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33份火龍果種質(zhì)果實(shí)性狀主成分分析及綜合評價(jià)

2024-12-31 00:00:00張亞琦何云李洪立洪青梅濮文輝李瓊胡文斌劉平武
熱帶作物學(xué)報(bào) 2024年8期
關(guān)鍵詞:縱徑糖酸橫徑

摘""要:為了解不同火龍果果實(shí)品質(zhì),篩選品質(zhì)優(yōu)良的種質(zhì)資源。本研究以33份火龍果種質(zhì)資源為材料,對單果重、果實(shí)縱橫徑、蛋白質(zhì)、總黃酮、甜菜色素等15個(gè)植物學(xué)特征及品質(zhì)特性進(jìn)行測定,利用相關(guān)性分析和主成分分析法對果實(shí)品質(zhì)進(jìn)行綜合評價(jià)。結(jié)果表明:33份火龍果種質(zhì)資源的單果重為164.67~556.00"g,果實(shí)橫徑為5.86~9.40"cm,果實(shí)縱徑為7.29~11.94"cm,果形指數(shù)為0.99~1.39,總糖含量為78.80~126.05"mg/g,總酚含量為0.64~2.46"mg/g,總黃酮的含量為0.85~9.67"mg/g,硬度為6.62~16.86"N,蛋白質(zhì)的含量為0.29~1.45"mg/g,甜菜色素的含量為0.69~37.01"mg/100"g,淀粉的含量為14.12~44.60"mg/g,總酸含量為0.33~15.23"mg/100"g。采用Pearson法對其主要植物學(xué)特征及品質(zhì)特性進(jìn)行相關(guān)性分析??偹崤c可溶性固形物呈極顯著正相關(guān),相關(guān)系數(shù)為0.478,與糖酸比呈極顯著負(fù)相關(guān),相關(guān)系數(shù)為?0.532??v徑、橫徑與單果重呈極顯著正相關(guān),相關(guān)系數(shù)分別為0.749、0.942??v徑與果形指數(shù)呈顯著正相關(guān),相關(guān)系數(shù)為0.426。重量與糖酸比、硬度均呈顯著正相關(guān),相關(guān)系數(shù)分別0.360、0.351。經(jīng)主成分分析將15個(gè)性狀綜合成7個(gè)主成分因子,累積貢獻(xiàn)率為82.55%,第一主成分貢獻(xiàn)率為22.45%,以單果重、果實(shí)縱橫徑、糖酸比貢獻(xiàn)較大。第二主成分貢獻(xiàn)率為13.87%,以總糖含量、可溶性固形物含量、淀粉含量貢獻(xiàn)較大。第三主成分貢獻(xiàn)率為12.28%。其中糖酸組成、單果重、果實(shí)橫徑、果實(shí)縱徑、可溶性固形物含量、淀粉含量、氨基酸含量等是評價(jià)火龍果果實(shí)綜合品質(zhì)的關(guān)鍵性指標(biāo)。經(jīng)綜合評價(jià)篩選6個(gè)綜合得分較高的火龍果種質(zhì),即熱研1號、菀華粉紅、紅寶龍、無刺紅、臨家紅韻和紅金寶可作為火龍果品質(zhì)育種的優(yōu)質(zhì)親本。

關(guān)鍵詞:火龍果;果實(shí)品質(zhì);主成分分析;綜合評價(jià)中圖分類號:S667.9""""""文獻(xiàn)標(biāo)志碼:A

Principal"Component"Analysis"and"Comprehensive"Evaluation"of"Fruit"Traits"of"33"Pitaya"Germplasms

ZHANG"Yaqi1,2,3,4,5,"HE"Yun3,4,5,"LI"Hongli3,4,5,"HONG"Qingmei3,4,5,"PU"Wenhui3,4,5,"LI"Qiong3,4,5*,"HU"Wenbin3,4,5*,"LIU"Pingwu1,2*

1."College"of"Tropical"Crops,"Hainan"University,"Haikou,"Hainan"570228,"China;"2."School"of"Breeding"and"Multiplication,"Hainan"University,"Sanya,"Hainan"572025,"China;"3."Tropical"Crop"Genetic"Resources"Institute,"Chinese"Academy"of"Tropical"Agricultural"Sciences,"Haikou,"Hainan"571101,"China;"4."Key"Laboratory"of"Crop"Gene"Resources"and"Germplasm"Enhancement"in"Southern"China,"Ministry"of"Agriculture"and"Rural"Affairs,"Haikou,"Hainan"571101,"China;"5."Key"Laboratory"of"Tropical"Crops"Germplasm"Resources"Genetic"Improvement"and"Innovation"of"Hainan"Province,"Haikou,"Hainan"571101,"China

