Cover illustration: (Top) Nitrogen remobilization model in rice. (See Tabuchi et al., pp. 2319–2327.) (Middle) Cytosolic glutamine synthetase plays a major role in the control of grain yield in maize, whatever the level of nitrogen fertilization. (See Hirel et al., pp. 2369–2387.) (Bottom) Possible modes of glutamate signalling in the root. (See Forde and Lea, pp. 2339–2358.)
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