热处理和壳聚糖涂膜对采后接菌哈密瓜生理生化特性的影响

Effects of Heat-treatment and Chitosan Coating on Physiological and Biochemical Characteristics of Hami Melon Inoculated Alternaria alternata

以‘西州蜜25号’哈密瓜果实为试材,分别进行55℃热水浸渍3min、2%壳聚糖涂膜及两者结合处理(55℃热水浸渍3min+2%壳聚糖涂膜),以不进行任何预处理为对照,再对各处理的哈密瓜接种交链孢菌(Alternariaalternata),研究接菌哈密瓜在常温贮藏过程中抗病性和相关生理生化指标的变化情况。结果表明,与对照相比较,3种预处理均能明显抑制哈密瓜细胞膜渗透率、呼吸强度、乙烯释放量上升,显著提高贮藏后期果实几丁质酶、β-1,3-葡聚糖酶、苯丙氨酸解氨酶和过氧化物酶的活性,从而增强了哈密瓜的抗病性,有效降低贮藏过程中接菌哈密瓜病斑直径和病斑深度、防止哈密瓜的腐烂变质,并以55℃热水浸渍3min+2%壳聚糖涂膜结合处理的效果最佳。

‘Xizhoumi 25＇ Hami melon as test materials,the total four treatments：melon soaked in 55℃ hot water for 3 min,melon coated by 2% of chitosan,melon treated by two combination （heat treatmentq-chi tosan coating）, melon not treated as CK, then the melons were inoculated Alternaria alternata. The changes of disease resistance and physiology and biochemistry of melon were mainly studied. The results showed that elec- trolyte permeability,the respiratory rate and ethylene production rate were inhibited obviously,and GHT, GLU,PLA and POD activities were increased significantly at the post-storage by three treatments compa- ring with CK,thus the addition of lesion diameter and lesion depth were decreased effectively during stor age, the resistance of disease was enhanced, rot was prevented effectively. The combination treatment was the best.