Abstract:"In"order"to"understand"the"fruit"quality"of"different"varieties"of"pitaya"and"to"screen"the"germplasm"resources"with"good"quality,"33"pitaya"germplasm"resources"were"and"15"botanical"traits"and"quality"properties"such"as"single"fruit"weight,"fruit"transverse"and"longitudinal"diameters,"proteins,"total"flavonoids,"and"beet"pigments"were"measured,"and"fruit"quality"was"comprehensively"evaluated"by"using"correlation"analysis"and"principal"component"analysis."The"33"pitaya"germplasm"resources"had"a"single"fruit"mass"of"164.67?556.00"g,"a"transverse"fruit"diameter"of"5.86?9.40"cm,"a"longitudinal"fruit"diameter"of"7.29?11.94"cm,"a"fruit"shape"index"of"0.99?1.39,"a"total"sugar"content"of"78.80?"126.05"mg/g,"a"total"phenolic"content"of"0.64?2.46"mg/g,"a"total"flavonoid"content"of"0.85?9.67"mg/g,"hardness"of"6.62?"16.86"N,"protein"content"of"0.29?1.45"mg/g,"beet"pigment"content"of"0.69?37.01"mg/100"g,"and"starch"content"of"14.12?44.60"mg/g."The"total"acid"content"ranged"from"0.33"to"15.23"mg/100"g."The"Pearson’s"method"was"used"to"correlate"the"main"botanical"and"quality"traits"of"the"pitaya"germplasm"resources."and"quality"traits"were"correlated."The"correlation"coefficients"were"0.478"for"total"acid"and"soluble"solids,"and"?0.532"for"sugar-acid"ratio,"while"the"correlation"coefficients"were"0.749"and"0.942"for"longitudinal"and"transverse"diameters."The"correlation"coefficient"between"longitudinal"diameter"and"fruit"shape"index"was"0.426,"and"the"correlation"coefficient"between"weight"and"sugar-acid"ratio"and"hardness"was"0.360"and"0.351,"respectively."After"principal"component"analysis,"the"15"traits"were"combined"into"7"principal"component"factors,"with"a"cumulative"contribution"of"82.55%."The"first"principal"component"contributed"22.45%,"with"single"fruit"weight,"fruit"longitudinal"and"transverse"diameter,"and"sugar-acid"ratio"contributing"more."The"second"principal"component"contributed"13.87%,"with"total"sugar"content,"soluble"solids"content"and"starch"content"contributing"more."The"contribution"of"the"third"principal"component"was"12.28%,"with"soluble"solids"content"contributing"more."Among"them,"sugar-acid"composition,"single"fruit"weight,"fruit"transverse"diameter,"fruit"longitudinal"diameter,"soluble"solids"content,"starch"content,"amino"acid"content,"etc."are"the"key"indexes"for"evaluating"the"comprehensive"quality"of"dragon"fruit."After"comprehensive"evaluation,"six"excellent"pitaya"singles"with"high"comprehensive"scores"were"screened,"i.e.,"Reyan"1"hao,"Wanhuafenhong,"Hongbaolong,"Wucihong,"Linjiahongyun"and"Hongjinbao,"which"can"be"used"as"high-quality"parents"for"pitaya"quality"breeding.

Keywords:"pitaya;"fruit"quality;"principal"component"analysis;"comprehensive"evaluation

DOI:"10.3969/j.issn.1000-2561.2024.08.005

火龍果(Hylocereus"undulatus"Britt),屬仙人掌科(Cactaceae)多年生攀援植物,起源于拉丁美洲和西印度群島等熱帶亞熱帶沙漠地區(qū),是典型的熱帶果樹。目前人工栽培遍及中美洲、越南、泰國、中國及美國南部等地。在我國主要種植于海南、廣西、廣東、云南、貴州、福建等地,是一種極具市場潛力的熱帶水果[1-2]?;瘕埞托路f獨(dú)特,色澤艷麗,口感細(xì)膩,富含人體所需的多種營養(yǎng)物質(zhì)。作為近幾年新興的水果,火龍果的種植面積不斷擴(kuò)大,并出現(xiàn)多個(gè)一定規(guī)模的種植企業(yè),給企業(yè)帶來了較好的經(jīng)濟(jì)價(jià)值。火龍果作為一種經(jīng)濟(jì)價(jià)值與營養(yǎng)價(jià)值都較高的果樹,其研究和開發(fā)利用越來越被重視,篩選優(yōu)良品種對生產(chǎn)優(yōu)質(zhì)火龍果及其產(chǎn)業(yè)健康發(fā)展具有重要意義。

