連作甜瓜土壤中酚酸類物質(zhì)的變化規(guī)律和木霉菌降解作用研究
[Abstract]:Melon (Cucumis sativus L.) Also known as cantaloupe, is an important cash crop in Northeast China. In recent years, muskmelon has developed rapidly in Northeast China. The root exudates of muskmelon and the residue decomposition of plant diseases are one of the important reasons of crop continuous cropping obstacle. In this paper, the phenolic acids in muskmelon continuous cropping soil were detected by high performance liquid chromatography (HPLC), and the composition and variation of phenolic acids in muskmelon continuous cropping soil were determined. In addition, the dominant Trichoderma species were selected from the soil of muskmelon to degrade phenolic acids, which provided scientific basis for alleviating the obstacle of continuous cropping of muskmelon. 1. High performance liquid chromatography (HPLC) was used to analyze and identify the phenolic acid species and their contents in the soil of cantaloupe. The results showed that the contents of p-hydroxybenzoic acid, vanillic acid, eugenic acid, vanillin, coumaric acid, ferulic acid and benzoic acid increased with the increase of continuous cropping time, but the content of cinnamic acid decreased gradually. After 4 years of continuous cropping, the total amount of 8 phenolic acids reached 257.94 mg kg-1 dry soil, which was significantly higher than that of non-continuous cropping soil. With the increase of planting years of simulated continuous cropping in pot plant, soil-borne diseases such as melon wilt occurred seriously, plant growth was inhibited, fruit yield decreased obviously, and continuous cropping obstacles became more and more serious. In addition, the soil samples of muskmelon in three provinces of Northeast China were analyzed and identified. The contents of 6 phenolic acids, such as p-hydroxybenzoic acid and vanillic acid, were significantly different. 2. The dominant Trichoderma species in continuous cropping soil of muskmelon in Northeast China were selected. In this experiment, 124 muskmelon continuous cropping soils were collected, 66 strains of Trichoderma strains were screened, accounting for 53.23% of the total, 31 strains of Trichoderma strains were isolated in Heilongjiang region, the number and frequency of isolation were higher than those in Jilin and Liaoning regions. TQTH-03 and TSY-02 dominant Trichoderma strains were screened from SA medium containing root exudates of muskmelon. The degradation system of phenolic acid in muskmelon continuous cropping soil was established, and the degradation effect of Trichoderma on the main phenolic acid in muskmelon continuous cropping soil was determined. The degradation of phenolic acids in muskmelon rhizosphere soil by Trichoderma (T4T23T23TQTH-03 TSY-02) was determined by three different inoculation methods with exogenous spore suspension, PD suspension and wheat bran fermentation. The results showed that Trichoderma could effectively degrade the phenolic acid accumulated in soil, and the degradation rate of wheat bran fermentation could reach more than 25%, and the degradation effect was the most remarkable. Soil samples were degraded by Trichoderma (T4T23T23TQTH-03TSY-02) inorganic salt fermentation broth and PD fermentation broth. The results showed that the degradation rate of the main phenolic acids in muskmelon was above 20%, and the degradation effect was remarkable. Trichoderma (T4T23TQTH-03TSY-02) inorganic salt spore suspension solution was used to degrade the main eight phenolic acids in muskmelon soil. The quantitative analysis showed that Trichoderma had a good degradation effect, and the degradation ability of Trichoderma was low at high concentration. The degradation rate is high at low concentration. 4. 4. The field experiments were carried out with Trichoderma and bio-fertilizer as cultivation substrates to provide a theoretical basis for solving the problems of continuous cropping of muskmelon. The results showed that the incidence of muskmelon treated with Trichoderma was lower than that of the control, which was beneficial to enhance the growth and disease resistance of muskmelon plants and alleviate the continuous cropping obstacle.
【學(xué)位授予單位】:沈陽農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:S652;S153
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