CN113367185B - 结合采前处理的晚熟柑橘果实贮藏保鲜方法 - Google Patents

结合采前处理的晚熟柑橘果实贮藏保鲜方法 Download PDF

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CN113367185B
CN113367185B CN202110734862.7A CN202110734862A CN113367185B CN 113367185 B CN113367185 B CN 113367185B CN 202110734862 A CN202110734862 A CN 202110734862A CN 113367185 B CN113367185 B CN 113367185B
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周炼
贺明阳
洪敏�
王日葵
韩冷
吴志刚
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Abstract

本发明公开了一种结合采前处理的晚熟柑橘果实贮藏保鲜方法,在晚熟柑橘果实采摘前3‑5周对挂树果实采取杀菌剂和植物生长调节剂复配溶液喷施果面,具体为:对晚熟血橙类柑橘,采前对果面喷施咪鲜胺与2,4‑D混合液;对晚熟杂柑类柑橘,采前对果面喷施溴菌腈、2,4‑D、萘乙酸复配溶液;对晚熟脐橙类柑橘,采前对果面喷施咪鲜胺、2,4‑D、GA3复配溶液。本发明创新性地在柑橘果实采摘前选用杀菌剂和生长调节剂复配对果实进行采前处理,即采前喷施一定剂量的复配液于果面不仅提高了果实的抗病性,使贮藏保鲜效果得以改善,还能防止枯水;采前处理施药可使采后浸泡用药大为减少,更加环保。