果實(shí)品質(zhì)分析是幫助判斷果實(shí)好壞的關(guān)鍵,果實(shí)外觀品質(zhì)主要包括單果重和果形指數(shù)、果皮色澤等,內(nèi)在品質(zhì)主要包括硬度、糖酸等風(fēng)味物質(zhì)及其他營養(yǎng)物質(zhì)。鄧愛妮等[3]測定海南地區(qū)栽培的紅肉和白肉火龍果中營養(yǎng)成分含量,為消費(fèi)者、種植戶、加工企業(yè)提供參考依據(jù)。王飛躍等[4]對石漠化治理區(qū)火龍果果實(shí)品質(zhì)進(jìn)行評價(jià),為建立火龍果品質(zhì)評價(jià)指標(biāo)體系提供理論依據(jù)。陳心源等[5]通過研究發(fā)現(xiàn),中等大小的紅心火龍果風(fēng)味品質(zhì)最佳,且果實(shí)果心部位的風(fēng)味品質(zhì)最好。卓福昌等[6]通過相關(guān)性分析和變異系數(shù)法對27份火龍果種質(zhì)資源果實(shí)性狀進(jìn)行評價(jià),有效解決其種質(zhì)資源評價(jià)過程中存在的主觀性過強(qiáng)、不充分、不全面等問題。郭靜等[7]采用主成分分析法篩選京白梨優(yōu)質(zhì)果實(shí)的評價(jià)指標(biāo),并為果實(shí)采收和分級提供標(biāo)準(zhǔn)。代濤等[8]進(jìn)行主成分分析和系統(tǒng)聚類分析,構(gòu)建綜合評價(jià)模型,為芒果種質(zhì)資源利用與糖酸品質(zhì)評價(jià)提供參考依據(jù)。以上研究均為火龍果品質(zhì)評價(jià)提供科學(xué)參考。

本研究以33份火龍果種質(zhì)資源為研究對象,以可溶性固形物含量、蛋白質(zhì)含量、總酚含量、氨基酸含量等15項(xiàng)指標(biāo)為供試數(shù)據(jù),應(yīng)用相關(guān)性分析、主成分分析等多種分析方法,明確各指標(biāo)間的相互關(guān)系,分析各供試資源果實(shí)品質(zhì)特性,構(gòu)建綜合評價(jià)模型,對供試資源果實(shí)品質(zhì)進(jìn)行綜合評價(jià),篩選優(yōu)異火龍果種質(zhì)資源,以期為火龍果資源利用與新品種選育提供參考。

1""材料與方法

1.1""材料

供試材料采自中國熱帶農(nóng)業(yè)科學(xué)院熱帶作物品種資源研究所儋州省級火龍果種質(zhì)資源圃

(19°54′37.21″N,110°73′37.32″E)。供試材料為長勢良好的3~5年生火龍果植株的果實(shí),全年可正常開花結(jié)果。種植株行距為0.5"m×3"m,各種質(zhì)管理水平一致。供試火龍果種質(zhì)采集信息如表1所示。

1.2""方法

選取15個(gè)性狀指標(biāo)進(jìn)行果實(shí)測定,每個(gè)種質(zhì)隨機(jī)選取5株果樹,在同一產(chǎn)果批次果實(shí)成熟時(shí)進(jìn)行采樣,采摘同批次全部果實(shí),之后隨機(jī)選取5個(gè)樣品果,切塊液氮速凍。用高速萬能粉碎機(jī)將33份火龍果種質(zhì)的果肉打磨成粉,保存于50"mL離心管中,置于?80"℃超低溫冰箱待用;進(jìn)行測定,每次測定重復(fù)3次。

指標(biāo)測定方法如下:(1)單果重、果皮重測定。采用萬分之一天平進(jìn)行測定;(2)可食率測定??墒陈?(單果重-果皮重)/單果重×"100%;(3)果實(shí)大小測定。果實(shí)縱徑、果實(shí)橫徑采用數(shù)顯游標(biāo)卡尺(精確度0.01"mm)進(jìn)行測定;(4)果形指數(shù)測定。果形指數(shù)=果實(shí)縱徑/果實(shí)橫徑;(5)果實(shí)可溶性固形物含量測定??扇苄怨绦挝锖坎捎脭?shù)顯糖度計(jì)(LH-B55)進(jìn)行測定;(6)硬度測定。參考NY/T"2009—2011《水果硬度的測定》,采用硬度計(jì)(愛德堡GY-4)進(jìn)行測定;(7)可溶性蛋白含量測定。采用考馬斯亮藍(lán)G-250法[9];(8)總酚含量測定。參考JUNG等[10]的方法,用Folin-Ciocalteu試劑測定總酚含量;(9)甜菜色素含量測定。參照周俊良等[11]的方法,利用紫外分光光度計(jì)測量標(biāo)準(zhǔn)品溶液在波長535"nm下的吸光度繪制標(biāo)準(zhǔn)曲線,測定各個(gè)樣品的甜菜色素總含量;(10)總黃酮含量測定。參考游新俠等[12]的方法,用亞硝酸鈉-硝酸鋁比色法測定總黃酮的含量;(11)總氨基酸含量測定。參照劉長姣等[13]的方法,用茚三酮比色法測定氨基酸含量;(12)淀粉含量測定。參照文赤夫等[14]的方法,利用蒽酮比色法測定葡萄糖含量,計(jì)算淀粉含量;(13)總酸含量測定。采用GB"12456—2021《食品中總酸的測定》第二法pH計(jì)電位滴定法測定;(14)還原糖含量測定。采用NY/T2742—2015《水果及制品可溶性糖的測定3,5-二硝基水楊酸比色法》測定。

