趙恬 張錦華 袁揚 王胤晨 韋小平 張定紅 高婭妮 羅文菊 陳燕
摘要:【目的】明確中華蜜蜂(簡稱“中蜂”)授粉對獼猴桃產(chǎn)量、經(jīng)濟效益、采收品質(zhì)及貯藏性的影響,為強化中蜂授粉的產(chǎn)業(yè)功能和實現(xiàn)獼猴桃優(yōu)質(zhì)高產(chǎn)提供理論依據(jù)?!痉椒ā恳再F長獼猴桃為研究對象,分別設中蜂授粉、人工授粉和自然授粉3個處理,測定不同授粉方式下獼猴桃的坐果指標、產(chǎn)量因子、采收品質(zhì)和貯藏期間的品質(zhì)變化,估算其經(jīng)濟效益?!窘Y果】與自然授粉和人工授粉相比,中蜂授粉后獼猴桃單株坐果率顯著增加(P<0.05,下同),畸形果率明顯降低,單株坐果率分別提高70.61%和8.94%(絕對值),畸形果率分別降低7.06%和1.19%(絕對值);果實縱橫徑、商品果率、單果質(zhì)量、單株產(chǎn)量、面積產(chǎn)量和產(chǎn)值均顯著增加,單株產(chǎn)量高達26.67 kg,較自然授粉和人工授粉分別增產(chǎn)233.38%和27.00%,面積產(chǎn)量高達20.00 t/ha,產(chǎn)值達24.00萬元/ha,除去成本后效益達20.95萬元/ha,較自然授粉和人工授粉分別增收16.75萬和8.30萬元/ha;采收時果實硬度顯著降低,可溶性固形物、可溶性糖和維生素C含量顯著增加;此外,中蜂授粉可降低貯藏期的果實腐爛率,貯藏45 d后中蜂授粉的果實腐爛率為73.67%,顯著低于自然授粉(96.67%)和人工授粉(89.00%),減緩果實硬度下降及可溶性固形物、可溶性糖、有機酸和維生素C的消耗?!窘Y論】相較于自然授粉和人工授粉,中蜂授粉有助于提高獼猴桃產(chǎn)量和經(jīng)濟效益,改善果實的采收和貯藏品質(zhì),可作為一種增產(chǎn)增收、提質(zhì)增效的授粉方式推廣應用于獼猴桃產(chǎn)業(yè)。
關鍵詞: 中華蜜蜂;獼猴桃;授粉;產(chǎn)量;果實品質(zhì)
中圖分類號:S663.4;S897.3? ? ? ? ? ? ? ? ? ? ? ? ? 文獻標志碼: A 文章編號:2095-1191(2022)04-1152-09
Effects of Apis cerana cerana pollination on the yield
and quality of kiwifruit
ZHAO Tian1, ZHANG Jin-hua1*, YUAN Yang1, WANG Yin-chen1, WEI Xiao-ping2,ZHANG Ding-hong1, GAO Ya-ni3, LUO Wen-ju1, CHEN Yan1
(1Animal Husbandry and Veterinary Medicine Institute,Guizhou Academy of Agricultural Sciences, Guiyang, Guizhou? 550002, China; 2Modern Agricultural Development Institute, Guizhou Academy of Agricultural Sciences, Guiyang,Guizhou? 550006, China; 3Shaanxi Academy of Forestry, Xi’an, Shaanxi? 710082, China)
Abstract:【Objective】To investigate the effect of pollination by Apis cerana cerana on the yield,economic benefit,harvest quality and storage quality of kiwifruit,so as to provide a theoretical basis for strengthening the industrial use of pollination by A. cerana cerana and to achieve high quality and yield of kiwifruit. 