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Cavendish banana

life science Maturity 11-13 Next article →

The Cavendish banana is a specific group of banana cultivars. These are varieties of the plant species Musa acuminata. They belong to the AAA triploid cultivar group. Cavendish bananas are incredibly important for the global food system. They make up the vast majority of bananas traded internationally. Between 1998 and 2000, they accounted for 47% of all global banana production.

Most people recognize them from the fruit sold in grocery stores. They are used in many ways, such as being eaten raw or used in baking.

Watching a Cavendish banana ripen is a fascinating biological process. When the fruit is first harvested, the outer skin is partially green. As the fruit matures, the starch inside is converted into sugars. This chemical change is what makes the fruit taste sweet. During this time, the skin turns from green to yellow.

Green raw bananas
Green raw bananas

You can also induce this process using ethylene gas. This is a gas that bananas naturally emit as they ripen. As they turn yellow, they release sweet-scented esters. Eventually, the fruit reaches stage 7, where brown or black sugar spots appear. If the fruit becomes overripe, the skin turns black and the flesh becomes mushy.

Cavendish banana1
Cavendish banana1

There are several different types, or cultivars, within the Cavendish subgroup. These are often distinguished by the height of the plant or the features of the fruit. One major clone is the 'Grand Nain,' which is also known as the Chiquita banana. This is the most important clone for international trade. Another widely grown clone is the 'Dwarf Cavendish,' which was identified in 1888. Other recognized cultivars include 'Lacatan,' 'Poyo,' 'Valéry,' and 'Williams.'

Smallcavendish
Smallcavendish

Different scientific systems may group these cultivars in different ways. Some classifications include 'Extra Dwarf Cavendish' or 'Giant Cavendish.'

The history of the Cavendish banana is tied to 19th-century Europe. The bananas were named after William Cavendish, the 6th Duke of Devonshire. In 1834, the Duke received a shipment of bananas from Mauritius. His head gardener, Sir Joseph Paxton, grew them in the greenhouses of Chatsworth House. Paxton described the plants botanically as Musa cavendishii. He even won a medal at the 1835 Royal Horticultural Society show for this work.

Bananenblüte
Bananenblüte

By the 1850s, these plants were being shipped to various places in the Pacific. Some may have reached the Canary Islands, where bananas were also grown. In 1888, Thomas Fyffe imported bananas from the Canary Islands into England. These are now known to be the Dwarf Cavendish cultivar.

For a long time, the Cavendish was not the most famous banana. In the early 20th century, the Gros Michel variety was the dominant commercial banana. However, the Gros Michel was devastated by a fungal disease called Panama disease. This happened in the 1950s and changed the banana industry forever. The Cavendish became the new standard because it could grow in the same soils as the Gros Michel. Many people believed the Cavendish was resistant to Panama disease.

Cavendish DS
Cavendish DS

However, recent history shows that this resistance might not last.

The greatest threat to the Cavendish is its lack of genetic diversity. These plants are parthenocarpic, meaning they have no seeds. Because they cannot reproduce sexually, they are grown through cloning. This means every plant is an identical copy of the others. Because they are planted in dense monocultures, they have no natural buffer against sickness. This makes them extremely vulnerable to fungal outbreaks and genetic mutations. In 2008, reports showed that Panama disease was attacking Cavendish plants in Sumatra and Malaysia. In 2019, a specific version called Tropical Race 4 (TR4) was found in the Caribbean.

Green raw bananas
Green raw bananas

Scientists are now working hard to prevent the commercial extinction of the Cavendish. Because they rely on cloning, they evolve much more slowly than crops grown from seeds. This makes it difficult for them to develop natural resistance to diseases like Fusarium wilt. In 2017, a biotechnologist named James Dale created a transgenic banana. This was a genetically engineered version designed to resist Tropical Race 4. In 2023, agencies in the Philippines used pest control to fight Fusarium oxysporum f.sp. cubense. Protecting these plants is vital since they represent about 99% of banana exports to developed countries.

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File:Green raw bananas.jpg
Green raw bananas.jpg
File:Smallcavendish.jpg
Smallcavendish.jpg
File:Cavendish DS.jpg
Cavendish DS.jpg
File:Bananenblüte.JPG
Bananenblüte.JPG
File:Cavendish_banana1.jpg
Cavendish_banana1.jpg
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