1.3""數(shù)據(jù)處理

數(shù)據(jù)采用Excel"2010及SPASS"21.0軟件進(jìn)行數(shù)據(jù)主成分分析、相關(guān)性分析、方差分析等。

2""結(jié)果與分析

2.1""果實(shí)植物學(xué)性狀評價(jià)

33份火龍果種質(zhì)資源的單果重為164.67~"556.00"g,平均為357.38"g,其中熱研1號的單果重最大,無刺紅龍、玉龍一號的單果重次之;紅水晶和粉水晶的單果重較小。單果縱徑為7.29~"11.94"cm,果實(shí)平均縱徑為9.80"cm;其中無刺黃龍的縱徑最大,無刺紅、玉龍一號的縱徑次之。粉紅龍和粉水晶的果實(shí)單果縱徑較小,最小為粉水晶。單果橫徑為5.86~9.40"cm,果實(shí)平均縱徑為7.99"cm。其中熱研1號的橫徑最大,菀華粉紅的橫徑次之。粉水晶橫徑為最小。果形指數(shù)為0.99~1.39"cm,果實(shí)平均縱徑為1.23"cm;其中蜜寶的果形指數(shù)最大,紅冠的果形指數(shù)最?。ū?)。

2.2""果實(shí)營養(yǎng)品質(zhì)評價(jià)

33份火龍果種質(zhì)資源營養(yǎng)品質(zhì)比較見表3,33份火龍果種質(zhì)資源中的蛋白質(zhì)含量為0.29~1.45"mg/g,平均含量為0.93"mg/g。其中紅冠、菀華白、雙色1號火龍果的蛋白質(zhì)含量較少。紅繡球、燕窩果的蛋白質(zhì)含量均顯著高于其余種質(zhì),紅繡球含量最高,約為雙色1號的5倍。甜菜色素含量為0.69~37.01"mg/100"g,平均含量為10.65"mg/100"g。其中白蜜龍、石火泉、無刺黃龍的甜菜色素含量較少。淀粉含量為14.12~"44.60"mg/g,平均含量為24.46"mg/g;其中無刺紅龍、紅繡球、軟枝大紅的淀粉含量較少。紅水晶、黃錦的淀粉含量較高,最高為紅水晶,約為無刺紅龍的3倍。氨基酸含量為0.22~1.15"mg/g,平均含量為0.54"mg/g;其中軟枝大紅、玉龍一號、桂紅龍、燕窩果的氨基酸含量較少。無刺紅、白蜜龍的氨基酸含量較高,最高為無刺紅??偺呛繛?8.80~126.05"mg/g,平均含量為103.94"mg/g;其中粵紅、紅繡球總糖含量較低。白蜜龍、臨家紅韻中的總糖含量較高;可滴定酸的含量為0.33~"15.23"mg/100"g,平均酸度為1.61"mg/100"g;其中無刺紅龍、紅冠、版納雙色、富貴紅酸度較低。紅寶龍、粉紅龍的酸度較高。糖酸比為0.72~38.72??扇苄怨绦挝锖繛?4.07%~22.37%,平均含量為17.73%;其中玉龍1號、版納雙色的可溶性固形物含量較少;紅寶龍、熱研1號、紫龍的可溶性固形物含量較高??偡雍繛?.64~2.46"mg/g,平均值為1.35"mg/g;其中臨家紅韻、版納雙色、玉龍1號的總酚含量較低。紅金寶、無刺紅、粉紅龍的總酚含量較高。硬度為6.62~16.86"N,平均值為10.71"N;其中白蜜龍、無刺黃龍的果肉較疏松硬度較低。菀華粉紅、無刺紅龍的硬度均顯著高于其余種質(zhì)??傸S酮的含量為0.85~9.67"mg/g,平均總黃酮含量為3.58"mg/g;其中,臨家紅韻、熱研1號黃酮含量較低,菀華白、玉馨香的黃酮含量較高。

2.3""不同品種火龍果果實(shí)性狀相關(guān)性分析

采用Pearson法對33份火龍果種質(zhì)資源的主要植物學(xué)特征及品質(zhì)特性進(jìn)行相關(guān)性分析(表4)??偺呛颗c蛋白質(zhì)含量呈顯著負(fù)相關(guān)(Plt;0.05),相關(guān)系數(shù)為?4.03??偺呛颗c淀粉含量呈顯著正相關(guān),相關(guān)系數(shù)為0.367??偹崤c可溶性固形物含量呈極顯著正相關(guān)(Plt;0.01),相關(guān)系數(shù)為0.478;與糖酸比呈極顯著負(fù)相關(guān),相關(guān)系數(shù)為?0.532。單果重與縱徑、橫徑均呈極顯著正相關(guān),相關(guān)系數(shù)為0.749、0.942。果形指數(shù)與果實(shí)縱徑呈顯著正相關(guān),相關(guān)系數(shù)為0.426,果實(shí)縱徑與果實(shí)橫徑呈極顯著正相關(guān),相關(guān)系數(shù)為0.644。單果重與糖酸比、硬度均呈顯著正相關(guān),相關(guān)系數(shù)分別0.360、0.351。硬度與橫徑呈顯著正相關(guān),相關(guān)系數(shù)為0.420?;瘕埞N質(zhì)資源植物學(xué)特征及品質(zhì)特性間有明顯的相關(guān)性且相互影響。