【Method】Using Guichang kiwifruit as the research object,the experimental groups were created,which were pollinated in three ways by A. cerana cerana,artificially and naturally. The fruit setting index,yield factor,harvest quality and quality changes during the storage period of kiwifruit were determined,and the potential economic benefits of each type of pollination estimated. 【Result】Compared with natural and artificial pollination,the A. cerana cerana pollinated group showed significantly differences in the fruit setting rate(P<0.05,the same below),increased by 70.61% and 8.94%(absolute value), respectively,and deformity rate decreased by 7.06% and 1.19%(absolute value),respectively. The fruit vertical and horizontal diameters,commodity rate,quality,yield per plant,area yield and production value were significantly increased in the A. cerana cerana pollinated group. Relatived to the artificially and naturally pollinated groups,the yield per plant increased up to 26.67 kg,representing an increase of 233.38% and 27.00%,respectively. The area yield increased up to 20.00 t/ha,with an output value was up to 240000 yuan/ha. After removing the costs involved,the benefit was as high as 209500 yuan/ha,an increase of 167500 and 83000 yuan/ha,relatived to artificial and natural pollination,respectively. Further improvements included a significant decrease in the harvest firmness and significant increases in soluble solids,soluble sugar and vitamin C content. In addition,A. cerana cerana pollination can significantly reduce the rate of fruit decay rate. After 45 days of storage,the decay rate of the A. cerana cerana pollination group was 73.67%,significantly lower than that of the natural pollination group(96.67%) and the artificial pollination group(89.00%),and reduced fruit hardness and consumption of soluble solids,soluble sugars,organic acids and vitamin C consumption. 