中国农业科学 ›› 2020, Vol. 53 ›› Issue (23): 4918-4928.doi: 10.3864/j.issn.0578-1752.2020.23.016

• 园艺 • 上一篇    下一篇

不同O2浓度对鸭梨采后生理代谢及贮藏品质的影响

杜艳民(),王文辉(),贾晓辉,佟伟,王阳,张鑫楠   

  1. 中国农业科学院果树研究所/辽宁省果品贮藏与加工重点实验室,辽宁兴城 125100
  • 收稿日期:2020-03-30 接受日期:2020-06-09 出版日期:2020-12-01 发布日期:2020-12-09
  • 通讯作者: 王文辉
  • 作者简介:杜艳民,E-mail: duyanmin@caas.cn
  • 基金资助:
    国家现代梨产业技术体系(CARS-28);国家自然科学基金(32001761)

The Effects of Different Oxygen Concentration on Postharvest Physiology and Storage Quality of Yali Pear

DU YanMin(),WANG WenHui(),JIA XiaoHui,TONG Wei,WANG Yang,ZHANG XinNan   

  1. Institute of Pomology, Chinese Academy of Agricultureal Sciences/Key Laboratory of Fruit Storage and Processing of Liaoning Province, Xingcheng 125100, Liaoning
  • Received:2020-03-30 Accepted:2020-06-09 Online:2020-12-01 Published:2020-12-09
  • Contact: WenHui WANG

摘要:

【目的】明确环境氧气(O2)浓度对鸭梨采后贮藏品质及生理代谢的影响,为鸭梨采后生理病害防控,延长贮藏期提供理论依据。【方法】将采自河北石家庄地区的鸭梨经缓慢降温后置于气调试验箱,设置1.0%、2.0%、3.0%、5.0%及10.0%等不同O2浓度梯度,CO2浓度为0.5%,以空气处理为对照,分别于贮藏150、210和270 d及货架7或10 d,调查鸭梨虎皮指数和黑心指数,测定果实硬度、可溶性固形物(SSC)、可滴定酸(TA)、抗坏血酸(AA)及色泽变化情况,利用气相色谱分析测定果肉和果心组织乙醇含量变化情况,监测果实呼吸速率和乙烯产量;利用实时荧光定量PCR对鸭梨乙烯合成关键基因PbACSPbACO表达变化情况进行测定。【结果】低氧处理显著降低了鸭梨贮藏期间果实黑心指数和虎皮指数,贮藏270 d及货架7 d,鸭梨采后生理病害发病程度由高到低依次为:CK>10.0% O2>5.0% O2>1.0% O2>3.0% O2>2.0% O2;同时,延缓了贮藏早期果实TA和AA下降,推迟了果实果面转黄。气调贮藏150 d,果肉和果心乙醇含量显著升高,O2浓度与乙醇含量呈负相关,乙醇含量范围为150.89—806.12 mg?L -1,货架后乙醇含量下降;对照果实贮藏270 d,果实乙醇含量快速积累,衰老褐变加剧;同时,5.0%及以下O2显著抑制了贮藏后乙烯产量,推迟了乙烯释放高峰;1.0%—3.0% O2处理显著抑制了果皮组织中PbACO1PbACO3PbACS1的表达。【结论】1.0%—3.0% O2处理更好地抑制了鸭梨采后虎皮病的发生,推迟了乙烯释放高峰,延缓了果实TA和AA下降,显著抑制了果皮组织中PbACO1PbACO3PbACS1表达,更好地维持了果皮亮度及白度,鸭梨贮藏期明显延长。但1.0% O2处理在一定程度上增加了鸭梨贮藏末期黑心病风险,建议生产中鸭梨最佳O2浓度参数为3.0%—5.0%。

关键词: 鸭梨, O2, 生理病害, 品质, 乙烯

Abstract:

【Objective】The aim of this study was to clarify the effects of environment oxygen concentration on postharvest physiology and storage quality, affording the theory basis to prevent the postharvest disorders and prolong the storage period of Yali fruit. 【Method】Pear samples were harvested from the commercial orchard in Shijiazhuang city, Hebei province. The fruits of uniform size and ripeness without insect pests or mechanical injury were selected as research materials. The selected fruits were put into controlled atmosphere chambers, and precooling at 8℃ for 48 h, and then declined by 1℃ for every 2 days, and finally storage at (0±0.5)℃ (RH>95%). Then the controlled atmosphere (CA) was established under different O2 concentrations (1.0%, 2.0%, 3.0%, 5.0% and 10.0%) plus 0.5% CO2, and taking air as control. Fruit firmness (FF), soluble solids content (SSC), titratable acidity (TA), ascorbic acid (AA), ethanol, respiration rate, ethylene production and the relative expression of ethylene biosynthesis genes PbACS and PbACO were determined after the fruits storage for 150 d, 210 d and 270 d, respectively. 【Result】The heart browning incidence and superficial scald incidence were both declined significantly under CA treatments during long period storage. More specifically, after storage for 270 d and shelf-life for 7 d, the disorder prevention efficiency were followed by the order of CK>10.0% O2>5.0% O2>1.0% O2>3.0% O2>2.0% O2. Besides that, the lower O2 treatments maintained TA and AA contents at a higher level in the early storage period, and delayed the yellow-turning of peel; ethanol was accumulated much more under the lower O2 concentration, which ranged from 150.89 mg?L -1 to 806.12 mg·L -1 after storage for 150 d; while with the increasing senescence browning of fruit in air, the ethanol content peaking at 1 500 mg·L -1 after storage for 270 d. 5.0% and lower O2 inhibited the ethylene biosynthesis and delayed the peaking time, and 1.0%-3.0% O2 could prohibit the relative expression of PbACO1, PbACO3 and PbACS1 genes in pericarp tissue significantly. 【Conclusion】1.0%—3.0% O2 prohibited the superficial scald occurrence significantly, and delayed the decrease of TA and AA, inhibited the biosynthesis of ethylene and delayed the peaking time, down-regulated the relative expression of PbACO1, PbACO3 and PbACS1 genes in pericarp tissue, prolonged the storage period of Yali pear significantly. However, 1.0% oxygen treatment increased the risk of heart browning to some extent. Therefore, the optimum oxygen concentration was proposed at 3.0%-5.0% in commercial practice.

Key words: Yali pear, oxygen, disorders, quality, ethylene