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| DOI：10.13522/j.cnki.ggps.2025066 |
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| The effects of water stress on physiological traits, disease infection, and quality of Panax notoginseng |
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WANG Qijian, DING Hao, YANG Ling, YAN Mingtai, YANG Qiliang
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1. School of Electronic Engineering/School of Intelligent Manufacturing, Anhui Xinhua University, Hefei 230088, China;
2. College of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming 650500, China;
3. Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, China
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| Abstract: |
| 【Objective】Panax notoginseng is a valuable medicinal herb widely used in traditional Chinese medicine for its high content of bioactive saponins. Its growth and medicinal quality are sensitive to environmental conditions. This paper investigates the effects of different water stress levels on growth, physiological traits, yield and quality of Panax notoginseng.【Method】The experiment consisted of four water amount treatments: 4.29, 7.14, 10.00 and 12.86 mm. During the experiment, we measured growth traits, dry matter accumulation, physiological traits, yield and quality of Panax notoginseng. The TOPSIS method was used to evaluate the impact of irrigation amount on the quality of Panax notoginseng.【Result】① As time elapsed, the changes in plant height, stem diameter, leaf length and leaf area of the plant showed approximately the same trend, all reaching the maximum at the fruiting stage. These traits were the highest in W2. ② With increasing water stress, the net photosynthetic rate of the plant increased first and then decreased, while the transpiration rate increased consistently. The net photosynthetic rate and transpiration rate of the plant were the highest in W2. ③ The accumulation of active ingredients in the plant was the largest in W2. The maximum above-ground dry mass and fresh mass in W2 were 6.15 g and 6.38 g, respectively; the associated maximum dry and fresh mass of the roots were 1.64 g and 3.66 g, respectively. The maximum total yield in the W2 was 1 315.82 kg/hm2. In W2, the maximum values of notoginsenoside R1, ginsenoside Rg1, Re, Rb1, Rd, and total saponins in the plant were 1.56%, 3.04%, 0.15%, 2.87%, 2.52% and 10.14%, respectively. ④ With the increase in water stress, the leaf disease incidence decreased first and then increased. W2 was most effective in inhibiting leaf disease, with disease incident being 3.94%. ⑤ The TOPSIS analysis showed the Ci value of W2 was the highest.【Conclusion】A single irrigation amount of 7.14 mm is optimal for growth of Panax notoginseng, with high accumulation of active ingredients and low leaf disease infection. |
| Key words: Panax notoginseng; plant phenotype; water stress; growth regularity; yield |
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