In China, we all know that plants are easily affected by diseases during their growth. Diseases not only affect the yield and quality of plants, but also have an impact on the environment. In the growth of plants, photosynthesis is an important reference for judging the growth of plants. Chlorophyll content is an important material for photosynthesis in plants. Therefore, the use of chlorophyll meter to accurately determine the chlorophyll content has an effect on photosynthesis and even virus damage of eye plants. It's important. 1. Relationship between chlorophyll content and resistance to downy mildew Regarding the study on the relationship between chlorophyll content and disease resistance of plants against downy mildew, there are relatively many reports on cucumber, and the conclusion is very consistent. Gu Zhenfang et al. identified the resistance to downy mildew of 9 cucumber strains, and determined the chlorophyll content using a chlorophyll meter. The results showed that the content of chlorophyll in the leaves was positively correlated with the downy mildew resistance; the chlorophyll content might be inferred. High leaf photosynthetic capacity, high energy production, accumulation of organic matter, and increased resistance, so it is useful to judge disease resistance by comparing the shade changes of cucumber strains. . Similarly, Ai et al.'s study on the relationship between disease resistance and chlorophyll content of cucumbers showed that there was a positive correlation between chlorophyll content in leaves and resistance to downy mildew in cucumber. Liu Huining et al.'s study on grape downy mildew also showed that there is a very significant positive correlation between the chlorophyll content and the condition index of grape downy mildew. Jin Zhu et al found in the physiological basis of purslane against downy mildew that purslane was less resistant to downy mildew than Chinese cabbage, the rate of decline in chlorophyll content after sensibility, and slower purslane in purslane. 2. Relationship between chlorophyll content and disease resistance of powdery mildew The study on the relationship between chlorophyll content and disease resistance of plant powdery mildew is also very consistent. Xu Bingliang et al. carried out powdery mildew inoculation on leaves of 8 different resistant aphid varieties and measured chlorophyll content with a chlorophyll meter. It was found that there was no significant difference in chlorophyll content between different resistant varieties before inoculation, but after inoculation with powdery mildew There was a significant change in chlorophyll content among the susceptible cultivars. The chlorophyll content of the susceptible cultivars decreased significantly more than that of the resistant cultivars, and the chlorophyll content of the susceptible cultivars decreased significantly as the degree of morbidity increased. The same research on the relationship between the disease resistance and the chlorophyll content of cucumber showed that the resistance of cucumber to powdery mildew was positively correlated with the chlorophyll content in leaves. Chen Qicun’s identification of resistance to wheat powdery mildew also showed that the photosynthetic rate and chlorophyll content of wheat plants with different resistance to powdery mildew increased with increasing degree of resistance. Lin Xiaoping studied the effect of powdery mildew infection on the chlorophyll content in leaves of six aphid cultivars with different resistance to disease. The results showed that the difference in chlorophyll content between the susceptible cultivars before inoculation and the susceptible cultivars and disease resistant cultivars was not significant. There was a significant difference in chlorophyll content between the diseased cultivars, and the chlorophyll content decreased significantly with the extension of the inoculation time and the increase of the morbidity, indicating that the chlorophyll content in the leaves was closely related to the disease resistance of the plants. However, the quantitative relationship between chlorophyll content and disease resistance, and whether chlorophyll content can be used as one of the markers for resistance to powdery mildew, remains to be confirmed by further studies. 3. Relationship between chlorophyll content and disease resistance of several virus diseases Huang Xueyue etc. inoculated CMVs from wild tobacco in four tobacco varieties with different degrees of sensitivity, and then measured the chlorophyll content with a chlorophyll meter. It was found that CMV had different types of chloroplast pigments for different resistant varieties. The degree of influence is not the same, and their reduction increases as the resistance of the variety decreases. Wang Wei et al. also found that the formation of chlorophyll and carotenoids in tobacco leaves was strongly inhibited after inoculation with cucumber mosaic virus. It can be seen that the chlorophyll content is positively correlated with the resistance of tobacco cucumber mosaic virus, and can be considered as a reference in disease-resistant breeding. The study of Wencai et al. showed that after infecting the potato virus Y strain, the chlorophyll content of the tobacco was significantly reduced. Guo Xingqi et al. discussed the causes of the significant decrease in chlorophyll content in plants after virus infection. Two explanations are currently proposed: one is that the virus inactivates the chlorophyll decomposition enzyme to decompose chlorophyll; the other is considered to be the chloroplast lipid peroxidation and chlorophyll. There is a coupling mechanism in the decomposition, and virus infection causes tissue necrosis and further affects the biosynthesis of chloroplasts. Ai et al.'s study concluded that there is no correlation between chlorophyll content in leaves and fusarium wilt in cucumber. 