2.4""不同品種火龍果果實(shí)性狀主成分分析

對33份火龍果種質(zhì)資源果實(shí)的15個(gè)指標(biāo)進(jìn)行主成分分析,結(jié)果如表5、表6所示。以特征值gt;1.0為標(biāo)準(zhǔn),提取到7個(gè)主成分,累計(jì)方差貢獻(xiàn)率達(dá)82.55%,即這7個(gè)成分可以代表大部分篩選信息。第1主成分的特征值為3.37,其方差貢獻(xiàn)率最高,為22.46%,其主要決定因子分別為單果重、果實(shí)橫徑、果實(shí)縱徑、糖酸比,第2主成分的特征值為2.08,其方差貢獻(xiàn)率為13.87%,其主要決定因子分別為總糖、淀粉含量。第3主成分的特征值為1.84,其方差貢獻(xiàn)率為12.28%,其主要決定因子為果實(shí)中可溶性固形物的含量,即果實(shí)風(fēng)味。

根據(jù)初始因子載荷矩陣和各個(gè)主成分的特征值計(jì)算得到的不同種質(zhì)資源各指標(biāo)的特征向量。用X1表示單果重,X2表示果實(shí)橫徑、X3表示果實(shí)縱徑、X4表示總糖含量,X5表示可溶性固形物含量,X6表示淀粉含量、X7表示可溶性酸含量、X8表示糖酸比、X9表示果形指數(shù)、X10表示黃酮含量、X11表示硬度、X12表示總酚含量,X13表示蛋白質(zhì)含量、X14表示氨基酸含量、X15表示甜菜色素含量。

以F1、F2、F3、F4、F5、F6、F7表示不同種質(zhì)資源果實(shí)品質(zhì)分別在第1、第2、第3、第4、第5、第6、第7個(gè)主成分中的得分,以特征向量為權(quán)重,得到的7個(gè)主成分的函數(shù)表達(dá)式如下:

F1=0.139X1+0.133X2+0.118X3+0.028X4?""""""0.020X5?0.046X6?0.045X7+0.076X8?0.010X9?0.045X10+

0.056X11?0.005X12?0.020X13+0.053X14+0.06X15

F2=0.007X1+0.012X2?0.025X3+0.088X4+0.065X5+"""""0.061X6+0.043X7+0.016X8?0.048X9?0.046X10?

0.019X11?0.051X12?0.043X13+0.017X14?0.014X15

F3=0.021X1+0.029X2?0.002X3?0.036X4+0.057X5?

0.039X6+0.080X7?0.058X8?0.034X9+0.005X10+0.047X11?

0.007X12+0.039X13?0.016X14+0.012X15

F4=?0.002X1+0.006X2?0.034X3?0.009X4?0.017X5?0.007X6+0.007X7+0.008X8?0.060X9?0.057X10?0.003X11+0.031X12?0.029X13+0.046X14+0.043X15

F5=?0.008X1?0.004X2+0.009X3+0.022X4+0.026X5+0.013X6?0.020X7?0.035X8+0.020X9?0.002X10+0.053X11+

0.053X12?0.044X13?0.001X14?0.007X15

F6=0.005X1?0.009X2+0.030X3+0.012X4?0.007X5?

0.024X6+0.033X7?0.035X8+0.034X9+0.017X10?0.034X11?

0.010X12?0.023X13+0.054X14?0.014X15

F7=?0.012X1?0.015X2+0.008X3+0.020X4+0.028X5?0.001X6+0.002X7+0.015X8+0.032X9+0.024X10+0.002X11?0.014X12+0.010X13?0.008X14+0.058X15

根據(jù)表6各個(gè)主成分每個(gè)指標(biāo)的特征向量值,確定主成分在各線性組合中的系數(shù),得到7個(gè)主成分得分線性方程,再根據(jù)方差貢獻(xiàn)率得到各指標(biāo)在綜合得分模型中的系數(shù),綜合方程如下:

Y=0.150X1+0.152X2+0.104X3+0.124X4+0.132X5?

0.029X6+0.01X7?0.012X8?0.066X9+0.015X10+0.103X11?

