| Nicosulfuron has been extensively used in corn production as a post-emergence herbicide,but millet,a gramineous crop that is also a C4 plant,is more sensitive to nicosulfuron.In this article,a pot experiment was used to study the effects of five various concentrations of nicosulfuron on the morphological indicators,detoxification pathways,and target enzyme activities of millet(Zhangza 10,Jingu 21)and corn(Nongda108,Di Tian 8).To clarify the mechanism of the variation in the consciousness of millet and corn to nicosulfuron from the physiological,biochemical,and molecular perspectives.The principal is list in the following paragraphs:1.Except for 7.5 g/hm2,when the dose of nicosulfuron is within 15 g/hm2 and 60 g/hm2,Zhangza No.10 and Jingu No.21 nicosulfuron have been used as post-emergence herbicides in corn production.It is generally used,however,millet,a gramineous crop that is additionally a C4 plant.It is more sensitive to nicosulfuron.In this article,a pot experiment was used to study five different concentrations of nicosulfuron on the morphological indicators,detoxification pathways,and detoxification methods of millet(Zhangza 10,Jingu 21)and corn(Nongda 108,Ditian 8)plant height,leaf area,SPAD value,net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr),intercellular CO2 concentration(Ci),the maximum photochemical yield of leaves(Fv/ Fm),concrete photochemical efficiency(Y(II)),photochemical quenching coefficient(q P)and non-photochemical quenching coefficient(NPQ)were significantly lower than the control at 7 d and 15 d after treatment.The nicosulfuron developed.Between15 g/hm2 and 120 g/hm2,the plant height,leaf area,SPAD value,Pn,Gs,Tr,Ci,Fv/Fm,Y(II),q P,NPQ are not significantly various from the control.2.The SOD,POD,and CAT exercises of Nongda 108 were higher than those of Zhangza 10,Jingu 21,Ditian 8 at 1 d,3 d,5 d,and 7 d after treatment.The developing trend of malondialdehyde(MDA)content is the reverse.3.Under nicosulfuron stress,the ALS,GST,and CYP450 catalyst enterprises of Nongda 108 were higher than those of Zhangza 10,Jingu 21,Ditian 8.Associated with the control,the ALS and GST genes of Nongda 108 were significantly up regulated.while the ALS and GST genes of Zhangza 10,Jingu 21,and Ditian 8 were downregulated.4.The yield dissolution of Zhangza 10,Jingu 21,and Ditian 8 at the dose of nicosulfuron between 15g/hm2 and 60 g/hm2 all developed with the improvement in the nicosulfuron.There was no meaningful change in the yield of Nongda 108 between 15 g/hm2 and 120 g/hm2 procedures.Result: The resistance of millet to nicosulfuron is weaker than that of maize,and there are differences among varieties.The resistance level is Nongda 108>Ditian 8>Zhangza 10>Jingu 21.Part of the reason is nicosulfuron.Long significantly diminished the chlorophyll content in the leaves of sensitive varieties.Although it raised the heat distribution of light energy,the construction of Photosystem II was still greatly damaged,which led to the dissolution of photosynthetic capacity.The electron transportation exercise was diminished,following in nicosulfuron as a first.This kind of toxic factor causes the constant improvement of oxidative stress in plants and inhibits the activities of antioxidant enzymes SOD,POD and CAT through the same electron transport pathway;the activities of the target enzyme ALS and the non-target enzyme GST are inhibited.However,following the stress of nicosulfuron,the CYP450 enzyme activity of millet and maize showed an upward trend,registering that CYP450 plays an essential role in the detoxification of nicosulfuron. |
