Chap 4. Growth and Metabolism I. Terminology 1. Growth – Irreversible increase in size 2. Development: Morphogenesis - Morphological and anatomical development Differentiation - Physiological and biochemical specialization of plant tissues 3. Metabolism: Synthesis and degradation of organic compounds Anabolism - synthesis Catabolism – degradation (breakdown)
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Chap 4. Growth and Metabolism
I. Terminology
1. Growth – Irreversible increase in size
2. Development:
Morphogenesis - Morphological and anatomical development
Differentiation - Physiological and biochemical specialization
of plant tissues
3. Metabolism: Synthesis and degradation of organic
The energy released from respiration is used for growth and development of plants
How Do Plants Manufacture Their Own Food?
1. Light phase of photosynthesis
Photolysis – Cleavage of water into hydrogen and oxygen by light enery
Photophosphorylation
Conversion of ADP to ATP by light energy
Sum: Conversion of light energy to chemical energy
ADP ATP
e-
H2OO2
H+ e-
NADP NADPH2 (Hill Reaction)
ATPADP
Energy
NADP
H+NADPH2 (Reducing power)
used in many energy transfer process of the cell
III. Photosynthesis
2. Dark Phase of Photosynthesis
Calvin Cycle
12 3PGAC3
Calvin Cycle
6 CO2
12 Diphosphoglyceride C3
12 Glyceraldehyde–3P C3
6 RuBP C5
Glyceraldehyde3-P
12 ATP
12 ADP + 12 Pi
12 NADPH2
12 NADP
2 3PGAC3
Fructose C6
Glucose C6
C12 (C6)n
Sucrose starch
C3
6Pi+6ADP
6 ATP
A series of enzymatically mediated reactions in which CO2 reduced to 3-phosphoglyceraldehyde(3PGA) and the CO2 receptor (Ribulosebiphosphate:RUBP) is generated