0.003X12?0.110X13+0.145X14+0.138X15。

將各指標(biāo)在綜合方程中的系數(shù)進(jìn)行歸一化處理,得到方程如下:

F=0.1593X1+0.1616X2+0.1102X3+0.1316X4+

0.1399X5?0.0306X6+0.1064X7?0.0130X8?0.0703X9+

0.0158X10+0.0192X11?0.0028X12?0.1173X13+0.1537X14+

0.1464X15。

根據(jù)各指標(biāo)測定值,得出每份種質(zhì)材料的綜合得分F值(表7)。結(jié)果表明,熱研1號綜合得分最高,F(xiàn)值為1.53,表明其綜合品質(zhì)較好,而粉水晶綜合得分最低,F(xiàn)值為?1.34,表明其綜合品質(zhì)較差。

3""討論

通過測定結(jié)果可以看出,各品質(zhì)指標(biāo)間具有明顯的相關(guān)性且相互影響。采用Pearson法進(jìn)行相關(guān)性分析結(jié)果表明??偺呛颗c蛋白質(zhì)顯著負(fù)相關(guān),相關(guān)系數(shù)為?0.403;與淀粉含量呈顯著正相關(guān),相關(guān)系數(shù)為0.367??偺呛吭礁撸鞍踪|(zhì)含量越低,淀粉含量越高。總酸與可溶性固形物呈極顯著正相關(guān),相關(guān)系數(shù)為0.478;與糖酸比呈極顯著負(fù)相關(guān),相關(guān)系數(shù)為?0.532。總酸越高,糖酸比越低,可溶性固形物含量越高。單果重與縱徑、橫徑均呈極顯著正相關(guān),相關(guān)系數(shù)為0.749、0.942。果形指數(shù)與果實(shí)縱徑呈顯著正相關(guān),相關(guān)系數(shù)為0.426??v徑與橫徑呈極顯著正相關(guān),相關(guān)系數(shù)為0.644。當(dāng)火龍果縱、橫徑越大時(shí),果就越大,單果重也會隨之增加。單果重與糖酸比、硬度均呈顯著正相關(guān),相關(guān)系數(shù)分別為0.360、0.351。單果重越重,糖酸比的比值、果實(shí)的硬度也越大。單果重與橫徑呈極顯著正相關(guān),相關(guān)系數(shù)為0.942。硬度與橫徑呈顯著正相關(guān),相關(guān)系數(shù)為0.420。果實(shí)硬度越大,橫徑就越大。

目前,多位學(xué)者運(yùn)用多元統(tǒng)計(jì)分析對果實(shí)品質(zhì)進(jìn)行評價(jià),梁鈺梅等[15]基于主成分分析法對9個(gè)品種藍(lán)莓進(jìn)行了品質(zhì)評價(jià),溫錦麗等[16]基于主成分分析對軟棗獼猴桃果實(shí)進(jìn)行了品質(zhì)評價(jià),張東為等[17]基于主成分分析對沙棘果實(shí)進(jìn)行了品質(zhì)評價(jià)。運(yùn)用主成分分析篩選優(yōu)株能夠簡化程序,避免性狀相關(guān)性的影響以及出現(xiàn)大量信息重疊。本研究通過主成分分析法對33份火龍果種質(zhì)資源中植物學(xué)特征及品質(zhì)特性等15項(xiàng)指標(biāo)進(jìn)行分析評價(jià)。將15個(gè)指標(biāo)綜合為7個(gè)主成分,其累計(jì)方差貢獻(xiàn)率為82.55%,綜合了火龍果品質(zhì)的大部分相關(guān)信息,對火龍果品質(zhì)評價(jià)指標(biāo)進(jìn)行降維,最終得到以單果重、果實(shí)橫徑、果實(shí)縱徑、總糖含量、可滴定酸含量、可溶性固形物含量、淀粉含量作為評價(jià)火龍果品質(zhì)的主要指標(biāo)。有研究表明,果實(shí)的品質(zhì)主要取決于體現(xiàn)風(fēng)味與營養(yǎng)成分的指標(biāo)[18-19]。卓福昌等[6]通過相關(guān)性分析和變異系數(shù)法對27份火龍果種質(zhì)資源進(jìn)行性狀的評價(jià),發(fā)現(xiàn)縱徑、橫徑與單重量呈極顯著正相關(guān)。周笑犁等[20]通過研究紅肉與白肉火龍果營養(yǎng)成分,發(fā)現(xiàn)火龍果的含糖量較高,而含酸量較低。這與本研究分析的結(jié)果一致。33份火龍果蛋白質(zhì)含量均值為0.93"mg/g,比其他大部分水果蛋白質(zhì)含量高[21-25]。可溶性固形物含量作為評價(jià)果品品質(zhì)的重要指標(biāo)之一,在蘋果、梨、草莓、芒果、荔枝、葡萄等眾多果品中均占有重要地位。通過對火龍果可溶性固形物含量的測定與分析,可以更全面地了解火龍果的特性,為深入探究火龍果的營養(yǎng)價(jià)值及品質(zhì)評價(jià)提供了有益的啟示[26-27]。經(jīng)綜合評價(jià)篩選出6個(gè)綜合得分高的火龍果種質(zhì)資源,即熱研1號、菀華粉紅、紅寶龍、無刺紅、臨家紅韻、紅金寶可作為火龍果品質(zhì)育種的優(yōu)質(zhì)親本。該研究對促進(jìn)火龍果品質(zhì)提升具有重要指導(dǎo)意義。

