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| Cell Production and Expansion in the Primary Root of Maize in Response to Low-Nitrogen Stress |
| GAO Kun, CHEN Fan-jun, YUAN Li-xing , MI Guo-hua |
| Key Laboratory of Plant-Soil Interaction, Ministry of Agriculture/Center for Resources, Environment and Food Security, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, P.R.China |
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摘要 Maize plants respond to low-nitrogen stress by enhancing root elongation. The underlying physiological mechanism remains unknown. Seedlings of maize (Zea mays L., cv. Zhengdan 958) were grown in hydroponics with the control (4 mmol L-1) or low-nitrogen (40 μmol L-1) for 12 d, supplied as nitrate. Low nitrogen enhanced root elongation rate by 4.1-fold, accompanied by increases in cell production rate by 2.2-fold, maximal elemental elongation rate (by 2.5-fold), the length of elongation zone (by 1.5-fold), and final cell length by 1.8-fold. On low nitrogen, the higher cell production rate resulted from a higher cell division rate and in fact the number of dividing cells was reduced. Consequently, the residence time of a cell in the division zone tended to be shorter under low nitrogen. In addition, low nitrogen increased root diameter, an increase that occurred specifically in the cortex and was accompanied by an increase in cell number. It is concluded that roots elongates in response to low-nitrogen stress by accelerating cell production and expansion.
Abstract Maize plants respond to low-nitrogen stress by enhancing root elongation. The underlying physiological mechanism remains unknown. Seedlings of maize (Zea mays L., cv. Zhengdan 958) were grown in hydroponics with the control (4 mmol L-1) or low-nitrogen (40 μmol L-1) for 12 d, supplied as nitrate. Low nitrogen enhanced root elongation rate by 4.1-fold, accompanied by increases in cell production rate by 2.2-fold, maximal elemental elongation rate (by 2.5-fold), the length of elongation zone (by 1.5-fold), and final cell length by 1.8-fold. On low nitrogen, the higher cell production rate resulted from a higher cell division rate and in fact the number of dividing cells was reduced. Consequently, the residence time of a cell in the division zone tended to be shorter under low nitrogen. In addition, low nitrogen increased root diameter, an increase that occurred specifically in the cortex and was accompanied by an increase in cell number. It is concluded that roots elongates in response to low-nitrogen stress by accelerating cell production and expansion.
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Received: 08 April 2013
Accepted: 14 November 2014
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| Fund: This work was financially supported by the National Natural Science Foundation of China (31071852 and 31121062). We thank Professor Tobias I Baskin (University of Massachusetts Amherst, USA) for the critical comments on the kinematic analysis and great assistance in manuscript preparation. |
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Corresponding Authors:
MI Guo-hua, E-mail: miguohua@cau.edu.cn
E-mail: miguohua@cau.edu.cn
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| About author: GAO Kun, Mobile: 15810536392, E-mail: happycreek@126.com |
Cite this article:
GAO Kun, CHEN Fan-jun, YUAN Li-xing , MI Guo-hua.
2014.
Cell Production and Expansion in the Primary Root of Maize in Response to Low-Nitrogen Stress. Journal of Integrative Agriculture, 13(11): 2508-2517.
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