Dictionary > Hatch-Slack pathway

Hatch-Slack pathway

A metabolic pathway first delineated in depth by M. D. Hatch and C. R. Slack (in 1966).
In this pathway, the CO2 is first added to phosphoenolpyruvate by the enzyme, PEP carboxylase, producing the four-carbon compound in mesophyll cells that is later transported to bundle sheath cells to liberate the CO2 for use in the Calvin cycle.
Instead of the direct carbon fixation in the Calvin cycle like in C3 carbon fixation, the C4 pathway involves steps that first converts pyruvate to phosphoenolpyruvate (PEP) to bind with the CO2 forming a four-carbon compound (hence the name C4). As a result, the photorespiration pathway is bypassed, and the wasteful loss of CO2 common in C3 carbon fixation pathway is minimized.
Plants that first go through the C4 pathway are better adapted than plants that solely go through the C3 pathway under conditions of drought, high temperatures and low nitrogen or CO2 concentrations.
Word origin: from M.D. Hatch and C.R. Slack who first described it.
Synonym: Hatch slack kortshak pathway, C4 carbon fixation pathway.

Compare: C3 carbon fixation pathway, Crassulacean acid metabolism.

See also: C4 plant.

You will also like...

Independent Assortment and Crossing Over
Independent Assortment and Crossing Over

This tutorial describes the independent assortment of chromosomes and crossing over as important events in meiosis. Read..

Early Earth
The Origins of Life

This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..

Gibberellins and Gibberellic Acid
Gibberellins and Gibberellic Acid

This tutorial describes the role of gibberellin family in plants. Find out the effects of gibberellin on plant growth an..

human respiratory system

The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

Water Cycle
The Water Cycle

The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

primitive arthropods

The arthropods were assumed to be the first taxon of species to possess jointed limbs and exoskeleton, exhibit more adva..