Products of Biological Nitrogen Fixation in Higher Plants: Synthesis, Transport, and Metabolism

INTRODUCTION 539 THE EXCHANGE OF REDUCED CARBON AND NITROGEN: AN OVERVIEW. ... 540 MAJOR PRODUCTS OF RECENTLY FIXED N2 EXPORTED FROM NODULES.... 542 SYNTHESIS OF AMIDES AND UREIDES 546 Ammonium Assimilation .... 546 Asparagine Synthesis . 547 Synthesis of 4-Methyleneglutamine 548 Synthesis of Citrulline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 549 Biogenesis of Allantoin and Allantoic Acid 551 METABOLISM OF AMIDES AND UREIDES . ......... . . ... . . ........ .... . . .. ..... . 558 ENERGETICS OF SYNTHESIS AND METABOLISM OF THE PRODUCTS OF Nz FIXATION 564 SUMMARy......... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 567