Changes Of Quality And Physiological Characteristics In Garlic Bulb During Storage

The effect of different treatment including cold storage ,radiation, chitosan coating and heat treatment on storage quality and physiological characteristics in garlic bulb were studied in this article ,using Cangshan garlic and Russian garlic as the test material. Results were as follows:1.Dormancy releasing of garlic bulb could be inhibited by cold storage at -3℃.Half a year later, The internal sprouting index of Cangshan garlic and Russian garlic slowly increased ,which were lower 0.8 and 0.836 than that of control .Dry matter content of Cangshan garlic and Russian garlic was higher 5.43% and 6.61% than that of control.Both the soluble Pr and sugar content showed a constantly increaseing trendency . The content of soluble Pr was higher than that of the radiation and the control. Three months later, the soluble sugar content of cold storaged Russian garlic was higher than that of the control, While there was no obvious difference of soluble sugars content in Cangshan garlic bewteen the cold storage and the control. The MDA content increased quickly, decreased rapidly subsequently,then maintain in certain level.The allicin content was obviously lower than that in the control.2.Radiation using 60Co-γcould obviously inhibit the growth of scaly bud in garlic bulb, scaly bud length slightly increased and the internal sprouting index of Cangshan garlic and Russian garlic were lower 0.76 and 0.731 than that of control ,dry matter content decreased violent and were lower 5.5% and 4.5% than that of control afer half a year . Soluble protein content of Cangshan garlic treated by radiation increased slowly and didn't show obviously difference from the control,but Russian garlic's of it first decreased,then increased rapidly and it was obviously lower the the control one month later.Soluble sugar content increased at the beginning and then decreased.Both Cangshan garlic storged for four months and Russian garlic for five months reached its content peak that was 6.88% and 6.53% which was higher than the control. MDA content significantly lower than the control two months later.The allicin content showed trend that first increased and then decreased ,slightly higher than the control in the first month and obviously lower than the control during the rest storage periods.3.The bulbil growth rate can be reduced by different concentration chitosan treatment.. It was lower in Cangshan garlic treated by 0.5% and 1% chitosan,and was lower in Russian garlic treated by 2%. Dry matter content of Cangshan garlic treated by 1% and 2% chitosan was higher than 0.5%,its content of Russian garlic treated by 1% was the lowest but higher than the control.Descent range of soluble Protein content was 1%<2%<0.5%, towards Russian garlic,2% chitosan treatment did best effect on mitigation of descent range, the second was 0.5% chitosan treatment,and the worst one was 1% chitosan treatment. Soluble sugars content increased obviously,2% chitosan treatment for Cangshan garlic did best effect and its content was the highest during the whole periods, and Russian garlic was reverse.During the first two months, allicin content of Cangshan garlic was 2%>1%>0.5%>the control, allicin content of Russian garlic treated by 0.5% was the highest during the first three months ,but it was lower treated by 1% and 2% than the control.4.Internal sprouting index increased rapidly when the garlic bulb was put at room temperature after cold temperature storage, it got a higher growth rate and excessed 0.5 at the end of the 6th day. Internal sprouting index of Russian garlic was more than that of Cangshan garlic. Both soluble sugar and soluble protein experienced a short cut in the first 6 days, and then got back into growing, and the soluble sugars and Pr content of Cangshan garlic was always higher than Russian garlic. MDA, free amino acid and allicin content increased with the passage of time.5.The dormancy of Cangshan garlic and Russian garlic can be broken in-advance by hot temperature treament.The bulbil began to growth in the 10th day after hot temperature treament. 42°C treament could first break dormancy of this two cultivars. 48°treament was a little later,but the bulbbil growth more quickly after dormancy releasing There was no obvious difference in the effect on breaking dormancy of Russian garlic by 37°C and 48°C.6.Endogenous hormones in garlic bulb decreased rapidly during the periods of hot temperature treament. Variation of ABA content was difference among different temperature treatment. Sensitivity of ABA change in Cangshan garlic was higher than that in Russian garlic.The level of ZR content positively correlated with bulbil growth rate.