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[7]"郭靜,"伏芳,"高同雨,"姜峰,"李天忠,"朱元娣."‘京白梨’優(yōu)質(zhì)果實(shí)的評價(jià)指標(biāo)分析[J]."中國農(nóng)業(yè)大學(xué)學(xué)報(bào),"2022,"27(1):"79-95.GUO"J,"FU"F,"GAO"T"Y,"JIANG"F,"LI"T"Z,"ZHU"Y"D."Analysis"on"evaluation"index"of"high"quality"pyrus"ussuriensis"‘Jing"Bai"LI’"fruits[J]."Journal"of"China"Agricultural"University,"2022,"27(1):"79-95."(in"Chinese)

[8]"代濤,"萬嘉欣,"黎潔華,"駱國亮,"李麗,"武紅霞,"許文天,"鄭斌,"王松標(biāo),"羅聰,"梁清志."基于主成分與聚類分析綜合評價(jià)杧果種質(zhì)資源果實(shí)糖酸品質(zhì)[J]."果樹學(xué)報(bào),"2022,"39(12):"2253-2263.DAI"T,"WAN"J"X,"LI"J"H,"LUO"G"L,"LI"L,"WU"H"X,"XU"W"T,"ZHENG"B,"WANG"S"B,"LUO"C,"LIANG"Q"Z."Comprehensive"evaluation"of"fruit"sugar"and"acid"quality"of"mango"germplasm"based"on"principal"component"and"cluster"analysis[J]."Journal"of"Fruit"Science,"2022,"39(12):"2253-2263."(in"Chinese)

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[12]"游新俠,"仇農(nóng)學(xué)."超聲波輔助提取荊芥葉總黃酮的方法研究[J]."西北農(nóng)業(yè)學(xué)報(bào),"2006(1):"152-155.YOU"X"X,"QIU"N"X."Study"on"extraction"of"total"flavone"from"fineleaf"schizonepeta"herb"by"ultrasonic"wave[J]."Acta"Agriculturae"Boreali-occidentalis"Sinica,"2006(1):"152-155."(in"Chinese)

[13]"劉長姣,"楊越越,"王妮,"余平."茚三酮比色法測定秋葵中氨基酸含量條件的優(yōu)化[J]."中國食品添加劑,"2018(1):"187-193.LIU"C"J,"YANG"Y"Y,"WANG"N,"YU"P."Optimization"of"detection"conditions"of"amino"acids"in"okra"by"ninhydrin"colorimetric"method[J]."China"Food"Additives,"2018(1):"187-193."(in"Chinese)

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[15]"梁鈺梅,"李可,"林籽汐,"李曉梅,"周勁松,"廖茂雯,"林昊然,"朱永清,"李華佳,"劉剛."基于主成分分析法的9個(gè)品種藍(lán)莓品質(zhì)評價(jià)[J]."食品工業(yè)科技,"2024(9):"235-244.LIANG"Y"M,"LI"K,"LIN"Z"X,"LI"X"M,"ZHOU"J"S,"LIAO"M"W,"LIN"H"R,"ZHU"Y"Q,"LI"H"J,"LIU"G."Quality"evaluation"of"nine"varieties"of"blueberry"based"on"principal"component"analysis[J]."Science"and"Technology"of"Food"Industry,"2024(9):"235-244."(in"Chinese)

[16]"溫錦麗,"曹煒玉,"王月,"何艷麗,"孫怡寧,"原鵬強(qiáng),"孫博位,"路文鵬."基于主成分分析與聚類分析的軟棗獼猴桃果實(shí)品質(zhì)綜合評價(jià)[J]."食品工業(yè)科技,"2024(1):"247-257.WEN"J"L,"CAO"W"Y,"WANG"Y,"HE"Y"L,"SUN"Y"N,"YUAN"P"Q,"SUN"B"W,"LU"W"P."Comprehensive"evaluation"of"fruit"quality"of"actinidia"arguta"based"on"principal"component"analysis"and"cluster"analysis[J]."Science"and"Technology"of"Food"Industry,"2024(1):"247-257."(in"Chinese)

[17]"張東為,"趙鑫丹,"戈素芬,"阮成江,"張海旺."沙棘果實(shí)品質(zhì)的主成分分析及綜合評價(jià)[J]."經(jīng)濟(jì)林研究,"2023,"41(2):"1-10.ZHANG"D"W,"ZHAO"X"D,"GE"S"F,"RUAN"C"J,"ZHANG"H"W."Principal"component"analysis"and"comprehensive"evaluation"of"sea"buckthorn"berry"quality[J]."Non-wood"Forest"Research,"2023,"41(2):"1-10."(in"Chinese)

