| Effects of exogenous substance pretreatment on root rot resistance and physiological characteristics of continuous cropping Codonopsis pilosula |
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| DOI：10.7606/j.issn.1000-7601.2025.05.23 |
| Key Words: Codonopsis pilosula root rotdisease exogenous regulation bacteriostatic rate physiological characteristics |
| Author Name | Affiliation | | HU Yurong | College of Agronomy, Gansu Agricultural A&F University, Lanzhou, Gansu 730070, China
State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | QIU Daiyu | College of Agronomy, Gansu Agricultural A&F University, Lanzhou, Gansu 730070, China | | MA Lan | College of Agronomy, Gansu Agricultural A&F University, Lanzhou, Gansu 730070, China
State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | CHEN Xianxian | College of Agronomy, Gansu Agricultural A&F University, Lanzhou, Gansu 730070, China
State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | XU Fengbin | College of Agronomy, Gansu Agricultural A&F University, Lanzhou, Gansu 730070, China
State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to explore the mechanism of three exogenous substances to alleviate the root rot of Codonopsis pilosula, potted annual C.pilosula seedlings were used as materials in this study. Blank control (CK1), pathogen infection (CK2), 28-homobrassinolide root irrigation (T1), and leaf spray (T2), Bacillus subtilis (J1), and Bacillus amyloliquebilis (J2) were inoculated, and amino acid water\|soluble fertilizer spraying (Fa) treatments were set up. The pathogenic bacteria were inoculated 30 days later, and the inhibition rate of exogenous substances and the changes of physiological and biochemical indexes of leaves were measured. The results showed that J1 and J2 treatments significantly inhibited the growth of pathogenic infected nails, and the inhibition rate was over 70%. Compared with CK2, T1, T2, and Fa treatments significantly increased the contents of chlorophyll a (39.85%~81.52%) and chlorophyll b (68.94%~168.45%) and enhanced the activities of peroxidase (POD) (81.33%~95.33%) and catalase (CAT) (8.91%~39.36%), while effectively reducing cell membrane damage and lipid peroxidation. J1 and J2 treatments significantly reduced the activities of superoxide dismutase (SOD) by 16.85% and 13.76%, malondialdehyde (MDA) by 47.83% and 50.44%, proline by 20.55% and 18.23%, soluble sugar by 35.82% and 35.01%, and soluble protein by 35.46% and 35.21%, respectively, and these stress indexes returned to near\|normal levels. In conclusion, biocontrol bacteria can effectively inhibit the growth of pathogenic mycelium and spore germination. Growth regulators and amino acid water\|soluble fertilizers can balance the osmoregulatory system, enhance antioxidant defense mechanisms, promote photosynthesis, and enhance plant stress resistance, thereby alleviating diseases. |
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