Definition
noun
An abbreviation for hatch slack kortshak pathway: a metabolic pathway first determined by Burr and Kortshak in their experiments that later led to its in-depth description 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.
Supplement
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.
Synonym: Hatch slack kortshak pathway, C4 carbon fixation pathway.
Compare: C3 carbon fixation pathway, Crassulacean acid metabolism.
See also: C4 plant.
Dictionary > Hsk pathway
You will also like...
Population Regulation in an Ecosystem
With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..
A Balanced Diet – Minerals and Proteins
Proteins and minerals can be derived from various dietary sources. They are essential for the proper growth and developm..
New Zealand’s Unique Geographical History
Explore why New Zealand has such unique flora and fauna, and learn why long periods of geographical isolation. This less..
Adaptation Tutorial
Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..
The Human Physiology
Physiology is the study of how living organisms function. Thus, human physiology deals specifically with the physiologic..
Biological Cell Defense
Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..