Description

结合采前处理的晚熟柑橘果实贮藏保鲜方法
技术领域
本发明属于水果贮藏保鲜技术领域,涉及柑橘果实的贮藏保鲜技术,具体涉及一种结合采前处理的晚熟柑橘果实贮藏保鲜方法。
背景技术
中国柑橘种植历史悠久,柑橘资源最为丰富,栽培面积也是位居世界首位。经济栽培的品种主要有柑、橘、橙、柚、柠檬和其他如枳、金柑和枸橼等类型。丰富的资源加上多样的气候造就了中国柑橘品种多样化。果实成熟期涵盖8月至翌年6月,若按时间分,大致可分为早、中、晚熟品种,一般当年开花挂果翌年成熟采果的为晚熟柑橘。重庆的晚熟柑橘以鲜食为主,重庆地区早中晚熟品种结构从2007年10∶75∶15调整到2014年20∶44∶36的比例,2017年底已调优至25:34:41。近年来,以奉节脐橙、云阳晚橙、万州玫瑰香橙(即塔罗科血橙品系)以及晚熟杂柑等强势拉动供给侧,柑橘产业正在成为重庆周边及三峡库区的支柱产业;快速发展的晚熟柑桔,向采收及采后贮运等相关技术环节提出了迫切需求。
由于晚熟柑桔果实生长时间较长,一般当年挂果后第二年才能完全成熟,长时间挂果也会导致果面更受污染,越冬落果、易腐烂、枯水等问题制约着其良性发展。加之对晚熟柑橘果实的贮藏性能还不甚了解,有必要对晚熟柑桔果实的品种特异性及其采收前后的一些问题进行干预和防控,探究其采前处理的有效手段,以期对果实采收前后有更全面的了解和把握,从而利于其贮运保鲜和有效利用,也为实现采后少药甚至无药的绿色贮藏奠定基础。
目前,对于柑橘果实贮藏保鲜,仍然是采后处理果实,化学方法即以药剂处理果实,几乎没有通过采摘前果实还在树上时的保鲜处理来达到提高贮藏效果的应用报道。目前果实采后处理药剂仍然会用到2,4-D,滥用(劣质、纯度不够)、违规使用2,4-D(超标,多超过250ppm)的现象普遍存在,对环境和人体危害较大,需要寻求一种低毒高效的处理方法。
本发明的采前处理也并非一般意义上的“留树保鲜”,过去的挂树保鲜或留树贮藏多针对中熟品种为了达到延迟采收的目的,类似保花保果,不止一次地施用植物激素类药剂。
发明内容
本发明的目的是针对上述问题,提供一种结合采前处理的晚熟柑橘果实贮藏保鲜方法。
本发明为了实现其目的,采用的技术方案是:
一种结合采前处理的晚熟柑橘果实贮藏保鲜方法,在晚熟柑橘果实采摘前3-5周对挂树果实用杀菌剂和植物生长调节剂复配药剂喷施果面,具体为:
对晚熟血橙类柑橘,采前对果面喷施咪鲜胺与2,4-D复配药液;
对晚熟杂柑类柑橘,采前对果面喷施溴菌腈、2,4-D、萘乙酸复配药液;
对晚熟脐橙类柑橘,采前对果面喷施咪鲜胺、2,4-D、GA3复配药液。
上述技术方案中,对晚熟血橙类柑橘,复配药溶液中含咪鲜胺200-300ul/L、2,4-D80-120mg/L;
对晚熟杂柑类柑橘,复配药溶液中含溴菌腈400-600ul/L、2,4-D 40-60mg/L、萘乙酸45-55mg/L;
对晚熟脐橙类柑橘,复配药溶液中含咪鲜胺400-600ul/L、2,4-D 40-60mg/L、GA315-25mg/L。
所述晚熟血橙类柑橘为塔罗科血橙,所述杂柑品种为不知火,所述脐橙品种为鲍威尔。
上述技术方案中,采前处理即在晚熟柑橘果实采摘前3~5周对挂树果使用杀菌剂和植物生长调节剂复配药剂喷施果面,优选采摘前4周喷施一次。
上述结合采前处理的晚熟柑橘果实贮藏保鲜方法,还包括果实采后未用激素类药剂,只用清水或一点防腐杀菌剂:即果实采下后,对血橙类柑橘使用咪鲜胺200-300ul/L处理果实,对杂柑类柑橘使用咪鲜胺400-600ul/L处理果实。果实采后处理基本按标准《柑橘贮藏NY/T 1189-2006》规范化操作并单果包装入库;库房条件选用试验所得各自适合的贮藏环境条件。
本发明的有益效果是:本发明创新性地在柑橘果实采摘前采取杀菌剂和生长调节剂复配对果实处理,采前喷施果面不仅提高了果实的贮藏性能,保鲜效果明显改善,对枯水也有一定的防止作用。通过本发明实验证实,对晚熟柑橘采前处理可使采后用药大为减少,采前处理结合一定的采后冷藏,有望实现采后处理少药甚至无药的绿色贮藏保鲜,这样更加环保,减少或避免对人类生态的不利影响。
附图说明
图1是塔罗科血橙处理后的贮藏病变结果。
图2是杂柑不知火采后检测各处理的呼吸强度。
图3是采前处理的鲍威尔脐橙贮藏病变和呼吸强度的结果比较。
具体实施方式
下面结合实施例对本发明作进一步说明,但并不因此而限制本发明。
下述实施例中的实验方法,如无特别说明,均为常规方法;所用生物、化学试剂,如无特别说明,均为常规试剂,均可通过商购获得。
实施例1
1材料与方法
塔罗科血橙采自中国农科院柑桔所资源圃,6年以上成熟期树龄;杂柑不知火采于柑桔所贮藏课题试验园的两年生幼龄果树;鲍威尔脐橙产自奉节盛果期果园。
采前处理即为采摘前四周用一定药剂喷施果面1次(用药浓度不到常规方法中采后药剂处理的一半)。各品种果的采摘方式基本相同,每株树上下左右前后中全方位均匀采集;每个处理约3箱(相当于三个试验重复),每箱约80个果(视果实品种大小数量有别)具体数量参见后面试验方案处理表。采后药剂即将果实浸没入药剂混合液中(约2~3s)随即捞出沥干,或者果实在设备流水线上滚动时表面均沾上药剂溶液后即可(进入下一道工序)。
处理药物选用咪鲜胺(液体)、溴菌腈(液体)以及2,4-D(2,4-二氯苯氧乙酸)钠盐(固体)、GA3(赤霉酸)(固体)、NAA(1-萘乙酸)(固体)和防落素(4-氯苯氧乙酸)(固体)。经采前处理的三品种果实采后用药处理都没再使用激素类药剂。
