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KMID : 1098420170250060397
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Korean Journal of Medicinal Crop Science
2017 Volume.25 No. 6 p.397 ~ p.403
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Determination of Growth, Yield and Carbohydrate Content of Allium hookeri Grown under Shading Treatment
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Kim Myung-Hee
Song Beong-Min
Choi Eun-Young
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Abstract
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Background: This study was aimed at evaluating the growth, yield, and carbohydrate content in the whole Allium hookeri plant with shading treatment in hot summer.
Methods and Results: Different shading rate, including 0 (control), 35 or 55%, was employed from the June 21st to August 31st. Daily average air and soil temperature, which were approximately 2.5°C and 3.8°C lower, respectively, were observed with both 35% and 55% treatments in July and August, with no significant difference in daily maximum air temperature. Dry weights were high, approximately 40% and 48% for the shoot and 20% and 12% for the root, with the 35% and 55% treatments, respectively, 8 weeks after shading. Division number was increased by 13% and 19.8% with the 35% and 55% treatments, respectively. The mortality rates of 150 plants were 9.1%, 4.0%, and 1.3% with the 0 (control), 35% and 55% treatments, respectively. At 4 weeks after shading, the highest and lowest sucrose levels in both shoot and root were observed with the 35% and 55% treatments, respectively. At 8 weeks after shading, there was no significant difference in the sucrose content in the shoot among the treatments.
Conclusions: The highest plant growth rate and yield with the 55% treatment may be related with the decrease in both air and soil temperatures, resulting in reducted leaf respiration and thus compensate net photosynthesis.
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KEYWORD
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Allium hookeri, Photosynthesis Rate, Soil Temperature, Solar Irradiance
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