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http://dx.doi.org/10.7235/hort.2015.15099

Silicon Supply through Subirrigation System Alleviates High Temperature Stress in Poinsettia by Enhancing Photosynthetic Rate  

Son, Moon Sook (Department of Horticulture, Division of Applied Life Science (BK21 Plus), Graduate School of Gyeongsang National University)
Park, Yoo Gyeong (Institute of Agriculture & Life Science, Gyeongsang National University)
Sivanesan, Iyyakkannu (Institute of Agriculture & Life Science, Gyeongsang National University)
Ko, Chung Ho (Department of Horticulture, Division of Applied Life Science (BK21 Plus), Graduate School of Gyeongsang National University)
Jeong, Byoung Ryong (Department of Horticulture, Division of Applied Life Science (BK21 Plus), Graduate School of Gyeongsang National University)
Publication Information
Horticultural Science & Technology / v.33, no.6, 2015 , pp. 860-868 More about this Journal
Abstract
The effect of Si supplied during plant cultivation on tolerance to high temperature stress in Euphorbia pulcherrima Willd. 'Ichiban' was investigated. Rooted cuttings were transplanted into 10-cm pots and a complete nutrient solution, containing 0 or $50mg{\cdot}L^{-1}$ Si as either $K_2SiO_3$, $Na_2SiO_3$, or $CaSiO_3$, was supplied through subirrigation or weekly foliar applications. After two months of cultivation, plants were placed in an environment-controlled chamber and subjected to $35{\pm}1^{\circ}C$ (high temperature) conditions for 18 days. Enhanced specific activities of enzymatic antioxidants (APX) and suppressed specific activities of non-enzymatic antioxidants (ELP) were observed in the high temperature-stressed plants with Si application. The Fv/Fm (maximum quantum yield of photosystem II), photosynthetic rate, and Si contents in the shoot increased in the treatments of $K_2SiO_3$ and $Na_2SiO_3$ supplied through subirrigation. The Si-treated plants had more tolerance of high temperature stress than the control plants. Of the Si sources and application methods tested, $K_2SiO_3$ and $Na_2SiO_3$ supplied through subirrigation were found to be the most effective in enhancing tolerance to high temperature stress.
Keywords
calcium silicate; foliar application; heat stress; potassium silicate; sodium silicate; subirrigational supply;
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