Influence of Impact Stress on the Postharvest Physiological and Chemical Properties of Cabbage Heads
Influence of Impact Stress on the Postharvest Physiological and Chemical Properties of Cabbage Heads
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冲击应力对甘蓝采后生理化学特性的影响
DOI：
10.5891/jafps.37.273
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
T. Shiina
中科院分区：
文献类型：
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作者：
M. Thammawong;T. Kaneta;N. Nakamura;Makoto Yoshida;Ayaka Soga;T. Shiina
由于采后处理（包括大宗储运）造成的机械损伤对新鲜农产品的产量和采后品质有重要影响，本研究探讨了采后冲击胁迫对甘蓝（Brassica oleracea var. Capitata L.）生理化学特性的影响。为了模拟散装处理过程中发生的冲击应力，在商业收获阶段采摘的卷心菜从不同高度（10、20、40和80厘米）跌落到平坦的刚性混凝土地板上。在20℃条件下贮存6 d，考察了滴灌处理对呼吸速率和各种糖类（蔗糖、葡萄糖和果糖）含量的影响。滴落处理后不久，呼吸速率增加与滴落高度升高相关。但贮藏1天后，呼吸速率下降。在第1天和第3天，所有样品的糖含量都略有变化。在第6天，从80和40cm下降的白菜中果糖和总糖（蔗糖、葡萄糖和果糖的总和）含量最低。冲击胁迫对白菜头的主要影响包括呼吸速率的增加和糖含量的损失。另外，对落菜进行的控制气氛处理试验表明，在20℃贮藏过程中，控制气氛处理降低了落菜呼吸速率的上升，减缓了含糖量的损失，可能抑制了冲击应力对落菜造成的严重伤害。总体而言，冲击胁迫对白菜采后的理化性质（呼吸速率）和贮藏期间的理化性质（含糖量）均有明显影响。这些变化还受到应力水平强度（下降处理的高度）和施加应力处理后的时间的影响。因此，快速和适当的采后处理和储存管理将延缓白菜质量恶化的开始，延长其保质期。
Because the mechanical damage caused by postharvest handling （ including bulk storage and transport）plays an important role in the yield and the postharvest quality of fresh produce, the effect of postharvest impact stress on the physiological and chemical properties of cabbage（ Brassica oleracea var. Capitata L.）was investigated in this study. To simulate the impact stress occurrence during the bulk handling practice, cabbage picked at commercial harvest stage was dropped from different heights（１０, ２０, ４０, and ８０cm）onto a flat, rigid concrete floor. The effects of the dropping treatment on the respiration rate and on the content of various sugars（sucrose, glucose, and fructose）were evaluated during storage at ２０℃ for ６ days. Shortly after the dropping treatment, an increased rate of respiration correlated with a higher dropping height. However, a decreased respiration rate was observed after one day of storage. The sugar content of all samples changed slightly at days １ and ３. At day ６, cabbages dropped from ８０ and ４０cm showed the lowest content of fructose and total sugar（the sum of sucrose, glucose, and fructose）. The major effects of impact stress on cabbage heads include increases in the respiration rate and a loss of sugar content. In addition, tests of controlled atmosphere（CA）treatment on dropped cabbages showed that CA likely inhibited the severe damage caused by impact stress on cabbages because it reduced the rise in respiration rate and slowed the loss of sugar content in dropped cabbages during storage at ２０℃. Overall, impact stress obviously affects the postharvest physicochemical properties of cabbage just after impact occurrence（respiration rate）and during storage（sugar content）. These changes are also influenced by the strength of the stress level（height of dropping treatment）and the time period after the application of the stress treatment. Rapid and appropriate postharvest handling and storage management, therefore, will delay the onset of deterioration of cabbage quality and extend its shelf life.