Respirasi 1

respirasi

Glycolysis, TCA Cycle, and ET

Growth respiration • Sugars transported to meristematic regions • A portion is respired to provide the energy needed to metabolize and assemble sugars into cell walls and other plant parts and compounds • Respiratory “costs” vary by composition of tissue (cellulose, protein, lipid, lignin, etc.) • Temperature affects composition of tissue formed – more lignin at higher temperatures

Apical meristem

Maintenance respiration • Needs for maintenance and repair for synthesis of proteins and lipids, ion concentrations, etc. • Doubles with each 18F (10C) increase in temperature. • Thus, cool night temperatures reduce respiration costs. • High protein tissues require higher maintenance respiration (enzymes degrade rapidly). • Nutrient uptake when active transport costs ATP, allowing selective accumulation and exclusion at a respiratory cost.