Comparison The Physiology Quality And Disease Resistance On Different Mature Of Postharvest Melon Fruit

Melon is an important native and famous fruit representing an especial variety of Xinjiang, which with aroma, fleshy and juicy was known by the world, sold well all over the country and exported to many countries, melon has an important position of the horticultural industry in Xinjiang. After harvest, the fruit aged and the quality deteriorated rapidly during the high temperature and long distance transportation.Melon fruit are susceptible to decay and have short shelf under aging of fruit condition.The decay of melon fruit took huge losses during postharvest storage and transportation, it became a key obstruction to block the fine development of melon industry. It is crucial to study the regulation and control technology to delay the deterioration and aging, increase the disease resistance, reduce the decay of melon.In this paper“Xizhoumi No.25”, “Xizhoumi No.17”, “Jiashi” melon fruit were used as research materials to study the change of physiological quality, cell wall metabolism, active oxygen metabolism and disease resistance on different mature melon fruit. Provide theoretical basis for the storage period and preservation of different mature melon fruit.The research contents are as follows:( 1) “Xizhoumi No.25”, “Xizhoumi No.17”, “Jiashi” melon fruit storaged at room temperature(25±2?, RH80%~85%), their physiological and quality changes were researched. The experimental results showed that there was a large difference between different maturation melon fruit postharvest storage resistance. “Xizhoumi No.17”, “Jiashi” melon fruit showed good resistance in the process of storage reservoir properties. There weightlessness rate, SSC, Vc content, Titratable acid content, hardness index decline more slowly, such as relative conductivity, MDA content rise more gently. SSC, Vc content,Titratable acid content such as nutritional indexes of “Xizhoumi No.25” were higher than in “Xizhoumi No.17” and “Jiashi” melon fruit, but its hardness is small low and decreased rapidly in the later storage,relative conductivity and MDA content rise faster in the process of storage, the overall quality declined faster, storage characteristic was significantly lower than “Xizhoumi No.17” and “Jiashi” melon fruit.( 2) With the purpose of studying the softening mechanism of melon fruit “Xizhoumi No.25”,“Xizhoumi No.17”, “Jiashi” melon fruit were storaged at room temperature(25±2?, RH80%~85%). The experimental results showed that kept firmness of “Xizhoumi No.17” and “Jiashi” melon fruit, suppressed the protopectin, covalent pectin, cellulose content to decline, and restrain the soluble pectin, inonic pectin to increased.Could restrain the activity of CX, PG, PME, ?-Afa to delay aging of “Xizhoumi No.17” and“Jiashi” melon fruit.(3)After inoculation treatment, “Xizhoumi No.25”, “Xizhoumi No.17”, “Jiashi” melon fruit were storaged at room temperature(25±2?, RH80%~85%).During storage the use of vaccination sickle bacteria compared with chain, spore to study different mature melon fruit disease spot diameter, depth, lignin content, PAL, CHT, GLU enzyme activity variation trend. The experimental results showed that whether vaccination chain spore or sickle, the disease spot diameter and depth ranked in this order: “Xizhoumi No.25” high, Xizhoumi No.17”, “Jiashi” melon. “Jiashi” melon fruit of CHT, GLU enzyme activity were higher than “Xizhoumi No.17” and “Xizhoumi No.25”. All the different mature period of melon fruit's PAL appear peak value in earlier storage time that better promote the synthesis of lignin.(4)After inoculation treatment, “Xizhoumi No.25”, “Xizhoumi No.17”, “Jiashi” melon fruit were storaged at room temperature(25±2?, RH80%~85%)to research the relationship between fruit senescence and the ROS metabolism of different mature melon fruit. The content of O2-and the activity of MDA presents the downward trend after rising firs during the storage. The activity of POD and CAT which can remove H2O2 present the upward trend after downtrend firs and that of “Jiashi” melon fruit were higher than “Xizhoumi No.17” and “Xizhoumi No.25” which illustrated H2O2 removal ability of “Jiashi” melon was strongest. This study also found that the APX activity of “Jiashi” melon fruit is significantly higher than the“Xizhoumi No.17” and “Xizhoumi No.25”, can effectively reduce the accumulation of reactive oxygen species, thus effectively preventing the membrane lipid peroxidation and fruit senescence.