Effects of Free-air CO2 Enrichment on Root Characteristics and C:N Ratio of Rice at the Heading Stage

Abstract

Abstract: A hydroponics experiment was conducted to investigate the rice root growth in FACE (free-air carbon dioxide enrichment). The root biomass, root volume, ratio of root/shoot, number of adventitious roots and root diameter significantly increased under FACE conditions, while the CO₂enrichment decreased the N concentration in rice roots without any change in the C content, leading to an increase in root C:N ratio. Moreover, the elevated CO₂ resulted in a remarkable decrease of root activity, expressed as per unit root dry weight, which might be responsible for decreased N concentration in roots.

Key words: free-air CO2 enrichment (FACE), rice, root C:N ratio, root activity

CHEN Gai-ping, CHENG Lei, ZHU Jian-guo, PANG Jing, XIE Zu-bin, ZENG Qing. Effects of Free-air CO₂ Enrichment on Root Characteristics and C:N Ratio of Rice at the Heading Stage[J]. RICE SCIENCE, 2006, 13(2): 120-124 .

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Effects of Free-air CO₂ Enrichment on Root Characteristics and C:N Ratio of Rice at the Heading Stage

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