The decarboxylation of OAA catalyzed by PEPCK yields CO2, using ATP provided by mitochondrial respiration.

TLS Online TPP Program

#Id: 5076

#Unit 6. System Physiology – Plant

A common feature of all active auxins is a molecular distance of about 0.5 nm between a fractional positive charge on the aromatic ring and a negatively charged carboxyl group.

TLS Online TPP Program

#Id: 5077

#Unit 6. System Physiology – Plant

Structure of three natural auxins

TLS Online TPP Program

#Id: 5078

#Unit 6. System Physiology – Plant

Indole-3-acetic acid (IAA) occurs in all plants, Peas, for example, contain 4-chloroindole-3-acetic acid. Mustards and corn contain indole-3- butyric acid (IBA).

TLS Online TPP Program

#Id: 5079

#Unit 6. System Physiology – Plant

Structure of synthetic auxin, most synthetic auxins are used as herbicides in horticulture and agriculture.

TLS Online TPP Program

#Id: 5080

#Unit 6. System Physiology – Plant

The nuclear genes that encode messages for chloroplast proteins:  the small subunit of ribulose-1,6-bisphosphate carboxylase/oxygenase (rubisco) and the major light-harvesting chlorophyll a/b–binding proteins associated with the light-harvesting complex of photosystem II (LHCII-b proteins).

TLS Online TPP Program

#Id: 5081

#Unit 6. System Physiology – Plant

The genes for both of these proteins—RBCS and LHCB (also called CAB) —are present in multiple copies in the genome.