【Conclusion】Compared with natural and artificial pollination,A. cerana cerana pollination of kiwifruit can improve the yield,harvest and storage qualities of the fruit with economic benefits. This pollination method can be implemented in the kiwifruit production industry to increase production and economic returns with improvements in kiwifruit quality.
Key words: Apis cerana cerana; kiwifruit; pollination; yield; fruit quality
Foundation items:Guizhou Science and Technology Plan Project(QKHZC〔2019〕2294,QKHZC〔2019〕2290,QKHZC〔2021〕General 226,QKHJC〔2019〕1453)
0 引言
【研究意義】獼猴桃(Actinidia chinensis Planch)又名奇異果,為獼猴桃科(Actinidiaceae)獼猴桃屬(Actinidia)多年生藤本植物,因其獨特的口感風味和豐富的營養(yǎng)價值備受人們喜愛(Lim et al.,2016;舒然等,2020)。我國作為獼猴桃原產(chǎn)國,栽培面積和產(chǎn)量多年來穩(wěn)居世界第一(孫雷明和方金豹,2020),據(jù)《中國獼猴桃產(chǎn)業(yè)發(fā)展報告(2020)》顯示,截至2019年底,全國獼猴桃栽培面積29.08萬ha,總產(chǎn)量高達300萬t,獼猴桃產(chǎn)業(yè)已成為推動產(chǎn)業(yè)扶貧和促進鄉(xiāng)村振興的支柱產(chǎn)業(yè)。隨著經(jīng)濟水平的提高,人們在關注產(chǎn)量的同時也越來越重視果實的品質(zhì)和風味。獼猴桃雌雄異株,因此需要傳粉者,特別是昆蟲,以確保雌雄株的花粉傳遞和有效授粉(張敏等,2017;高建有等,2021)。獼猴桃花期短,花朵量大且密集,最佳授粉時間僅為3~5 d,授粉不良易阻礙果實的高水平生產(chǎn)和品質(zhì),我國一般采用人工授粉來解決傳粉問題,但存在成本高、效率低,對農(nóng)作物產(chǎn)量和質(zhì)量的提升效果有限等問題(Azmi et al.,2019)。蜜蜂在與植物的協(xié)同進化中形成了適合采蜜和授粉的身體結構,為全球107種主要作物中的90%以上提供授粉服務(Potts et al.,2016),貢獻了全球約35%的作物產(chǎn)量(Klatt et al.,2014),因此研究蜜蜂授粉對作物生產(chǎn)具有重要意義?!厩叭搜芯窟M展】研究表明,蜜蜂授粉不僅能增加作物產(chǎn)量,還能提高果實及種子的品質(zhì)。如采用蜜蜂為溫室甜椒(Capsicum annum L.)(de Oliveira Cruz et al.,2005)和辣椒(Capsicum chinense)(Cauich et al.,2006)授粉可顯著增加果實重量和種子數(shù)量,顯著降低畸形果數(shù);為黃瓜(Cucumis sativus)授粉可顯著提高果實重量、長度和直徑(Nicodemo et al.,2013);為大棚甜瓜(Cucumis melo L.)授粉可顯著提高結實率、果實重量和籽粒數(shù)(Azmi et al.,2019);為草莓(Fragaria ananassa Duch.)