assimilation of mineral nutrients
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
ASSIMILATION OF MINERAL NUTRIENTSASSIMILATION 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. Mg2+ ASSOCIATION WITH CHLOROPHYLL).
AMMONIA TOXICITYAMMONIA TOXICITY
NITRATE REDUCTASE REACTIONNITRATE REDUCTASE REACTION
NONO33-- + NAD(P)H + H + NAD(P)H + H++ + 2e + 2e-- NO NO22
-- + NAD(P) + NAD(P)++ + H + H22OO
INDUCTION OF NITRATE REDUCTASEINDUCTION OF NITRATE REDUCTASE
NITRITE REDUCTASE REACTIONNITRITE REDUCTASE REACTION
NONO22-- + 6Fd + 6Fdredred + 8H + 8H++ + 6e + 6e-- NHNH44
++ + 6Fd + 6Fdoxox + 2 H + 2 H22OO
• PLANTS CAN ASSIMILATE NITRATE IN BOTH ROOTS AND PLANTS CAN ASSIMILATE NITRATE IN BOTH ROOTS AND SHOOTSSHOOTS
FORMS OF NITROGEN IN XYLEM SAPFORMS OF NITROGEN IN XYLEM SAP
CONVERSION OF AMMONIUM TO AMINO ACIDS CONVERSION OF AMMONIUM TO AMINO ACIDS REQUIRES TWO ENZYMESREQUIRES TWO ENZYMES
(GOGAT)(GS)(GS)
GDH PATHWAYGDH PATHWAY
ASPARTATE FORMATION - TRANSAMINATIONASPARTATE FORMATION - TRANSAMINATION
ASPARAGINE SYNTHESISASPARAGINE SYNTHESIS
SUMMARY OF PROCESSES INVOLVED IN ASSIMILATION SUMMARY OF PROCESSES INVOLVED IN ASSIMILATION OF MINERAL NITROGEN (Leaf)OF MINERAL NITROGEN (Leaf)
“Photoassimilation”
BIOLOGICAL NITROGEN FIXATIONBIOLOGICAL NITROGEN FIXATION
ANABAENA (CYANOBACTERIUM)ANABAENA (CYANOBACTERIUM)
SOYBEAN SOYBEAN ROOT ROOT
NODULESNODULES
Development of infection threadDevelopment of infection thread
Root Nodule DevelopmentRoot Nodule Development
Leghemoglobin
Isoflavonoids, betaines
NOD FACTORS PRODUCED BY BACTERIA ACT AS NOD FACTORS PRODUCED BY BACTERIA ACT AS SIGNALS FOR SYMBIOSISSIGNALS FOR SYMBIOSIS
NOD FACTORS ARE LIPOCHITIN OLIGOSACCHARIDESNOD FACTORS ARE LIPOCHITIN OLIGOSACCHARIDES
THE NITROGENASE REACTIONTHE NITROGENASE REACTION
(oxygen-sensitive)(oxygen-sensitive)
N2 + 8 e- + 8 H+ + 16 ATP
2 NH3 + H2 + 16 ADP + 16 Pi
AMIDES (ASPARAGINE AND GLUTAMINE) AND UREIDES AMIDES (ASPARAGINE AND GLUTAMINE) AND UREIDES ARE THE TRANSPORTED FORMS OF NITROGEN IN ARE THE TRANSPORTED FORMS OF NITROGEN IN
LEGUMESLEGUMES
UREIDESUREIDES
EXAMPLES OF COORDINATION COMPLEXESEXAMPLES OF COORDINATION COMPLEXES
ELECTROSTATIC IONIC COMPLEXESELECTROSTATIC IONIC COMPLEXES
FERROCHELATASE REACTIONFERROCHELATASE REACTION
EXAMPLES OF OXYGENASE REACTIONS IN PLANTSEXAMPLES OF OXYGENASE REACTIONS IN PLANTS