Grain
Norin 10
D tier
Norin 10 is a Japanese semi-dwarf wheat developed in the early twentieth century and later recognised as the critical source of reduced-height (Rht) genes for the Green Revolution. Its short, stiff straw resists lodging under heavy nitrogen fertilisation, allowing higher grain yields without collapse. Though not itself a major commercial milling brand worldwide, Norin 10 is the parent of countless modern semi-dwarf bread and spring wheats via CIMMYT and national programmes. Its legacy is genetic—dwarfing alleles and lodging resistance—rather than a distinct flour flavour class.
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Grades are placed along a shared scale so systems can be compared side by side.
History
Japanese breeders selected short-straw wheats including lines that led to Norin 10.
Norin 10 was released as a semi-dwarf cultivar suited to intensive Japanese agriculture.
Post-war scientific exchanges brought Norin 10 to the attention of U.S. and international breeders.
Orville Vogel used Norin 10 in Washington State crosses that produced Gaines and other semi-dwarfs.
Norman Borlaug’s CIMMYT programme incorporated Norin 10 dwarfing into spring wheats for Mexico and Asia.
Green Revolution semi-dwarf wheats carrying Norin 10 Rht genes transformed global yields and trade.