授粉后其結實率更高、畸形率更低、果實更重、色澤更佳,提高商業(yè)價值和延長貨架期(Klatt et al.,2014);為番茄(Solanum lycopersicum L.)授粉可顯著提高果實產(chǎn)量(Hazel and Mario,2021)。關于蜜蜂授粉對獼猴桃產(chǎn)量和品質(zhì)的影響,韓勝明等(2020)研究指出,相較于人工授粉,意大利蜜蜂和中華蜜蜂授粉均能顯著提高獼猴桃的坐果率和產(chǎn)量指標;金平濤等(2020)進行獼猴桃蜜蜂授粉與綠色防控技術集成應用試驗,結果表明,蜜蜂授粉后獼猴桃產(chǎn)量和品質(zhì)得到顯著提升,且果園病蟲害明顯減輕,農(nóng)藥使用減少;李亮等(2020)研究表明,蜜蜂授粉相較常規(guī)授粉,提質(zhì)增產(chǎn)效果明顯?!颈狙芯壳腥朦c】中華蜜蜂(Apis cerana cerana,簡稱“中蜂”)是我國西南部及長江以南地區(qū)主要的傳粉昆蟲,具有很強的采集力、適應性和抗病能力。近年來,應用中蜂授粉已在荔枝(Litchi chinensis Sonn.)(梁盛凱等,2018,2019)、苦瓜(Momordica charantia L.)(鐘娟等,2018)、藍莓(Vaccinium corymbosum L.)(趙東緒,2018;趙東緒等,2019)、黃沙白柚(Citrus maxima (Burm) Merr. cv. Huangsha Yu)(羅文華等,2019)、草莓(Fragaria ananassa Duch.)(張軍飛等,2019)等作物中有所研究,而在獼猴桃產(chǎn)業(yè)的研究和應用較少,關于中蜂授粉對獼猴桃貯藏品質(zhì)的影響目前也鮮見文獻報道。【擬解決的關鍵問題】通過試驗量化中蜂授粉對獼猴桃產(chǎn)量、經(jīng)濟效益、品質(zhì)和貯藏性的影響,旨在加深對被低估的蜜蜂授粉益處的認識,為強化中蜂授粉的產(chǎn)業(yè)功能和實現(xiàn)獼猴桃優(yōu)質(zhì)高產(chǎn)提供理論依據(jù)。
1 材料與方法
1. 1 試驗材料
供試獼猴桃品種為貴長,樹齡和長勢一致,雌雄株比例為4∶1。株距3 m,行距4 m,生長過程中采用常規(guī)的水肥及病蟲害管理方法。進行授粉試驗的蜂群為標準箱飼養(yǎng)的中華蜜蜂,蜂群健康無病、蜂脾相稱,群勢為4脾/箱,由貴州省畜牧獸醫(yī)研究所提供。
1. 2 試驗方法
1. 2. 1 試驗設計 試驗地位于貴州省貴陽市修文縣獼猴桃種植基地,于2020年4—11月進行獼猴桃授粉及授粉效果測定試驗。在獼猴桃種植區(qū)分別設中蜂授粉區(qū)、人工授粉區(qū)和自然授粉區(qū)各2個,每個區(qū)域均包含連續(xù)生長的4株雌樹和1株雄樹。中蜂授粉區(qū)采用10 m×5 m×3 m的60目尼龍紗網(wǎng)罩嚴,5%~10%的雌花開放時(李亮等,2020)將一箱4脾的中華蜜蜂放入網(wǎng)罩內(nèi);蜂群提前隔離2 d以清除體上花粉,并采用獼猴桃雄花混合糖漿誘喂,糖水噴灑花朵。人工授粉區(qū)也采用10 m×5 m×3 m的60目尼龍紗網(wǎng)罩嚴,于雌花開放后1~3 d的盛花期,每天上午采用常規(guī)的人工對花授粉法進行授粉,每天授3次,連續(xù)授粉3 d(賴康等,2019)。自然授粉區(qū)不進行任何人為的授粉措施,使其在完全自然狀態(tài)下進行風媒和蟲媒授粉,此處理為對照組(CK)。
1. 2. 2 測定項目及方法 盛花期對每株樹的花朵數(shù)量進行統(tǒng)計,待坐果后統(tǒng)計坐果數(shù)和畸形果數(shù),計算坐果率和畸形果率。果實成熟后將試驗樹逐一采摘稱重測產(chǎn),統(tǒng)計商品果(單果重>60 g)率(黃興成等,2020)。