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[19]"聶繼云,"毋永龍,"李海飛,"王昆,"徐國鋒,"閆震,"吳錫."蘋果鮮榨汁品質(zhì)評價(jià)體系構(gòu)建[J]."中國農(nóng)業(yè)科學(xué),"2013,"46(8):"1657-1667.NIE"J"Y,"WU"Y"L,"LI"H"F,"WANG"K,"XU"G"F,"YAN"Z,"WU"X."Evaluation"system"established"for"fresh"apple"juice"quality[J]."Scientia"Agricultura"Sinica,"2013,"46(8):"1657-1667."(in"Chinese)

[20]"周笑犁,"莫瑞,"肖娜,"杜斌,"林棟,"雷婭."紅肉與白肉火龍果常規(guī)營養(yǎng)成分及抗氧化活性比較分析[J]."食品工業(yè)科技,"2018,"39(21):"248-251,"319.ZHOU"X"L,"MO"R,"XIAO"N,"DU"B,"LIN"D,"LEI"Y."Comparative"analysis"of"nutritional"components"and"antioxidant"activity"in"red"pitaya"and"white"pitaya[J]."Science"and"Technology"of"Food"Industry,"2018,"39(21):"248-251,"319."(in"Chinese)

[21]"姜璐,"包怡紅,"賈雨彤,"賴章飛,"徐福成."18個(gè)品種藍(lán)靛果營養(yǎng)成分分析及綜合品質(zhì)評價(jià)[J]."農(nóng)業(yè)工程學(xué)報(bào),"2022,"38(7):"326-335.JIANG"L,"BAO"Y"H,"JIA"Y"T,"LAI"Z"F,"XU"F"C."Nuttritional"component"analysis"and"comprehensive"quality"evaluation"of"18"different"varieties"of"Lonicera"caerulea[J]."Transactions"of"the"Chinese"Society"of"Agricultural"Engineering,"2022,"38(7):"326-335."(in"Chinese)

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[23]"WYBRANIEC"S,"NOWAK-WYDRA"B,"MITKA"K,"KOWALSKI"P,"MIZRAHI"Y."Mi-norbetalains"in"fruits"of"Hylocereus"specis[J]."Phytochemistry,"2007,"68(2):"251-259.

[24]"ZHANG"L"L,"CHEN"C"B,"XIE"F"F,"HUA"Q"Z,"ZHANG"Z"K,"ZHANG"R,"CHEN"J"Y,"ZHAO"J"T,"HU"G"B,"QIN"Y"H."A"novel"WRKY"transcription"factor"HmoWRKY40"associated"with"betalain"biosynthesis"in"pitaya"(Hylocereus"monacanthus)"through"regulating"HmoCYP76AD1[J]."International"Journal"of"Molecular"Sciences"Volume"2021,"2(31):"2171-2171.

[25]"陳妹姑,"林興娥,"李新國,"劉咲頔,"高宏茂,"明建鴻,"戴敏潔,"周兆禧."基于主成分分析和聚類分析的榴蓮品質(zhì)綜合評價(jià)[J]."食品工業(yè)科技,"2023,"44(7):"278-286.CHEN"M"G,"LIN"X"E,"LI"X"G,"LIU"X"D,"GAO"H"M,"MING"J"H,"DAI"M"J,"ZHOU"Z"X."Comprehensive"evaluation"of"durian"quality"based"on"principal"component"analysis"and"cluster"analysis[J]."Science"and"Technology"of"Food"Industry,"2023,"44(7):"278-286."(in"Chinese)

[26]"孫佩光,"程志號,"孫長君,"吳瓊,"郭素霞,"郭剛,"李洪立."16份火龍果種質(zhì)資源果實(shí)營養(yǎng)品質(zhì)分析[J]."分子植物育種,"2022,"20(19):"6585-6592.SUN"P"G,"CHENG"Z"H,"SUN"C"J,"WU"Q,"GUO"S"X,"GUO"G,"LI"H"L."Analysis"of"fruit"nutritional"quality"of"16"pitaya"germplasm"resources[J]."Molecular"Plant"Breeding,"2022,"20(19):"6585-6592."(in"Chinese)

[27]"許文靜,"陳昌琳,"鄧莎,"劉怡君,"呂遠(yuǎn)平."基于主成分分析和聚類分析的藍(lán)莓品質(zhì)綜合評價(jià)[J]."食品工業(yè)科技,"2022,"43(13):"311-319.XU"W"J,"CHEN"C"L,"DENG"S,"LIU"Y"J,"LYU"Y"P."Comprehensive"evaluation"of"blueberry"quality"based"on"principal"component"analysis"and"cluster"analysis[J]."Science"and"Technology"of"Food"Industry,"2022,"43(13):"311-319."(in"Chinese)

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