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Barley

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Barley is a vital cereal grain belonging to the grass family, known scientifically as *Hordeum*.

Illustration Hordeum vulgare1
Illustration Hordeum vulgare1

It is a major global crop grown primarily in temperate climates. People value barley for its incredible versatility in food and industry. It serves as a foundation for many diets and a key ingredient in various products. This grain is one of the most important crops for feeding both humans and livestock. Its ability to grow in difficult conditions makes it a reliable resource for farmers worldwide.

Growing barley involves specific botanical processes and environmental needs. The plant features flowers arranged in clusters of spikelets that form a herringbone pattern. Each spikelet has a long, thin part called an awn, which gives the ears a tufted appearance.

Illustration Hordeum vulgare1
Illustration Hordeum vulgare1

To grow well, barley requires full sunshine and well-drained soil. It prefers relatively low temperatures during its growing season. While it is quite tolerant of drought and soil salinity, it is not as hardy in winter as rye or wheat. Farmers must also manage pests, such as aphids and caterpillars, and fungal diseases like barley rust. When the stems and ears turn yellow and begin to droop, the crop is ripe for harvest.

There are distinct types of barley categorized by their structure. In two-row barley, only the central spikelet in each cluster of three is fertile. In six-row barley, a mutation in a gene called *vrs1* allows all three spikelets to be fertile.

Illustration Hordeum vulgare1
Illustration Hordeum vulgare1

This difference affects the kernel shape and enzyme content. Brewers in Europe often prefer two-row cultivars, while North American breweries frequently use six-row varieties. Another type is hulless barley, also called "naked" barley. This variety has an easier-to-remove hull, which increases digestibility for animals like pigs and poultry. It can also provide higher protein and more beta-glucan.

History shows that barley was one of the first grains domesticated by humans. This process began in the Fertile Crescent around 9,000 BC.

Genetic analysis on the spread of barley from 9000 to 2000 BCE
Genetic analysis on the spread of barley from 9000 to 2000 BCE

Wild barley had a brittle spike that caused seeds to shatter and disperse easily. Domestication selected for a mutation in the *Bt1* and *Bt2* genes, resulting in nonshattering spikelets. This change made the grain much easier for humans to harvest. By 2,000 BC, barley had spread throughout Eurasia. It has been a staple in many regions, such as the Korean Peninsula and Tibet, for thousands of years.

Global production numbers highlight the massive scale of barley farming. In 2023, barley was the fourth most produced grain, with 146 million tonnes grown worldwide.

barley production, World, 2023 (cropped)
barley production, World, 2023 (cropped)

In 2024, production reached 142 million tonnes. Russia led the world in production, accounting for 12 percent of the total. The use of the grain is divided into two main categories. Approximately 70 percent of global production is used as animal feed.

LPCC-467-Pinso amb farina d'ordi, granulat
LPCC-467-Pinso amb farina d'ordi, granulat

The remaining 30 percent is used for human food or as fermentable material for beer and whisky.

Barley has many notable cultural and historical connections. In ancient Mesopotamia, the stalk of barley served as a symbol for the goddess Shala.

Issue of barley rations
Issue of barley rations

In Tibet, barley has been a staple since the fifth century AD, where it is made into a flour called tsampa. English folklore even features a character named John Barleycorn, who personifies the grain. The word "barn" actually comes from the Old English word *bere-aern*, meaning a barley store.

Barley Barn (cropped)
Barley Barn (cropped)

You can even see its influence in English pub names like The Barley Mow.

Modern science has allowed us to understand barley at a molecular level. In 2012, the International Barley Genome Sequencing Consortium successfully sequenced the barley genome.

Genetic analysis on the spread of barley from 9000 to 2000 BCE
Genetic analysis on the spread of barley from 9000 to 2000 BCE

The genome consists of 5,000 Mbp and is organized into seven pairs of nuclear chromosomes, labeled 1H through 7H. It also includes one mitochondrial and one chloroplast chromosome. This genetic knowledge helps scientists study how barley relates to other grasses like wheat and rye. Understanding these complex relationships helps ensure the grain remains a stable food source for the future.

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🖼️ Images & Media (7)
File:Barley Barn (cropped).jpg
Barley Barn (cropped).jpg
File:Illustration Hordeum vulgare1.jpg
Illustration Hordeum vulgare1.jpg
File:Genetic analysis on the spread of barley from 9000 to 2000 BCE.jpg
Genetic analysis on the spread of barley...
File:Issue of barley rations.JPG
Issue of barley rations.JPG
File:barley production, World, 2023 (cropped).svg
barley production, World, 2023 (cropped).svg
File:barley yields, World, 2023 (cropped).svg
barley yields, World, 2023 (cropped).svg
File:LPCC-467-Pinso amb farina d'ordi, granulat.jpg
LPCC-467-Pinso amb farina d'ordi, granulat.jpg
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