果实从采摘到入库的程序仍按相应标准《柑橘贮藏NY/T 1189-2006》规范化操作并单果包装入库。定期调查果实贮藏病变和呼吸、品质等检测,最后统计各个处理的腐烂率等发病情况以及内在品质(《GB/T 12947-2008鲜柑橘》)等指标数据。呼吸检测采用碱吸收CO2法;可溶性固形物、糖、酸、维生素C等品质分析按国标《GB/T 8210-2011柑桔鲜果检验方法》和中国专利ZL201310752539.8(专利名称:一种提高滴定精度的还原糖直接滴定法)检测。色泽以美国产Gretagmacbeth Color i5色差仪测定,色差中L为亮度值,a-红绿色差,b-黄蓝色差,OJ为仪器对果汁的综合评分;a的正值越大红色越深,b的正值越大黄色越深,ho为色调角,当ho在90°内,其值越小越偏紫红。
试验结果图表中的数据除某些对应编号列出实际数值外均为各处理重复号的平均值和标准误;数据用Excel计算并作图,结果用SPSS(22.0)软件进行差异显著性分析。
试验方案处理如表1所示。
表1.三种晚熟柑橘采收期与采收前后处理试验表
Figure BDA0003141245010000041
2结果
2.1塔罗科血橙
血橙鲜果从2015年1月17日入库到5月19日整个贮期内的病变结果以及出库后移入室内(空调制冷温度20-22℃)约两周的货架期的病变统计如图1所示,数据分析6号处理贮藏病变显著最低,表现较好。
表2为采收时检测各处理果样的品质和色差相关指标数据(均值),数据显示6号处理果样的指标均最高(此时ho越低越偏紫红更好)。贮藏结束时(5月20日)品质检测结果,尽管固形物、糖、酸和维生素C等指标均有所下降,但6号处理的营养指标仍然最好:固形物(Brix)、总糖(g/100ml)、酸(g/100ml)和维生素C(㎎/100ml)分别为10.47±0.29、8.44±0.44、0.48±0.03、54.99±0.82,且总糖(g/100ml)和维生素C(㎎/100ml)显著高于4号处理的8.02±0.11和50.28±0.53。
表2采前处理的血橙采收时品质相关的指标数据
Figure BDA0003141245010000042
呼吸检测值皆表现为6号处理最低:即呼吸强度((CO2)㎎/㎏·h)2月27日4、5、6号处理分别为13.20±0.80、12.13±0.83、11.81±0.39;3月25日检测值分别为12.70±0.62、12.10±0.07、11.39±0.23以及4月30日的检测值分别为14.39±0.81、14.61±3.49、12.88±1.03。这与贮藏病变结果相呼应,也与品质等指标相互印证,即6号处理较好。
2.2不知火
10~13号四个处理的果子贮藏调查结果与呼吸检测数据统计分别如表3和图2所示。贮藏病变结果尽管三个重复的数据平行性差导致各处理之间总发病率差异不显著,但数据分析仍可得90天的腐烂率12号处理显著高于13号处理。
表3采前处理的不知火贮藏病变数据结果
Figure BDA0003141245010000051
比较图2中各处理的呼吸强度,大致趋势一致,而且4月22日和6月2日的检测值12号处理显著高于10号和13号处理。
贮后品质检测发现12号果样的还原糖(4.44±0.31g/100ml)、总酸(0.64±0.08g/100ml)、维生素C(39.29±1.82㎎/100ml)、出汁率(49.01±5.27%)等指标均最低,且维生素C显著最低,这也与贮藏和呼吸结果相呼应。
表4采前处理的不知火采收时的果汁色差数据
Figure BDA0003141245010000052
采收时果汁色差数据见表4,其中显示13号处理果汁色差相关指标均较高。
所以,不知火的采前喷药,效果相比较好的是13号,即溴菌腈+(2,4-D+NAA),不仅明显强于12号处理,且2,4-D浓度减半;同时也反映出生长调节剂复配的优良效果。
2.3鲍威尔脐橙
采前处理果采后贮藏100天的发病情况及其130天后的腐烂结果统计与呼吸强度(100天时)数据如图3所示,可见呼吸强度与发病情况基本对应,其趋势几乎完全一致:即19号处理最好,在4个多月的贮期内腐烂率显著低于其他几个处理。
贮后品质测定(8月10日)结果见表5。
表5采前处理的鲍威尔果实贮后品质检测数据
Figure BDA0003141245010000061
相比而言,19号处理在取样时固形物并非最高的情形下,其酸和维生素C含量却最高(各项指标差异水平参见表中所列不同字母);而清水对照17号处理最差,不仅各项指标均最低,尤其出汁率也最低,反映出它枯水较重,说明采前药剂处理均可降低采后枯水。
由此可见,采前药剂处理皆有较好的贮藏效果,其中19号表现较好,其采后防病效果显著好于17号清水对照,并且采后未用任何药剂处理的情况下初始入库贮藏100天后的总发病率低于5%;而且19号强于18号尽管差异不显著,但采前喷施生长调节剂的浓度进一步降低,即减半量的2,4-D(50ppm)再复配约20ppm的GA3就能达到不错的效果。
3结论
3.1采前喷果以杀菌剂结合一定的生长调节剂施用效果明显,且使用浓度远低于采后处理的用药量,两种植物生长调节剂在总浓度不变下复配效果更佳。采前处理用药也因品种而异:
1、塔罗科血橙:低剂量的咪鲜胺与2,4-D搭配效果不错
2、不知火杂柑:溴菌腈与2,4-D结合萘乙酸使用效果较好
3、鲍威尔脐橙:咪鲜胺与2,4-D和赤霉酸复配效果更好3.2本发明研究的冷藏效果是基于对果实采后品质分析、呼吸检测以及贮藏病变等数据的综合结果,从中也体现了果实的采后病变与其呼吸强度存在很大的相关性,同一品种在相同条件下呼吸强度越大的发病率越高,所以从呼吸强弱可侧面反映出其贮藏性能,即呼吸越强越不耐贮,品质下降更快。