4. Relationship between chlorophyll content and sugar beetroot resistance Rhizomania is an important disease of the sugar crop beet. Under the same conditions as the cultivation measures and the environment, etc., Wang Junbin et al. and Zhang Shaoying et al. determined that the resistant varieties of beet and disease-resistant cultivars in the field of disease-inhabiting and disease-free bacteria were determined to be pathogenic. In the field or in the field of disease-free bacteria, the chlorophyll content of resistant varieties was significantly higher than that of susceptible varieties. Cao Junmai and others also obtained the same research results, and believe that the difference in chlorophyll content can be used as an identification index for the breeding of resistance to Rhizomania. 5, the relationship between chlorophyll content and other disease resistance Cui Xiumin et al investigated the biological characteristics and incidence of melasma in 34 different non-heading Chinese cabbage varieties, and conducted principal component analysis and path analysis. The results showed that chlorophyll has a direct negative effect on the disease index. Large, that is, high chlorophyll content of the variety, the disease index is small, and disease resistance is strong. In soybean, Liu Yaguang et al used soybean cultivars with different resistance to C. sojae, and then determined the content of chlorophyll in the leaves after inoculation. The results showed that the ratio of chlorophyll a/b in leaves of disease-resistant cultivars was significantly higher than that of susceptible cultivars. It is preliminarily considered that the ratio of chlorophyll a/b can be used as a biochemical indicator for the resistance of soybean varieties to gray spot disease. In turfgrass, Chen Xi and others observed that there was a highly significant negative correlation between chlorophyll content and field incidence in non-pathogenic leaves. Leaf blight caused a significant decrease in chlorophyll content in turfgrass, but resistance to disease. The decrease in chlorophyll content of the varieties was lower than that of the susceptible varieties, indicating that the change in chlorophyll content is related to the disease resistance of turfgrass. However, Ai et al.'s study concluded that there is no correlation between chlorophyll content in leaves and Phytophthora infestans, and the results of Li Shuju et al. showed that the chlorophyll content had no obvious relationship with the disease resistance of cucumber against Scab. 6, increase the effect of chlorophyll content on plant disease resistance When Qi Guohui et al. studied the effects of arbuscular mycorrhizal fungi on the growth of Ginkgo biloba seedlings in heavy alum, it was found that regardless of whether the soil was disinfected or not, the three arbuscular mycorrhizal fungi in the soil increased the chlorophyll content of Ginkgo biloba and reduced leaf blight. The condition index. Shen Xihai’s increased use of titanium to increase the disease resistance of cucumbers is thought to be due to the increase in chlorophyll content, which provides adequate nutritional protection for plant growth, and at the same time enhances photosynthesis, accelerates physiological growth, and provides physiological basis for plant disease resistance. . Wang Rong et al. studied the effects of eliciting agents on some disease-resistance-related biochemicals in colored cotton. It was found that treatment with salicylic acid and other antagonism agents increased chlorophyll content and promoted photosynthesis, thus enhancing cotton's ability to withstand disease. Similarly, in the study of the effect of paclobutrazol on the heat resistance of tall fescue turfgrass, Shen Tuyueyue et al. observed that applying paclobutrazol to increase the chlorophyll content of leaves can enhance heat resistance and disease resistance, and increase their ability to overdrive. However, Mao Xiujie et al. studied the effects of paclobutrazol, chlormequat, and calcium treatment on the growth, development and resistance of muskmelon (Elizabeth) but found that the chlorophyll content in the seedling stage and fruit setting stage was not significantly related to Fusarium wilt. 7. Summary and Outlook For more than a decade, China has made some progress in the research on the relationship between chlorophyll content and plant disease resistance. Existing studies have shown that the chlorophyll content in many plants is closely related to various plant disease resistances, but some plant resistances are not related to chlorophyll content in some diseases and some stages. However, the physiological and molecular mechanisms of the effects of chlorophyll content on plant disease resistance remain to be further revealed.
I:Summary
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