初采后每組處理各隨機選擇15個果實測定外觀指標:采用游標卡尺測量果實縱徑和橫徑;電子天平測定果實質(zhì)量。將果實置于室溫下陰涼處貯存,貯藏期間每隔5 d每組隨機選取15個果實測定品質(zhì)指標:用GY-4型硬度計測定果實硬度(徐燕紅等,2020);用WYT-4型手持折射儀測定果實中可溶性固形物含量(楊暢等,2019);采用分光光度法測定可溶性糖含量(陳美艷等,2019);采用酸堿滴定法測定可滴定酸含量(楊暢等,2019);采用2,6-二氯靛酚滴定法測定維生素C含量(曹健康等,2007);觀察記錄果實的腐爛情況,計算腐爛率。
1. 3 統(tǒng)計分析
利用Excel 2010和SPSS 20.0對試驗數(shù)據(jù)進行統(tǒng)計分析和顯著性方差分析,并制圖。
2 結果與分析
2. 1 不同授粉方式對獼猴桃坐果的影響
由表1可知,相比于自然授粉和人工授粉,中蜂授粉后獼猴桃坐果率顯著增加(P<0.05,下同),畸形果率明顯降低,單株坐果率分別提高70.61%和8.94%(絕對值),畸形果率分別降低7.06%和1.19%(絕對值)。表明中蜂授粉有助于獼猴桃坐果,減少畸形果。
2. 2 不同授粉方式對獼猴桃產(chǎn)量構成因子及經(jīng)濟效益的影響
相比于自然授粉和人工授粉,中蜂授粉后獼猴桃果實縱徑、橫徑、商品果率、單果質(zhì)量、單株產(chǎn)量和面積產(chǎn)量均顯著增加,單株產(chǎn)量26.67 kg,面積產(chǎn)量達20.00 t/ha,其中單株產(chǎn)量較自然授粉和人工授粉分別增產(chǎn)233.38%和27.00%(表2)。表明中蜂授粉可顯著促進獼猴桃果實縱橫徑生長和體積膨大,增加單果質(zhì)量,從而提高單株產(chǎn)量和面積產(chǎn)量。
由表3可知,中蜂授粉后獼猴桃產(chǎn)值高達24.00萬元/ha,顯著高于自然授粉和人工授粉;人工授粉投入成本最高,達5.25萬元/ha,其次為中蜂授粉(3.05萬元/ha)和自然授粉(3.00萬元/ha);除去成本后,中蜂授粉效益高達20.95萬元/ha,顯著高于自然授粉和人工授粉,分別增收16.75萬和8.30萬元/ha,表明中蜂授粉對獼猴桃的增產(chǎn)增收效果顯著。
2. 3 不同授粉方式對獼猴桃果實采收品質(zhì)的影響
由表4和圖1可知,獼猴桃果實采收后,中蜂授粉的果實硬度顯著低于自然授粉和人工授粉,表明中蜂授粉可促進獼猴桃早熟,縮短成熟期而使果實提前上架;可溶性固形物、可溶性糖和維生素C含量及固酸比均顯著高于自然授粉和人工授粉,可滴定酸含量低于自然授粉和人工授粉,但差異不顯著(P>0.05,下同),表明中蜂授粉可增加獼猴桃果實甜度和風味,增強果實的抗氧化性,提高果實品質(zhì)。
2. 4 不同授粉方式對獼猴桃果實貯藏品質(zhì)的影響
2. 4. 1 不同授粉方式對貯藏期果實硬度的影響
由圖2可知,采收時中蜂授粉的獼猴桃果實硬度顯著低于自然授粉和人工授粉,隨著貯藏時間的延長,3種授粉方式的果實硬度均不斷下降,其中自然授粉的硬度下降速度最快,貯藏10 d后顯著低于人工授粉和中蜂授粉,40 d后硬度下降為0。中蜂授粉和人工授粉在貯藏5~20 d硬度差異不顯著,25 d后中蜂授粉的果實硬度顯著高于人工授粉,表明中蜂授粉延緩獼猴桃果實質(zhì)地變軟的效果最顯著,抑制了果實中有機物和水分消耗,使果實保持較高的硬度,更有利于貯藏。
2. 4. 2 不同授粉方式對貯藏期果實腐爛率的影響
由圖3可知,3種授粉方式的獼猴桃果實在貯藏前15 d腐爛率均為0,之后隨著貯藏時間的延長腐爛率逐漸升高,貯藏20 d后,中蜂授粉的果實腐爛率始終低于人工授粉和自然授粉,貯藏45 d后中蜂授粉的果實腐爛率為73.67%,顯著低于自然授粉(96.67%)和人工授粉(89.00%)。表明中蜂授粉能加強獼猴桃果實的貯藏性,延緩果實腐爛。
2. 4. 3 不同授粉方式對貯藏期果實可溶性固形物含量的影響 可溶性固形物含量的高低可體現(xiàn)果實的成熟程度和品質(zhì),用以衡量果實風味和貯藏效果(姜瑜倩等,2012;田津津等,2016)。3種授粉方式的獼猴桃果實可溶性固形物含量在貯藏期間均呈先快速上升后緩慢下降的變化趨勢,上升是由于淀粉等多糖類物質(zhì)不斷水解為可溶性糖,其中自然授粉的上升速率最快、采后10 d達峰值,人工授粉采后15 d達峰值,中蜂授粉的上升速率最慢、采后25 d達峰值(圖4),表明中蜂授粉延緩獼猴桃果實中后熟的效果最佳。在貯藏后期,呼吸作用消耗糖的速度大于可溶性糖積累的速度,因此可溶性固形物含量呈下降趨勢,自然授粉的降幅最大,中蜂授粉的降幅最小,表明中蜂授粉可減緩果實貯藏期間多糖的轉化,降低可溶性固形物的損耗,保持果實較好的口感。
