Induction of POD activity in cucumber by oxalate
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Oxalate had no direct effects on the POD activity, but it could induce the increment of the POD activity in the local leaves and in the systemic leaves of cucumber seedlings. The increment of POD activity in the different parts of cucumber is related to the form of POD and the time after treatment .Cite
The effects of exogenous salicylic acid treatments on water content, pigment content, electrolyte leakage, activities of SOD, POD, CAT in leaves and electrolyte leakage, activities of SOD, POD, CAT in roots of kidney bean seedlings under water stress were studied. Results showed that exogenous salicylic acid could alleviatethe decline of water content and pigment content of leaves, and maintain the activities of SOD, CAT in leaves and SOD, POD, CAT in roots. However, it increased the electrolyte leakage of leaves and roots, and decreased the activity of POD in leaves. These indicated that salicylic acid could alleviate the injury of water stress on kidney bean seedlings.
Water Stress
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The activities of POD、SOD or CAT and H2O2 content were examined in cucumber leaves treated with oxalic acid or inoculated with Pseudoperonospora cubensis f.sp.cucumerinum.Results showed H2O2 content in leaves treated with oxalic acid were increased significantly,and accumulated faster than control after inoculation of Pseudoperonospora cubensis f.sp.cucumerinum.After leaf treated with oxalic acid,the activities of SOD or POD were enhanced while CAT activities were inhibited in leaves.The results showed that H2O2 may be concerned with induced resistance against downy mildew.The increase of H2O2 content may be related to the increase of SOD or POD activities and the decrease of CAT activities.That oxalic acid induced defense gene expression through H2O2 was one of the main mechanism of induced resistance.
Pseudoperonospora cubensis
Oxalic Acid
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The cucumber was used as the material to study its physiological reaction under the low potassium stress.The results showed that the cucumber growth decreased and the chlorosis appeared;the activities of SOD and APX increased,while those of CAT and POD decreased;the MDA content increased with the decreasing of potassium compared with the normal potassium treatment.
APX
Chlorosis
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The experiment conducted with spraying 5-aminolevulinic acid(ALA) to cucumber(Cucumis sativus L.) seedlings of 3 varieties('h02','h082'and'Chuanlv No.1')in 2 true leaves stage,then with shading treatment.The study set 5 concentrations.They were 0 mg·L-1(CK),0.01 mg·L-1,0.1 mg·L-1,1 mg·L-1,10 mg·L-1,50 mg·L-1,respectively.After ALA spraying for 0 day,2 days,6 days,10 days,14 days on cucumber seedlings,leaf protect enzymes and MDA content were determined,and the growth situation of cucumber seedlings were recorded.Results showed that the application of low concentration of shading when ALA processing cucumber seedlings,can promote plant height,increase leaf area and stem diameter,improve SOD and POD activities and reduce the MDA accumulation.When ALA reaches a certain concentration,its promoting function is the strongest.Then with the concentration increases,its promotion effect weakens.This indicates that ALA can improve cucumber seedlings tolerance to weak light,and 1 mg·L-1 ALA treatment has the best effect.
Cucumis
Shading
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In order to study influence of chitosan on heat tolerance of the cucumber seedlings, chitosan at 0(CK)、50、75 and 100 mg/L was sprayed on cucumber seedlings on one leaves stage respectively, and the cucumber seedlings were stressed under high temperature at 45℃ in daytime while 40℃,in night for 4 d, and the seedlings were sprayed every 24 h. Results showed that chitosan could increase the activity of superoxide dismutase(SOD), peroxidase(POD), catalase(CAT) as well as ascorbic acid peroxidase (APX), decrease O-2production rate. The study indicated that chitosan at proper concentrations was capable of improving the ability to eliminate reactive oxygen species, reducing cell peroxidation and membrane permeability, protecting the functions of bio-membrane, raising the heat tolerance of cucumber seedlings.
Cucumis
APX
Membrane permeability
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In this study,cucumber seedlings were cultivated in nutrient solution added with different concentration(0,0.5,1,1.5,2 mmol·L-1) Na2SiO3 as Si donor to study the effects of exogenous Si on the growth of cucumber seedlings and the activities of antioxidant enzymes in cucumber leaves under NO-3 stress.Under the stress of 140mmol·L-1,treating with 1mmol·L-1 of Na2SiO3 for 7d increased the leaf superoxidase(SOD),peroxidase(POD),catalase(CAT) and ascorbic acid peroxidase(APX) activities,and decreased the leaf malondialdehyde(MDA) content significantly,suggesting that exogenous Si could enhance the capacity of cucumber seedlings in scavenging active oxygen species,protect the seedlings from the peroxidation of membrane lipids,and promote the seedlings growth and increase resistance to high concentration NO-3 stress.After the cucumber seedlings grew in 2 mmol·L-1 of Na2SiO3 for 7d,the activities of SOD,POD,CAT and APX in leaves were decreased,and the MDA content was increased,resulting in the injury of cucumber seedlings.It indicates that certain concentration(0.5～1 mmol·L-1) exogenous Si could alleviate the NO-3 stress to cucumber seedlings.
