| Nanocellulose is a new generation of renewable nano biomaterials,with unique physical,chemical,and optical properties.It has the advantages of easy degradation,non-toxicity,and cheap availability,and has great application potential.The unique characteristics of nanocellulose have led to its application in many industrial fields,including coatings,catalysis,cosmetics,biosensors,drug delivery,and medical devices.In recent years,scientists have conducted various explorations and experiments on the application of nano cellulose in agriculture.Previous studies have shown that spraying nano cellulose can reduce the damage of low temperature to crop reproductive buds,and nano cellulose composite films have a preservative effect on fruits.However,the effect of nano cellulose on peach blossom and fruit resistance to low temperature and freezing damage;Whether nanocellulose film can replace bagging on the quality of peach fruit;The effect of single nanocellulose on postharvest storage of peach fruit has not been studied.Therefore,this experiment used 5 year old’Zhongpan 101’ as the test material to study the effect of nanocellulose(CK1: control without low temperature stress,CK2: control under low temperature stress,T1: spray concentration of0.06% nanocellulose,T2: spray concentration of 0.1% nanocellulose,T3: spray concentration of 0.2% nanocellulose)on the damage of peach fruit jelly.To explore whether nanocellulose can replace bagging and how it affects the quality of peach fruit,’Luhong 618’ peach and’Jinxia Youpan’ peach were used as test materials,The effects of nanocellulose(CK1: bagging control,CK2: non bagging control,N1: spraying 0.1% nanocellulose before bagging,N2:spraying 0.06% nanocellulose,N3: spraying 0.1% nanocellulose,N4: spraying 0.2%nanocellulose)on fruit appearance quality and intrinsic quality such as hardness,soluble solids,titratable acid,solid acid ratio,and total phenolic flavonoids were studied.In addition,using ’Ruipan 21’ as the test material,the effects of nanocellulose(CK: control,CNC: 0.2%nanocellulose,CS: 0.1% chitosan,CNC/CS: 0.2% nanocellulose and 0.1% chitosan mixed in a 7:3 ratio)on the quality of peach fruit after harvest were studied in order to provide a theoretical basis for the use of nanocellulose in peach trees.The main test results are as follows:1.Under low temperature stress,the relative electrical conductivity,malondialdehyde content,protective enzyme activity,and proline content of peach blossoms and fruits significantly increased,while the soluble sugar and soluble protein content significantly decreased.Compared with CK2,the relative electrical conductivity of T1,T2,and T3 peach blossoms treated with nanocellulose under low temperature stress decreased by 19.4%,28.38%,and 17.7%,respectively,with a significant difference,among which T2 had the best effect;The relative electrical conductivity of young fruits of T1,T2,and T3 peaches decreased by 36.3%,46.0%,and 62.1%,respectively,with significant differences,among which T3 had the best effect.Compared with CK2,the content of malondialdehyde in the ovary of T1,T2,and T3 peach flowers decreased by 15.0%,38.7%,and 31.0%,respectively;The content of malondialdehyde in young peach fruits decreased by 11.2%,20.9%,and 27.0%,respectively;However,the soluble sugar,soluble protein,and protective enzyme activities(CAT,POD,SOD)in the ovary of peach blossoms under different treatments were significantly increased.Compared with CK2,the proline content in peach blossoms of T1,T2,and T3 increased by 17.3%,28.7%,and 21.6%,respectively;The proline content in young peach fruits increased by 5.1%,13.9%,and 18.5%,respectively,with significant differences.2.Compared with CK1,N1 treatment significantly increased fruit hardness,solid acid ratio,soluble starch content,and fruit brightness,while cellulase activity,pectinase activity,and weight loss rate significantly decreased.The fruit firmness,solid acid ratio,soluble starch content,and fruit brightness of Maotao increased by 18.4%,6.7%,17.1%,and 2.0%,respectively;The activities of cellulase and pectinase in peach decreased by 5.3% and 29.4%,respectively.Compared with CK1,the hardness,solid acid ratio,total phenols,flavonoids,and soluble starch of N1 treated oil flat peach increased by 2.8%,14.0%,22.2%,19.9%,and9.9%,respectively;The cellulase and pectinase activities of Youpan peach decreased by 9.0%and 27.7%,respectively.Compared with CK2,treatment with N2,N3,and N4 can improve the quality of peach fruit,and treatment with N4 has the best effect.The fruit hardness,solid acid ratio,soluble starch content,total phenols,flavonoids,and fruit brightness of peach treated with N4 increased by 10.8%,12.1%,47.5%,30.5%,22.4%,and 11.5%,respectively;The cellulase activity and pectinase activity decreased by 33.0% and 39.1%,respectively;The hardness,solid acid ratio,total phenols,flavonoids,and soluble starch of oil flat peach treated with N4 increased by 9.1%,28.0%,29.0%,20.4%,and 29.2%,respectively;The cellulase activity and pectinase activity decreased by 33.0% and 39.1%,respectively,with significant differences.3.Compared with CK,CNC treatment,CS treatment,and CNC/CS treatment can improve the postharvest storage quality of peaches.In terms of weight loss and hardness changes during fruit storage,CNC treatment has the best effect,and in terms of soluble solids and appearance quality changes during fruit storage,CNC/CS treatment has the best effect.Compared with CK,the activities of glutathione reductase and ascorbic acid peroxidase in each treatment were significantly increased;The activities of lipoxygenase and polyphenol oxidase were significantly decreased,and there was no significant difference between glutathione reductase activity treatments;The treatment with CNC/CS had the best effect on ascorbic acid peroxidase activity,increasing by 36.7%.Compared with CK,the treatment with CNC decreased lipoxygenase activity by 73.0%;The polyphenol oxidase activity decreased by 47.0%,with a significant difference. |
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