ASSIMILATION OF MINERAL NUTRIENTS NUTRIENT ASSIMILATION: THE INCORPORATION OF MINERAL NUTRIENTS INTO ORGANIC COMPOUNDS. ASSIMILATION OF SOME NUTRIENTS—PARTICULARLY.

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Presentation transcript:

ASSIMILATION OF MINERAL NUTRIENTS NUTRIENT ASSIMILATION: THE INCORPORATION OF MINERAL NUTRIENTS INTO ORGANIC COMPOUNDS. ASSIMILATION OF SOME NUTRIENTS—PARTICULARLY NITROGEN AND SULFUR—REQUIRES A COMPLEX SERIES OF BIOCHEMICAL REACTIONS. ASSIMILATION OF OTHER NUTRIENTS INVOLVES THE FORMATION OF COMPLEXES WITH ORGANIC COMPOUNDS (e.g. Mg 2+ ASSOCIATION WITH CHLOROPHYLL).

AMMONIA TOXICITY

NITRATE REDUCTASE REACTION NO NAD(P)H + H + + 2e -  NO NAD(P) + + H 2 O

INDUCTION OF NITRATE REDUCTASE

NITRITE REDUCTASE REACTION NO Fd red + 8H + + 6e -  NH Fd ox + 2 H 2 O PLANTS CAN ASSIMILATE NITRATE IN BOTH ROOTS AND SHOOTS PLANTS CAN ASSIMILATE NITRATE IN BOTH ROOTS AND SHOOTS

FORMS OF NITROGEN IN XYLEM SAP

CONVERSION OF AMMONIUM TO AMINO ACIDS REQUIRES TWO ENZYMES (GOGAT) (GS)

GDH PATHWAY

ASPARTATE FORMATION - TRANSAMINATION

ASPARAGINE SYNTHESIS

SUMMARY OF PROCESSES INVOLVED IN ASSIMILATION OF MINERAL NITROGEN (Leaf) “Photoassimilation”

BIOLOGICAL NITROGEN FIXATION

ANABAENA (CYANOBACTERIUM)

SOYBEAN ROOT NODULES

Development of infection thread

Root Nodule Development Leghemoglobin Isoflavonoids, betaines

NOD FACTORS PRODUCED BY BACTERIA ACT AS SIGNALS FOR SYMBIOSIS NOD FACTORS ARE LIPOCHITIN OLIGOSACCHARIDES

THE NITROGENASE REACTION (oxygen-sensitive) N e H ATP  2 NH 3 + H ADP + 16 P i

AMIDES (ASPARAGINE AND GLUTAMINE) AND UREIDES ARE THE TRANSPORTED FORMS OF NITROGEN IN LEGUMES UREIDES

EXAMPLES OF COORDINATION COMPLEXES

ELECTROSTATIC IONIC COMPLEXES

FERROCHELATASE REACTION

EXAMPLES OF OXYGENASE REACTIONS IN PLANTS