George Harrison Shull

{{short description|American geneticist}} {{Use mdy dates|date=July 2025}} {{Infobox scientist | name = George Harrison Shull | image = George Harrison Shull (1874–1954).png | caption = | birth_date = {{Birth date|1874|04|15}} | birth_place = Clark County, Ohio, US. | death_date = {{Death date and age|1954|09|28|1874|04|15}} | death_place = Princeton, New Jersey, US. | resting_place = Santa Rosa Odds Fellows Cemetery, Santa Rosa, Sonoma County, California, US. | ethnicity = | field = Genetics | work_institutions = | alma_mater = University of Chicago | doctoral_advisor = | doctoral_students = | known_for = | author_abbrev_bot = Shull | author_abbrev_zoo = | influences = | influenced = | prizes = Public Welfare Medal (1948) | footnotes = | signature = }} '''George Harrison Shull''' (April 15, 1874 – September 28, 1954) was an American plant geneticist who played a central role in the development of hybrid maize and in establishing the genetic basis of heterosis.<ref>{{cite magazine |title=Shull, George Harrison |magazine=The International Who's Who in the World |year=1912 |page=953 |url=https://books.google.com/books?id=I-wRAAAAYAAJ&pg=PA953}}</ref>

He was one of several siblings who pursued careers in biology; his brothers included the plant physiologist Charles Albert Shull, professor at the University of Chicago and founding editor-in-chief of ''Plant Physiology''; the zoologist Aaron Franklin Shull of the University of Michigan; and the botanist and botanical illustrator J. Marion Shull. Another brother was John William Scholl, a scholar of German literature, poet, and genealogist. His niece, the geneticist Elizabeth Shull Russell of the Jackson Laboratory, was elected to the National Academy of Sciences and served as president of the Genetics Society of America.<ref>{{cite web |title=Elizabeth S. Russell |url=https://www.nasonline.org/directory-entry/elizabeth-s-russell-aitzap/ |publisher=National Academy of Sciences |access-date=2026-03-09}}</ref> His son Harrison Shull (1923–2003) was also a distinguished scientist specializing in the quantum mechanics of small-molecule electronic spectra.<ref>{{cite book |last1=McClure |first1=Donald |last2=Kasha |first2=Michael |title=Harrison Shull |series=Biographical Memoirs |volume=87 |publisher=National Academy of Sciences Press |year=2006 |pages=332–398 |doi=10.17226/11522 |isbn=978-0-309-09579-2 |url=http://www.nap.edu/openbook.php?record_id=11522&page=332}}</ref>

==Early life and education==

George Harrison Shull was born on a farm in Clark County, Ohio. He graduated from Antioch College in 1901 and earned a Ph.D. from the University of Chicago in 1904. He served as a botanical expert for the Bureau of Plant Industry in 1903–1904.

==Career and research==

Shull subsequently became a botanical investigator at the Carnegie Institution at the Station for Experimental Evolution in Cold Spring Harbor, New York. There he conducted influential research on plant genetics and breeding.

Working primarily with maize, Shull developed true-breeding inbred lines and experimentally crossed them. He observed that hybrids derived from these weak inbred strains were often vigorous and uniform, a phenomenon he described in 1908. Shull later introduced the term heterosis in 1914 to describe the increased vigor of hybrid offspring. His work demonstrated that high-yielding maize could be produced by crossing carefully maintained inbred lines, providing the scientific foundation for modern hybrid maize breeding.

The application of these principles led to the development of hybrid maize breeding programs in the early twentieth century.<ref name=":0" /> Early hybrid seed production often relied on double-cross hybrids derived from multiple inbred lines, which were easier to produce at scale. Subsequent advances in breeding and seed production enabled the use of single-cross hybrids, which provided greater uniformity and higher yields and became the dominant form of hybrid maize used in commercial agriculture.<ref name=":0">{{cite journal |last=Sprague |first=George F. |title=The Experimental Basis for Hybrid Maize |journal=Biological Reviews |volume=21 |issue=2 |year=1946 |pages=101–120 |doi=10.1111/j.1469-185X.1946.tb00317.x}}</ref> The practical success of hybrid maize demonstrated how fundamental genetic research could lead to transformative agricultural innovations.<ref>{{cite journal |last=Nelson |first=Richard R. |title=The Economics of Invention: A Survey of Literature |journal=The Journal of Business |volume=32 |issue=2 |date=April 1959 |pages=101–127 |publisher=University of Chicago Press |doi=10.1086/294247}}</ref>

