Pedosphere 19(5): 570--576, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effect of CO2 elevation on root growth and its relationship with indole acetic acid and ethylene in tomato seedlings
WANG Yue1,5, DU Shao-Ting3, LI Ling-Ling1, HUANG Li-Dong2, FANG Ping2, LIN Xian-Yong1, ZHANG Yong-Song1 and WANG Hai-Long4
1 Ministry of Education, Key Laboratory of Environmental Remediation and Ecosystem Health, College of Natural Re-sources and Environmental Science, Zhejiang University, Hangzhou 310029 (China)
2 Key Laboratory of Subtropical Soil Science and Plant Nutrition of Zhejiang Province, College of Natural Resources and Environmental Science, Zhejiang University, Hangzhou 310029 (China)
3 College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310035 (China)
4 Scion, Private Bag 3020, Rotorua(New Zealand)
5 College of Land and Environment, Shenyang Agricultural University, Shenyang 110161 (China)
ABSTRACT
      A hydroponic experiment was carried out to study the effect of elevated carbon dioxide (CO2) on root growth of tomato seedlings.Compared with the control (350 μL L-1),CO2 enrichment (800 μL L-1) significantly increased the dry matter of both shoot and root,the ratio of root to shoot,total root length,root surface area,root diameter,root volume,and root tip numbers,which are important for forming a strong root system.The elevated CO2 treatment also significantly improved root hair development and elongation,thus enhancing nutrient uptake.Increased indole acetic acid concentration in plant tissues and ethylene release in the elevated CO2 treatment might have resulted in root growth enhancement and root hair development and elongation.
Key Words:  CO2 enrichment, hormones, plant growth, root development, root hairs
Citation: Wang, Y., Du, S. T., Li, L. L., Huang, L. D., Fang, P., Lin, X. Y., Zhang, Y. S. and Wang, H. L. 2009. Effect of CO2 elevation on root growth and its relationship with indole acetic acid and ethylene in tomato seedlings. Pedosphere. 19(5): 570-576.
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