2. 4. 4 不同授粉方式對貯藏期果實可溶性糖含量的影響 采收時中蜂授粉的獼猴桃果實可溶性糖含量顯著高于自然授粉和人工授粉,3種授粉方式的獼猴桃果實可溶性糖在貯藏期間的變化趨勢與可溶性固形物相似,表現(xiàn)為先升高后降低的變化趨勢,中蜂授粉相較自然授粉和人工授粉的峰值期分別延后15和10 d,且整個貯藏期可溶性糖含量均高于其余2種授粉方式(貯藏15 d除外)(圖5)。表明中蜂授粉可使獼猴桃果實貯藏期的可溶性糖維持在較高水平。
2. 4. 5 不同授粉方式對貯藏期果實可滴定酸含量的影響 可滴定酸和糖類都是衡量果實風味、口感和品質(zhì)的重要性狀之一(王瑞玲,2010)。3種授粉方式的獼猴桃果實在貯藏期間可滴定酸含量均呈下降趨勢,前20 d三者差異不顯著,25 d后中蜂授粉和人工授粉顯著高于自然授粉(圖6)。表明中蜂授粉和人工授粉均可抑制貯藏過程中獼猴桃果實的呼吸作用對有機酸的消耗,減緩有機酸下降,從而延緩采后衰老,延長貯藏期,其中中蜂授粉的效果最佳。
2. 4. 6 不同授粉方式對貯藏期果實固酸比的影響
固酸比是可溶性固形物與可滴定酸的比值,是衡量果實成熟度和品質(zhì)的參考指標之一。由圖7可知,3種授粉方式的獼猴桃果實在貯藏過程中固酸比均呈上升趨勢,表明隨著貯藏期的延長果實風味越濃。前期呈上升趨勢主要是由于果實后熟導致可溶性固形物含量升高,后期則主要由于可滴定酸作為呼吸底物不斷被消耗,因而固酸比上升。貯藏前期(0~20 d)中蜂授粉的固酸比高于自然授粉和人工授粉,但差異不顯著,貯藏末期(40~45 d)中蜂授粉和人工授粉均顯著高于自然授粉,其中中蜂授粉效果最佳,表明中蜂授粉后獼猴桃果實能一直保持最佳風味。
2. 4. 7 不同授粉方式對貯藏期果實維生素C含量的影響 獼猴桃中維生素C含量豐富,具有很強的抗氧化性(Zolfaghari et al.,2010)。由圖8可知,3種授粉方式的獼猴桃果實維生素C含量均呈先上升后下降的變化趨勢,貯藏前期果實后熟導致維生素C含量增加,后期由于呼吸作用和酶反應等造成維生素C不斷分解。在整個貯藏過程中,中蜂授粉的果實維生素C含量始終顯著高于自然授粉和人工授粉(貯藏35 d除外),人工授粉的果實維生素C含量始終顯著高于自然授粉(貯藏5 d除外),表明中蜂授粉有利于獼猴桃果實貯藏前期的維生素C積累,也可減緩貯藏后期維生素C分解損耗,提高果實貯藏品質(zhì)。
3 討論
3. 1 中蜂授粉對獼猴桃產(chǎn)量及經(jīng)濟效益的影響
研究表明,從花藥中釋放出的成熟花粉通常壽命很短(約30 min)(de Oliveira Cruz et al.,2005),而人工授粉需要很高的精確度和技能,授粉不及時或不均勻都會導致果實無法充分受精。中蜂授粉優(yōu)于人工授粉的機制在于中蜂可識別成熟花粉,將更多活力更高、親和力更強的花粉均勻地轉移到柱頭,植物充分受精后產(chǎn)生生長素和赤霉素,這些激素通過促進子代細胞的生長來誘導果實生長,從而防止果實畸形,提高果實質(zhì)量(Shin et al.,2007)。有研究認為,草莓經(jīng)蜜蜂授粉后果肉細胞數(shù)目迅速增加,體積迅速膨大,每日的縱徑生長量顯著高于人工授粉(楊潔等,2017);柑橘經(jīng)蜜蜂授粉后果實縱徑和橫徑的周生長量均顯著高于自然授粉(高麗嬌等,2019)。本研究結果與上述研究結果類似,與自然授粉和人工授粉相比,中蜂授粉的獼猴桃坐果率高、畸形果率低、果實體積和質(zhì)量大,單株產(chǎn)量達26.67 kg,折合面積產(chǎn)量達20.00 t/ha,產(chǎn)值24.00萬元/ha,除去成本后效益為20.95萬元/ha,在增產(chǎn)和提高經(jīng)濟效益方面體現(xiàn)出極大的優(yōu)勢。
3. 2 中蜂授粉對獼猴桃采收品質(zhì)的影響