Parallel work by the American geneticist Edward Murray East at the Connecticut Agricultural Experiment Station helped confirm the genetic basis of hybrid vigor and contributed to the development of hybrid corn breeding systems that were later widely adopted in agriculture.<ref name=":0" />

[[File:George Harrison Shull with hybrid corn 1949.jpg|thumb|upright|Shull with hybrid corn, 1949. The photograph was inscribed to President Harry S. Truman as “Originator of Hybrid Corn.”]]

For his contributions to agricultural science, Shull received the Public Welfare Medal from the National Academy of Sciences in 1948.<ref name=PublicWelfare>{{cite web |title=Public Welfare Award |url=http://www.nasonline.org/site/PageServer?pagename=AWARDS_pwm |publisher=National Academy of Sciences |access-date=14 February 2011 |url-status=dead |archive-url=https://web.archive.org/web/20110604024100/http://www.nasonline.org/site/PageServer?pagename=AWARDS_pwm |archive-date=4 June 2011}}</ref> He was also elected to the American Philosophical Society.<ref>{{cite web |title=APS Member History |url=https://search.amphilsoc.org/memhist/search?creator=George+H.+Shull&title=&subject=&subdiv=&mem=&year=&year-max=&dead=&keyword=&smode=advanced |website=American Philosophical Society |access-date=2023-10-05}}</ref>

Shull was also the founding editor of the scientific journal ''Genetics''. ==Personal life== Shull married Ella Amanda Hollar in July 1906. A daughter, Elizabeth Ellen, born May 8, 1907, did not survive her birth. Ella died two weeks later.<ref name=":1">{{cite book |url=https://archive.org/details/gardenertouchedw00pete/page/143/mode/1up |title=A Gardener Touched with Genius, The Life of Luther Burbank |first=Peter |last=Dreyer |publisher=University of California Press |isbn=0520051165 |page=143 |date=1985 |access-date=2025-07-12 |via=Internet Archive |url-access=registration}}</ref> All are buried in Santa Rosa, California, in the Santa Rosa Odd Fellows Cemetery. Shull married Mary Julia Nicholl on August 26, 1909.<ref name=":1" /> He and his second wife had six children (John Shull, Georgia Shull Vandersloot, Frederick Shull, David Shull, Barbara Shull Miller, and Harrison Shull).

==Death== Shull died in Princeton on September 28, 1954. His cremains were buried in Santa Rosa, California where his first wife was buried. His second wife's remains were also buried there twelve years later.<ref name=":1" /> <ref>Santa Rosa Memorial Park map Lot #52</ref>

==References== {{Reflist}}

==Selected publications== *{{cite journal |last=Shull |first=George H. |year=1907 |title=The Significance of Latent Characters |journal=Science |volume=25 |issue=646 |pages=792–794 |doi=10.1126/science.25.646.792 |pmid=17810906}} *{{cite journal |last=Shull |first=George H. |year=1907 |title=Some Latent Characters of a White Bean |journal=Science |volume=25 |issue=647 |pages=828–832 |doi=10.1126/science.25.647.828-b |pmid=17828973}} *{{cite journal |last=Shull |first=George H. |year=1946 |title=Hybrid Seed Corn |journal=Science |volume=103 |issue=2679 |pages=547–550 |doi=10.1126/science.103.2679.547 |pmid=17800109}}

==Further reading== *Smocovitis, V. B. (2000). ''Shull, George Harrison''. American National Biography Online. *Fedoroff, Nina; Brown, Nancy Marie (2004). ''Mendel in the Kitchen''. Joseph Henry Press. pp. 57–62. ==External links== *[http://www.nap.edu/readingroom/books/biomems/hshull.pdf Biographical Memoir] of Harrison Shull, George's son * {{commons category-inline|George Harrison Shull}}

{{DEFAULTSORT:Shull, George Harrison}} Category:1874 births Category:1954 deaths Category:American geneticists Category:American botanists Category:University of Chicago alumni Category:People from Clark County, Ohio Category:Genetics (journal) editors Category:Members of the American Philosophical Society Category:Presidents of the American Society of Naturalists