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<p>This study was conducted to investigate the effects of root zone temperature (RZT) on the growth of medicinal crop seedlings. Seed tubers of <i>Codonopsis lanceolata</i> and seeds of <i>Rehmannia glutinosa</i> were sown and, following germination or sprouting, transplanted into seedling boxes with controlled RZTs. Four chillers were installed to regulate the RZT, and temperature-controlled water was circulated continuously through five irrigation tubes embedded within the root media to maintain RZTs of 9&#xa0;°C, 12&#xa0;°C, 15&#xa0;°C, and 18&#xa0;°C. Seedlings were grown under these conditions, and growth parameters were measured 34 days after sowing for <i>Rehmannia glutinosa</i> and 47 days for <i>Codonopsis lanceolata</i>. In both species, increasing the RZT from 9&#xa0;°C to 18&#xa0;°C resulted in a linear or exponential increase in shoot height, leaf length, leaf width, shoot fresh and dry weights, root length, and root fresh and dry weights. Furthermore, higher RZTs led to increased tissue nutrient content and decreased nutrient concentrations in the root medium. Most of the analyzed nutrient elements showed significant trends of linear or quadratic regression. Based on these results, it is recommended to maintain the RZT at or above 18&#xa0;°C to promote optimal seedling growth of <i>Rehmannia glutinosa</i> and <i>Codonopsis lanceolata</i>. Considering the growing need for standardized medicinal crop seedlings suitable for mechanical transplanting, these findings can serve as a foundation for controlled seedling production systems.</p>

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Effect of root zone temperatures on seedling growth and nutrient uptake of Rehmannia glutinosa and Codonopsis lanceolata

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Myong Sun Park,
  • In Sook Park,
  • Chang Yong Shim,
  • Jong Myung Choi,
  • Jong Pil Chun

摘要

This study was conducted to investigate the effects of root zone temperature (RZT) on the growth of medicinal crop seedlings. Seed tubers of Codonopsis lanceolata and seeds of Rehmannia glutinosa were sown and, following germination or sprouting, transplanted into seedling boxes with controlled RZTs. Four chillers were installed to regulate the RZT, and temperature-controlled water was circulated continuously through five irrigation tubes embedded within the root media to maintain RZTs of 9 °C, 12 °C, 15 °C, and 18 °C. Seedlings were grown under these conditions, and growth parameters were measured 34 days after sowing for Rehmannia glutinosa and 47 days for Codonopsis lanceolata. In both species, increasing the RZT from 9 °C to 18 °C resulted in a linear or exponential increase in shoot height, leaf length, leaf width, shoot fresh and dry weights, root length, and root fresh and dry weights. Furthermore, higher RZTs led to increased tissue nutrient content and decreased nutrient concentrations in the root medium. Most of the analyzed nutrient elements showed significant trends of linear or quadratic regression. Based on these results, it is recommended to maintain the RZT at or above 18 °C to promote optimal seedling growth of Rehmannia glutinosa and Codonopsis lanceolata. Considering the growing need for standardized medicinal crop seedlings suitable for mechanical transplanting, these findings can serve as a foundation for controlled seedling production systems.