的食用和保健價(jià)值,本研究為其營(yíng)養(yǎng)和健康功效研究奠定基礎(chǔ)。隨著果實(shí)的成熟,果肉代謝物種類、含量及果實(shí)品質(zhì)均在發(fā)生變化。在廣西南部地區(qū),桂葡柚1號(hào)果實(shí)從9月底進(jìn)入成熟期,在10月下旬至12上旬口感均佳,適宜鮮食,但至10月下旬,果肉中少量黃酮等功能成分下調(diào)差異顯著,至11月中旬,下調(diào)差異顯著的黃酮、酚酸、氨基酸及其衍生物、脂質(zhì)等功能成分物質(zhì)種類大量增加,用于保健或藥用的果應(yīng)根據(jù)功效需求提前采摘。

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