Study On The Changes Of Seed Quality Of Storage And Discoloration Of Idesia Polycarpa Maxim

This study will research on the changes of seed quality of storage and discoloration of Idesia polycarpa Maxim.The Black fruit and red fruit of I.policarpa Maxim from Guangyuan Sichuan provenance harvested the same year and red fruit stored for one year were used as experimental materials.First,comparison of sown quality and oil quality between the fruit harvested in the same year and the fruit stored for one year and then measured the effects of different storage methods(dry storage at 25 ℃,dry storage at5 ℃,wet storage at 25 ℃ and wet storage at 5 ℃)on the activities of antioxidase activity,nutrients and membrane lipid peroxidation products in the seeds of black fruit and red fruit harvested in the same year,The main results were as follows:(1)The change of seed quality was different between storage and discoloration.With the increase of the days of low temperature at 5 ℃,the germination percentage of the seeds increased at 15 ℃ and 25 ℃.When the days of low temperature at 5 ℃ increased to 60 days,the germination percentage began to decrease at the temperature of 15 ℃ and 25 ℃.The germination rate of red fruit seeds stored one year at 5 ℃ for 60 days was the highest(55 %)at 15 ℃ /25 ℃,and the germination percentage of red fruit seeds harvested at 5 ℃ for 60 days at variable temperature for 60 days was the highest(82 %)at 15 ℃/25 ℃,and the germination rate of red fruit seeds harvested at 5 ℃ for 60 days was the highest at 15 ℃/25 ℃.The black fruit seeds harvested in the same year were treated at 5 ℃ for 40 days and changed.The germination rate was the highest at 15 ℃ /25 ℃,reaching 93%.The germination rate of red fruit seeds stored for one year was significantly different from that of fruit harvested in the same year,and the germination rate of red fruit seeds of the same year was significantly different from that of black fruit seeds of the same year.(2)The oil quality of seed flesh was different between storage and discoloration.The oil content of the red fruit seeds stored for one year,the red fruit flesh harvested in the same year,the black fruit flesh harvested in the same year and the black fruit seeds harvested in the same year from the highest to the lowest were in the order of 39.42 %,35.20 %,31.78 %,29.44 % and 22.61 %,respectively,with significant differences.The relative contents of oleic acid in red and black flesh harvested in the same year were 5.18% and 6.33%,respectively,with significant difference.The relative contents of linoleic acid,palmitic acid,stearic acid and myristic acid were not significant.The relative contents of oleic acid in red fruit seeds and black fruit seeds were 8.71 % and 6.24 %,respectively.There was no significant in the relative contents of linoleic acid,palmitic acid,stearic acid and myristic acid.The relative content of oleic acid in red fruit seeds harvested in the same year and stored in one year was8.71 % and 5.78 %,respectively,with significant difference.The relative contents of linoleic acid of red fruit seeds harvested in the same year and stored for one year were 79.15 % and80.74 %,respectively.There was no significant in Palmitic acid,stearic acid and meatbean myristic acid.(3)Under different storage methods,the activities of SOD and POD in the seedof black fruit and red fruit decreased with the increase of storage time,showed a fluctuating trend with the increase of storage time.The activity of CAT showed an increasing-decreasing-rising trend,and the change of soluble sugar content tended to be stable gradually,and the soluble protein fluctuated(except for the wet storage of red fruit at25 ℃)MDA fluctuated first and then decreased.Under the conditions of dry storage at25 ℃ and dry storage at 5 ℃,the activity of SOD and CAT was higher,the activity of POD was lower,and the content of soluble protein was increased.The activity of CAT and POD in dry storage at 5 ℃ was lower than that in dry storage at 25 ℃,and the activity of CAT and POD in black fruit seeds was lower than that in red fruit seeds in dry storage at 5 ℃.The content of soluble sugar in black fruit seeds was lower than that in red fruits seeds.The activities of CAT and POD in dry storage at 5 ℃ were lower than those in red fruits.Under the conditions of wet storage at 25 ℃ and wet storage at 5 ℃,the activities of SOD,CAT,POD,soluble sugar and MDA in dry storage at 25 ℃ and 5 ℃ were lower than those in dry storage at 25 ℃ and 5 ℃ with the increase of storage time.The content of protein was higher in dry storage at 25 ℃ and dry storage at 5 ℃.Of which,SOD and POD Under the condition of 5 ℃ wet storage,the activity of POD in black fruit seed was lower than that in red fruit seed,and the soluble sugar content in black fruit was higher than that in red fruit,and the content of soluble sugar in black fruit was higher than that in red fruit under 5 ℃ wet storage.The soluble protein content of black fruit seeds decreased after stored for 60 days,and the soluble protein content of red fruit seeds increased significantly after stored for 40 days.The results indicated that the minimum degree of seed deterioration in dry storage at5 ℃ was the suitable storage condition,and the increase of soluble protein content in wet storage at 5 ℃ provided material conditions for seed germination.The seed quality of red fruit stored for one year decreased under the condition of dry storage at room temperature.The seed quality of black fruit harvested in that year was higher than that of red fruit harvested in that year,but the quality of oil was lower than that of red fruit harvested in that year.This study revealed the change of seed quality during seed storage,provided scientific basis for safe storage,provided reference for harvest time and fruit color,and had certain theoretical practical value.