| Identification of soil allelochemicals and autotoxicity of Lilium davidii var. unicolor salisb in different continuous cropping years |
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| DOI：10.7606/j.issn.1000-7601.2021.02.09 |
| Key Words: Lilium davidii var. unicolor salisb rhizosphere soil continuous cropping allelochemicals autotoxicity |
| Author Name | Affiliation | | HUANG Yufang | Gansu University of Traditional Chinese Medicine, Gansu, Lanzhou 730000, China | | ZHANG Enhe | Agronomy College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Xinhui | College of Pharmacy, Ningxia Medical University, Yinchuan, Ningxia 750004, China | | CAO Rui | Gansu University of Traditional Chinese Medicine, Gansu, Lanzhou 730000, China | | XIE Tianpeng | Gansu University of Traditional Chinese Medicine, Gansu, Lanzhou 730000, China | | CHEN Honggang | Gansu University of Traditional Chinese Medicine, Gansu, Lanzhou 730000, China | | GAO Sufang | Gansu University of Traditional Chinese Medicine, Gansu, Lanzhou 730000, China |
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| Abstract: |
| The rhizosphere soils were collected under field conditions in the stubble, continuous cropping for 2 years and continuous cropping for 4 years of Lanzhou lily (Lilium davidii var. unicolor salisb) to explore the possible obstacle mechanisms of continuous cropping of Lanzhou lily. The rhizosphere soils were collected at the vigorous growth stage and harvest stage, respectively. The chemical composition in different soils were determined by a GC-MS, and the effect of typical autotoxic substances on the growth of Lanzhou lily seedlings were tested by biological experiments. The results showed that eleven, fifteen, and nineteen compounds were identified in the rhizosphere soil from the first crop, continuous cropping for 2 years, and continuous cropping for 4 years of Lanzhou lily at the vigorous growth stage, and nine, fifteen, and seventeen compounds were identified in the rhizosphere soil from the above three treatments at harvest stage, including alcohols, aldehydes, esters, phenolic acids, and small amounts of terpenoids. Among them, dioctyl terephthalate (D) was present in continuous cropping soil at different growth stages, and antioxidant 2246 (A) was also present in other soils except normal cropping soil at harvest stage, and the relative contents of both were higher. The results of biological experiments showed that at 0.2 mg·mL-1, the synthesis effect of dioctyl terephthalate (D0.2) on the growth of Lanzhou lily seedlings was -0.003, showing inhibitory effect. The SE value of antioxidant 2246 (A0.2) was 0.131, showing promoting effect. At the concentration of 5.0 mg·mL-1, both dioctyl terephthalate (D5) and antioxidant 2246 (A5) could inhibit the growth of Lanzhou lily seedlings, with SE values of -0.489 and -0.040, respectively. The inhibition effect of dioctyl terephthalate was stronger. A cross mixture of 0.2 mg·mL-1 and 5.0 mg·mL-1 dioctyl terephthalate and antioxidant 2246 was prepared and the effect of the two-component mixture on Lanzhou lily seedlings was studied. The results showed that the mixture of D0.2A5 and D5A5 still inhibited the growth of Lanzhou lily seedlings under the combined conditions, but did not reflect the synergistic effect of inhibition when the two components were applied alone. The D5A0.2 mixture showed an inhibitory effect, and D0.2A0.2 showed a promoting effect, reflecting the superposition effect of the opposite effect of the two components alone. |
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