Reduction of Pollen Number and Anther Length in Bread Wheat Studied by a Nested Association Mapping Population
Hamaya, N.-B.; Kakui, H.; Okada, M.; Jilu, N.; Jung, K.; Nitta, M.; Wicker, T.; Keller, B.; Nasuda, S.; Shimizu, K. K.
Crop Improvement
Every loaf of bread you bake depends on wheat plants that can pollinate themselves reliably — and scientists just found that a century and a half of crop breeding has quietly eroded that ability, while old Asian heirloom wheats still carry the genes to restore it.
Wheat flowers produce pollen to fertilize themselves and make seeds — the part we grind into flour. Scientists discovered that modern wheat varieties, bred over the last 150 years for bigger yields and shorter stalks, accidentally ended up with far less pollen than the ancient varieties farmers once grew. By comparing hundreds of wheat types and tracing the genetics, they pinpointed specific gene regions responsible, including some tied to the famous 'Green Revolution' that fed billions in the 20th century.
Key Findings
Modern wheat cultivars have significantly fewer pollen grains than landraces, with a measurable decline over the past 150 years of breeding history.
Green Revolution genes (Rht-B1, Rht-D1, Ppd-D1) — responsible for semi-dwarf, high-yield wheat — contribute to reduced pollen number and shorter anther length, though their individual effects are relatively minor.
Anther length is an unreliable proxy for pollen count: researchers identified at least one new QTL affecting pollen number that was invisible when measuring anthers alone, and vice versa.
chevron_right Technical Summary
Modern bread wheat varieties have steadily fewer pollen grains and shorter anthers than older landraces, a trend spanning 150 years of breeding. Researchers mapped the genes responsible and found underutilized Asian landraces carry variants that could reverse this decline.
Abstract Preview
The number of pollen grains, which carry male gametes in seed plants, has attracted interest in genetics, evolution, and breeding. Rapid evolutionary reductions in pollen number and anther length w...
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Common wheat, also known as bread wheat, is a cultivated wheat species. About 95% of wheat produced worldwide is this species; it is the most widely grown of all crops and the cereal with the highest monetary yield.