Journal
PEDOSPHERE
Volume 19, Issue 5, Pages 570-576Publisher
SCIENCE PRESS
DOI: 10.1016/S1002-0160(09)60151-X
Keywords
CO2 enrichment; hormones; plant growth; root development; root hairs
Categories
Funding
- National Natural Science Foundation of China [30871590]
- National Key Basic Research Program (973 Program) of China [2009CB119003, 2007CB109305]
- Major Research Program of Zhejiang Province [2008C12061-1]
- National Eleventh Five Years Plan Key Project on Science and Technology of China [2006BAD051303]
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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 mu L L-1), CO2 enrichment (800 mu L 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.
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