Claims (4)

1.一种结合采前处理的晚熟柑橘果实贮藏保鲜方法,其特征在于:在晚熟柑橘果实采摘前3-5周对挂树果实用杀菌剂和植物生长调节剂复配药剂喷施果面,喷施一次,具体为:
对晚熟血橙类柑橘,采前对果面喷施咪鲜胺与2,4-D复配药液,复配药溶液中含咪鲜胺200-300ul/L、2,4-D 80-120mg/L;
对晚熟杂柑类柑橘,采前对果面喷施溴菌腈、2,4-D、萘乙酸复配药液,复配药溶液中含溴菌腈400-600 ul/L、2,4-D 40-60mg/L、萘乙酸45-55 mg/L;
对晚熟脐橙类柑橘,采前对果面喷施咪鲜胺、2,4-D、GA3 复配药液,复配药溶液中含咪鲜胺400-600 ul/L、2,4-D 40-60mg/L、GA3 15-25mg/L;
且果实采后未用激素类药剂,只用清水或一点防腐杀菌剂清洗浸泡果子:即果实采下后,只对血橙和杂柑类柑橘使用防腐杀菌剂咪鲜胺,浓度分别为200-300 ul/和400-600ul/L。
2.如权利要求1所述的方法,其特征在于:采摘前4周对挂树果实用杀菌剂和植物生长调节剂复配药剂喷施果面。
3.如权利要求1所述的方法,其特征在于:所述晚熟血橙类柑橘为塔罗科血橙,所述杂柑品种为不知火,所述脐橙品种为鲍威尔。
4.如权利要求1所述的方法,其特征在于:果实采后处理基本按标准《柑橘贮藏 NY/T1189-2006》规范化操作并单果包装入库;库房条件选用试验所得各自适合的贮藏环境条件。
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