果實采收后其品質(zhì)和口感取決于硬度、可溶性固形物、可溶性糖、可滴定酸、固酸比和維生素C等綜合成分。羅文華等(2019)采用中蜂和意蜂對黃沙白柚授粉,其果實總糖含量和糖酸比顯著高于對照組;Yong等(2007)對甜瓜進行無刺蜜蜂授粉,其果實在硬度和甜度方面均優(yōu)于人工授粉;Gajc-Wolska等(2011)采用熊蜂對黃瓜授粉后果實硬度更高,品質(zhì)更好;高麗嬌等(2019)研究發(fā)現(xiàn),意蜂對柑橘授粉后,其維生素C含量、糖酸比等多項品質(zhì)指標均優(yōu)于對照組。與上述研究結果相似,本研究發(fā)現(xiàn),中蜂授粉后獼猴桃采收期硬度顯著低于自然授粉和人工授粉,可溶性固形物、可溶性糖和維生素C含量及固酸比均顯著高于自然授粉和人工授粉,可滴定酸含量低于自然授粉和人工授粉,表明中蜂授粉可促進獼猴桃早熟,使其提前上架,增強果實風味、質(zhì)地和口感,提高其抗氧化性。究其原因可能是中蜂能準確識別高活力花粉并充分利用有效花,保證花粉在活力最高階段完成受精,進而有利于各種養(yǎng)分的供給,促進果實發(fā)育,改善果實品質(zhì)。韓勝明等(2020)采用中蜂和意蜂為獼猴桃授粉,坐果率和產(chǎn)量均優(yōu)于人工授粉,但在干物質(zhì)、色彩度、糖含量和硬度等品質(zhì)指標上無明顯差異,本研究結果與之有所不同,可能與品種及地域差異等因素有關。
3. 3 中蜂授粉對獼猴桃貯藏品質(zhì)的影響
大部分水果和蔬菜在收獲后由于運輸損壞和儲存變質(zhì)而浪費,因此貨架期很大程度上影響果蔬的商業(yè)價值。貨架期長短和貯藏品質(zhì)主要取決于果實硬度(Ariza et al.,2011;林怡,2019),較高的硬度有利于延長果實保鮮期及貨架銷售期(黃文俊等,2020;牛佳佳等,2020);此外,可溶性固形物、可溶性糖和可滴定酸含量也是判斷果實成熟衰老和貯藏性的關鍵因子。本研究中,中蜂授粉可延緩獼猴桃果實貯藏期間硬度的下降,降低腐爛率,降低貯藏后期可溶性固形物、可溶性糖和有機酸的損耗,使固酸比和維生素C含量保持在較高水平,提高果實的貯藏品質(zhì),延長貨架期,與Klatt等(2014)對草莓的研究結果類似。究其原因可能在于中蜂充分高效的授粉介導果實中生長素大量積累,生長素通過調(diào)控與果實成熟相關基因的表達,延緩了果實衰老軟化,從而保持果實硬度,使其處于新鮮狀態(tài),延長保質(zhì)期(賈海鋒等,2016)。貯藏過程中硬度越大,細胞壁越穩(wěn)定,呼吸和蒸騰作用減弱,從而限制糖和酸的代謝損耗,推遲可溶性固形物和可溶性糖的峰值期,延緩果實后熟,使果實保持較高的固酸比和更好的品質(zhì)風味(Caner et al.,2008)。因此,中蜂授粉對獼猴桃的貯藏品質(zhì)產(chǎn)生了間接的積極影響。
4 結論
中蜂授粉后獼猴桃表現(xiàn)出早果高產(chǎn),具有較高的采收品質(zhì)和貯藏品質(zhì),相較自然授粉和人工授粉在增產(chǎn)增收、提高果實品質(zhì)和增加保質(zhì)期上更具優(yōu)勢。因此,可考慮將中蜂授粉作為一種降本增效的授粉方式推廣應用于獼猴桃產(chǎn)業(yè),以獲得更高的經(jīng)濟效益。
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收稿日期:2021-09-17
基金項目:貴州省科技計劃項目(黔科合支撐〔2019〕2294號,黔科合支撐〔2019〕2290號,黔科合支撐〔2021〕一般226號,黔科合基礎〔2019〕1453號)
通訊作者:張錦華(1973-),https://orcid.org/0000-0001-6834-8300,研究員,主要從事特種經(jīng)濟動物研究工作,E-mail:420506337 @qq.com
第一作者:趙恬(1992-),https://orcid.org/0000-0003-2927-8615,主要從事蜜蜂授粉技術、蜜源植物和牧草種質(zhì)資源研究工作,E-mail:zhaotianyeah@163.com