6 �(1)

co₂

Air

2 Pi

I

ATP + P, AMP + PP,

HCOi

carbonic

anhydrase

Pi

Ł    CH₂    7 j

-► C—OPO?“-

pyruvate-

phosphate

dikinaso

I

co;

PEP carboxylase

Phosphoenol-pyruvate (PEP)

ę°₂-

I    NADPH NADP

CH₂

—c=o

malate

CO^-

2    dehydrogenase

Oxaloacetate

CO.7 I “ CH₂

H—C—OH

I

co₂^-

Malate

Mesophyll celi

CH₃

i

- c=o -I

co₂^-

Pvruvate

malic enzym©

C0₂ + NADPH Calvin cycle

3PG

NADP^h

Bundle-sheath celi

Figurę 24-41 The C₄ pathway. CO, is conccntratcd in thc mesophyll cclls and transported to thc bundle-sheath cclls for entry into the Calvin cycle.