APX
Malondialdehyde
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Ahydroponic experiment was conducted to study the effects of brassinolide(BR)on the growth and isozyme expression of antioxidant enzymes of cucumber seedling under calcium nitrate stress.These results showed the growth of cucumber seedlings were significantly inhibited while BR alleviated the growth inhibition in cucumber seedling which induced by calcium nitrate with increasing more fresh weight and dry weight after 9 days calcium nitrate stress and calcium nitrate induced the expression of superoxide dismutase(SOD),catalase(CAT)and peroxidase(POD).However,BR increased the expression of SOD and POD isozymes by 14.77 % and 17.49% on the day 6 and decreased the expression of POD by 16.59% on the day 9.Our results suggested that calcium nitrate stress inhibited the growth of cucumber seedling and BR might regulate the isozyme expression of antioxidant enzymes of cucumber seedling and alleviated the damage effects of calcium nitrate stress to cucumber seedling.
Brassinolide
Calcium nitrate
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In this study, cucumber seedlings were cultivated in nutrient solution added with different concentration (0.05, 0.1, 0.2, and 0.3 mmol x L(-1)) sodium nitroprusside (SNP) as nitric oxide (NO) donor to study the effects of exogenous NO on the growth of cucumber seedlings and the activities of antioxidant enzymes in cucumber leaves under NO3- stress. Under the stress of 140 mmol x L(-1) NO3-, treating with 0.1 mmol x L(-1) of SNP for 1 d or 7 d increased the leaf soluble protein content and superoxidase (SOD), catalase (CAT), and ascorbic acid peroxidase (APX) activities, and decreased the leaf malondialdehyde (MDA) content significantly, suggesting that exogenous NO could enhance the capacity of cucumber seedlings in scavenging active oxygen species, protect the seedlings from the peroxidation of membrane lipids, and promote the seedlings growth and increase their resistance to high concentration NO3- stress. After the cucumber seedlings grew in 0.3 mmol x L(-1) of SNP for 7 d, the activities of leaf SOD, POD, and CAT decreased, and the MDA content increased, resulting in the injury of cucumber seedlings. It was indicated that certain concentration (0.1-0.2 mmol x L(-1)) exogenous NO could alleviate the NO3- stress to cucumber seedlings.
APX
Malondialdehyde
Sodium nitroprusside
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With the solution culture method,studied the different density Nickel to sprout and under the cucumber to the cucumber seed the hypocotyl hyperoxide enzyme(SOD),peroxide enzyme(POD),Catalase(CAT) activeness and malon dioaldehyde(MDA) content influence.The results indicated that,Density in 0.05 mg/L,0.1 mg/When L,is not big to the cucumber seed's germination percentage and the germination tendency influence,but along with the density increase,the Nickel forces to cucumber's germination percentage and the germination tendency has the inhibitory action,also strengthens along with the density increase this kind of inhibitory action.Low density processing,under the cucumber hypocotyl SOD,the CAT activeness has the increase,but along with the density increase,its activeness drops,but under the cucumber the hypocotyl POD activeness and the MDA content but increases along with the processing density increase.
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This article focused on the cucumber resistance to Cladosporium cueumerinum which was induced by chito-oligosaccharide.The state of illness of the cucumber seedlings induced by 6 mg/mL chito-oligosaccharide was investigated and the activities of major defense enzymes of phenylalanin ammo-nialyase(PAL),peroxidase(POD),polyphenol oxidase(PPO),superoxide dismutase(SOD),and catalase(CAT) were determined.The results showed that the induced resistance of cucumber scab by chito-oligosaccharide was 60.25% and 47.59% in 10 d and 17 d,respectively.The activity of PAL increased obviously and POD,PPO,SOD also increased partly,but chito-oligosaccharide had no effect on CAT.These researches suggested that resistance to cucumber C.cueumerinum induced by chito-oligosaccharide would be helpful in using chito-oligosaccharide as a new biological pesticide.
Oligosaccharide
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