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最新文章
Early and Rapid Detection of Tomato Gray Mold Utilizing Loop-Mediated Isothermal Amplification (LAMP) Technology
摘要: [Objectives] To develop methods for the early and rapid detection of tomato gray mold. [Methods] Utilizing the ACTIN gene of Botrytis cinerea as the target, a set of specific primers for loop-mediated isothermal amplification (LAMP) was designed and screened. Subsequently, the reaction system and conditions were optimized to achieve rapid isothermal amplification of B. cinerea. [Results] Through agarose gel electrophoresis and SYBR Green I visualization analysis, the optimal dosages of Bst II DNA polymerase and dNTPs, as well as the optimal ratio of internal to external primers, were determined to be 0.6 U/μL, 1.25 mmol/L, and 2:1, respectively. The specific detection of B. cinerea was accomplished at 61 ℃ for 40 min, achieving a sensitivity of 100 ag/μL, which is 106 times greater than that of conventional PCR detection. When this method was applied to the detection of tomato diseases, the detection limit for B. cinerea spores reached 20 spores/mL. Furthermore, the pathogen was detectable in tomato leaves that had been infected for 4 d, despite the absence of visible phenotypic symptoms of gray mold. [Conclusions] This method is suitable for the early, rapid, sensitive, and visual detection of tomato gray mold, thereby offering technical support for its early diagnosis, prevention, and control.
关键词: Tomato, Botrytis cinerea, Gray mold, Loop-mediated isothermal amplification (LAMP), ACTIN gene
Impacts of Various Herbicide Concentrations on Weed Control Effect and Crop Yield in Soybean and Corn Strip Intercropping Systems
摘要: [Objectives] To identify the optimal combination of herbicide concentrations appropriate for soil closed weeding in the soybean and corn intercropping system in Zhongwei City. [Methods] Two herbicides, 96% (S)-metolachlor and 75% thifensulfuron methyl, were selected for this experiment. A no-herbicide treatment served as the control, and five concentration gradients of the herbicides were established. Prior to sowing, the soil underwent a closed weeding treatment. The impacts of various herbicide concentration combinations on growth indicators, weed control effect, and the yields of soybean and corn across various treatments were analyzed. [Results] The tested combinations of herbicide concentrations did not result in significant phytotoxicity to soybean and corn seedlings. Furthermore, as the herbicide concentrations increased in each treatment, treatments D and E demonstrated the most effective weed control effect. Specifically, 40 d post application, the plant control effect and fresh weight control effect reached 97.25% and 98.03% for treatment D, and 97.25% and 98.24% for treatment E, respectively. Additionally, the yields of both soybean and corn showed significant increases. [Conclusions] Considering the overall output-input ratio in this region, treatment D, comprising 96% (S)-metolachlor at 1 650 mL/hm2 and 75% thifensulfuron-methyl at 48 g/hm2, can be identified as the herbicide concentration combination that provides the most effective weed control effect in the soybean and corn strip intercropping system.
关键词: Soybean and corn strip intercropping, Closed weeding, Control effect, Yield
Practical Effectiveness of Single-spray Multi-Promotion Technology of Silicon Fertilizer on Rice Crops Using Unmanned Aerial Vehicles (UAVs)
摘要: [Objectives] To investigate the effects of silicon fertilizer spraying on the growth, yield, quality, and overall benefits of rice cultivation. [Methods] A systematic experiment involving the single-spray multi-promotion technology of silicon fertilizer via unmanned aerial vehicles (UAVs) was conducted in three representative rice-growing areas: Ma’an Town, Shuikou Subdistrict, and Luzhou Town. [Results] The spraying of silicon fertilizer markedly enhanced the root development of rice, resulting in increased tiller number, plant height, stem thickness, panicle length, and 1 000-grain weight, thereby effectively improving both yield and quality. This treatment exerted six primary beneficial effects: promoting robust and stable seedling growth, enhancing stress resistance, reducing reliance on chemical fertilizers, improving quality, increasing economic benefits, and significantly advancing ecological and social benefits. [Conclusions] The application of silicon fertilizer through spraying is an effective agronomic practice that simultaneously promotes increased rice yield, improved quality, enhanced efficiency, and the sustainable development of resources and the environment.
关键词: Rice, Silicon fertilizer, Unmanned aerial vehicles (UAVs), Single-spray multi-promotion technology, Yield, Quality, Economic benefits, Ecological and social benefits