| Mites infestation can cause loss of crops, often affecting the yield and quality of crops. There were numerous reports about the significant loss caused by mites in corn. Tetranychus cinnabarinus (Boisduval) is the dominant species on corn in Sichuan and mite control methods were mainly dependent on chemical pesticides. However, long-term use of pesticides will caused"3R"growing problem. Breeding mite-resistant varieties is a promote comprehensive management to control mite. Currently studies on anti-mite corn have reported rare, and the mostly study was primary filtrate the resistant materials.1 With 8 maize inbred lines covered with network, using the leave hazard index as an evaluation index, to evaluate the resistance of the 8 maize inbred lines. The result showed that the leave hazard index of H1014168, H1014591and H1019005 is 0.37, 0.81,0.73.2 The results of this study showed that the soluble protein in the corn was closely related with the resistant mechanism of corn to mite. The leaf hazard index was highly positively related to the soluble protein. Corn with higher mite resistance showed lower content of soluble protein. The contents of soluble protein possess high diversity, and the variation was significant. The contents of the susceptible materials were higher than the resistant materials. Correlation analysis showed that there was a significant positive correlation between the soluble protein content of corn and leaf hazard index, and the coefficient was 0.7100. The linear regression equation was y= 0.082x+0.324, F= 6.10 (Fo.os (1,6)= 5.99). The results of regression analysis revealed that the resistant mechanism of corn was related to the lysine, serine and glycine before inoculation; and the resistant mechanism of corn was related to the threonine, Isoleucine, leucine, lysine after seven days of inoculation; and the resistant mechanism of corn was related to the Aspartate, Glutamate, threonine, alanine, valine after 14 days of inoculation. The soluble sugar has no correlations with the anti-mite properties of corn.3 The analysis showed that the content of Flavonoids was highly negatively related to the leaf hazard index, indicating that the flavonoids play a greater role in the resistant mechanism of corn to mite. The Flavonoids play a role in the constitutive resistance of corn. Correlation analysis showed that there was a significant negative correlation between the flavonoids content of corn and leaf hazard index, and the coefficient is-0.7407. The linear regression equation was y=-1.276x+1.259, F=7.30 (F0.05(1, 6)=5.99).The MDA play a role in induced resistance of corn. Experimental data showed that the content of MDA was decreased after increasing, and the content of MDA was increased after infecting with mite. The increase rate of MDA from the susceptible materials was higher than the resistant materials. The increase rate of MDA after 7 days of infection was highly positively related to the leaf hazard index. Correlation analysis showed that there was a significant positive correlation between the increase rate of MDA and leaf hazard index, and the coefficient was 0.8356. The linear regression equation was y= 27.41x+0.457, F=13.88 (F0.05(1,6)=5.99).The increase rate of DIMBOA was highly positively related to the leaf hazard index, indicating that the DIMBOA play a role in induced resistance of corn. Correlation analysis showed that there was a significant negative correlation between the increase rate of DIMBOA and leaf hazard index, and the coefficient was -0.7574. The linear regression equation was y=-0.021x+0.703, F=8.07 (F0.05(1,6)=5.99).But there is no significant correlation in Phenolic, Anthocyanin, and Tannin with the leaf hazard index, and they have no correlations with the anti-mite properties of corn. |
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