Hugo Peter Kortschak (or Kortschack; 4 September 1911, in

Chicago (''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = Country , subdivision_name ...

Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolita ...

– 20 August 1983) was an American

biologist A biologist is a scientist who conducts research in biology. Biologists are interested in studying life on Earth, whether it is an individual Cell (biology), cell, a multicellular organism, or a Community (ecology), community of Biological inter ...

who discovered the

C4 pathway carbon fixation or the Hatch–Slack pathway is one of three known photosynthetic processes of carbon fixation in plants. It owes the names to the 1960's discovery by Marshall Davidson Hatch and Charles Roger Slack that some plants, when su ...

in 1957. This pathway is an adaptation found in plants which reduces loss of

energy In physics, energy (from Ancient Greek: ἐνέργεια, ''enérgeia'', “activity”) is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat a ...

via the inefficient C2 pathway. It is found in several plants, such as

maize Maize ( ; ''Zea mays'' subsp. ''mays'', from es, maíz after tnq, mahiz), also known as corn (North American and Australian English), is a cereal grain first domesticated by indigenous peoples in southern Mexico about 10,000 years ago. Th ...

and

sugarcane Sugarcane or sugar cane is a species of (often hybrid) tall, Perennial plant, perennial grass (in the genus ''Saccharum'', tribe Andropogoneae) that is used for sugar Sugar industry, production. The plants are 2–6 m (6–20 ft) tall with ...

. The C4 pathway was rediscovered by Marshall Hatch and Roger Slack (to whom the discovery is sometimes wrongly credited). In 1981 Kortschak, along with Hatch and Slack, won the

Rank Prize in Nutrition The Rank Prizes comprise the Rank Prize for Optoelectronics and the Rank Prize for Nutrition. The prizes recognise, reward and encourage researchers working in the respective fields of optoelectronics and nutrition. The prizes are funded by the c ...

for "outstanding work on the mechanism of

photosynthesis Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities. Some of this chemical energy is stored i ...

which established the existence of an alternative pathway for the initial fixation of

carbon dioxide Carbon dioxide (chemical formula ) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature. In the air, carbon dioxide is transpar ...

in some important food plants". He was the son of the Austrian-American violinist Hugo Kortschak, father of Alice M Kortschak and Nonnie Winifred Kortschak.

References

1911 births 1983 deaths Plant physiologists 20th-century American botanists American physiologists Scientists from Chicago {{biologist-stub

See also

References