The Influence Of Priming Two Cucumber Cultivar Seeds

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J. Duhok Univ. Vol.13, No.1, (Agri. And Vet. Sciences) Pp 139-147, 2010 (Nonenzymatic browning(NEB))development in samples was determined soluble brown pigments as( absorbance at 420 nm(A420)).Absorbance at 420 nm has generally been used by other resaerchers (Kacem et al.,1986;Klim and Nagy.,1988).Changes in A420 values for samples during four months of storage at 20,30 and 40 ° C are shown in table 1.The color samples exposed to light during four months study appeared darker significantly than unexposed.We observed an increase in browning as the storage temperature and time increased.This could in part be attributed to light transmission,especially ultra-violet light,which accelerates browning reactios.The results in the same table are apparent that samples which stored in plastic bottles contain more concentration of 941 browning pigments than samples stored in the glass bottles ,because plastic allows more oxygen permeation .Statistcal analysis showed that temperature and period time had significant effect(p
J. Duhok Univ. Vol.13, No.1, (Agri. And Vet. Sciences) Pp 139-147, 2010 A B C D Ln(AA) Ln(AA) Ln(AA) Ln(AA) 4 4 3 3 2 2 1 1 0 4 3 2 1 0 4 3 2 1 0 4 3 2 1 0 0 1 2 3 4 5 time(month) 0 1 2 3 4 5 Time(month) 0 1 2 3 4 5 Time(month) 0 1 2 3 4 5 Time(month) 20 c 30 c 40 c 20 c 30 c 40 c 20 c 30 c 40 c 20 C 30 C 40 C Fig. (3): The relation between Ln of ascorbic acid degradation and time:(A)glass in light.(B)glass in dark.(C)plastic in light.(D)plastic in dark. The rate constant(K)for ascorbic acid degradation were different at low and high temperatures for the same model system(table 2).The results indicated that the rate constant(K) of ascorbic acid loss was higher at elevated temperatures,because the rise in temperature, increases the reaction rate of ascorbic acid loss.Also the results in the same table indicated that the rate constant different with different packaging material(i.e 0.119 month -1 in glass bottles stored in light at 20 ° C and 0.176 month -1 in plastic bottles stored in the light at same temperature) because the plastic bottles has oxygen permeability which increase the degradation of ascorbic acid.Also we saw in the same table the half time t1/2(the time requisite to react half of initial concentration of substrate) of ascorbic acid loss decrease with increasing the temperature of storage,the results were 5.819,4.053 and 2.473 months for glass bottles ° in the light stored at 20,30 and 40 C respectively.The results in the same table indicated that the half time of the samples exposed to the light is lower than samples stored in dark(5.819 months for glass in the light stored at 20 ° C and 13.327 months for glass bottles in the dark stored at the same temperature).This results agree with other studies ( Zerdin et al. 2003) who found much better retention of ascorbic acid in stored orange juice at 4 ° C compared to those at 25 ° C. 943
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The Influence Of Priming Two Cucumber Cultivar Seeds

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