Evaluation Of Fennel To Induce Seed Germination Of Broomrape

Broomrape(Orobanche spp.)is a kind of root parasitic weed,which seriously affects the growth and production of crops,and even leads to crop failure.The control measures of broomrape have been constantly explored.In the current control methods of broomrape,mainly use "trapping crops" to control broomrape.By inducing broomrape's "suicide" germination,reducing the soil seed bank of broomrape,and realizing the green control of broomrape,it has potential exploration and application value,and has attracted the attention of researchers.Xinjiang is one of the areas with the most serious damage to broomrape in China,which will lead to crop failure.In Yanqi reclamation area of the second division of Xinjiang,Xinjiang Construction Corps adopts corn interplanting with cumin to improve economic income and prevent broomrape.At present,there is still no scientific demonstration on the effect and mechanism of this interplanting mode on different kinds of broomrape,so further experimental research is needed?In this study,sunflower broomrape and Egyptian broomrape plants were selected as the control objects,and fennel and corn were used as the experimental materials to explore the germination effect of fennel through indoor hydroponics experiment.The experiment of outdoor potting was used to verify whether fennel could be listed as parasitism and the best period of parasitism.At the same time,the preliminary mechanism of controlling and eliminating listed fennel in maize interplanting was revealed by microsection technology.The main conclusions are as follows:(1)Different organs of fennel can stimulate the germination of sunflower broomrape and Egyptian broomrape.The effect of different organs on the germination of sunflower broomrape seeds was as follows: root > aboveground > root exudates.The root methanol extract had the strongest stimulating effect on the germination of sunflower broomrape seeds in the growth period of 6 weeks(G6),and the root methanol extract had the strongest stimulating effect on the germination of sunflower seeds in the growth period of 2 weeks(G2).The germination rate of sunflower seeds was 77.4%.Pot experiment further proved that organs had the ability of inducing germination to sunflower broomrape and Egyptian broomrape in different growth period,but fennel could be parasitized by Egyptian broomrape instead of sunflower.(2)Temperature significantly affected the germination and parasitism of fennel.The extraction solution of fennel increases with the increase of temperature to stimulate the germination of seeds of Egyptian broomrape,and the germination rate of seeds of Egyptian broomrape is the highest at 25 ?,reaching 60%-91%,but at 5 ?,the seeds of Egyptian broomrape do not germinate.At the same time,temperature significantly affected the parasitism of Egyptian broomrape.At 5 ?,fennel was not listed as parasite,and at 25 ?,the number of fennel was listed as parasite was 14 / plant.(3)The root exudates of different depths of fennel have the ability of inducing germination of broomrape,and the stimulation effect of different root segments on broomrape is not obvious.The results showed that the best stimulation effect of different root extracts was 40.1% for sunflower broomrape and 89.3% for Egyptian broomrape,but there was no significant difference between the different root extracts.(4)The degradation test showed that there were differences in the germination effect of rhizosphere soil treatment before and after rainfall,which proved that rainfall could dilute the concentration of stimulant substances in plant germination.Before rain,the stimulation effect of corn interplanting with fennel was strong,and the stimulation effect of sunflower broomrape and Egyptian broomrape were 36% and 58%,respectively.