Opportunities for increased nitrogen-use efficiency from improved lowland rice germplasm

Ladha, J.K. and Kirk, G.J.D. and Bennett, J. and Peng, S. and Reddy, C.K. and Reddy, P.M. and Singh, U. (1998) Opportunities for increased nitrogen-use efficiency from improved lowland rice germplasm. Field Crops Research, 56 (1-2). pp. 41-71.

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Abstract

Understanding of the mechanisms governing the efficient use of N by rice plants—both its acquisition and internal use—is reviewed. Acquisition efficiency is considered in terms of root properties influencing the absorption and assimilation of NH+4 and other N species, and their regulation; root-induced changes in the rhizosphere affecting N mineralization, transformation and transport; and root-associated biological N2 fixation. Efficiency of internal use is considered in terms of the translocation, distribution and remobilization of absorbed N in different plant organs, flag leaf N import/export and leaf senescence patterns, and the efficiency with which N is used in CO2 fixation. Evidence for genetic variation in both acquisition efficiency and internal-use efficiency is given for plants under N-sufficient and N-limited conditions. The possibility of incorporating in rice the machinery for N2 fixation is discussed.

Item Type: Article
Author Affiliation: International Rice Research Institute, P.O. Box 933, 1099, Manila, Philippines
Subjects: Crop Improvement
Crop Improvement > Seed Technology
Divisions: Other Crops
Depositing User: Sandhya Gir
Date Deposited: 02 May 2011 05:44
Last Modified: 02 May 2011 05:44
Official URL: http://dx.doi.org/10.1016/S0378-4290(97)00123-8
URI: http://eprints.icrisat.ac.in/id/eprint/1940

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