Fiber Plants Vascular Cells Cellulose Fibers Plant Fibers

Fiber Plants

Vascular Cells

Cellulose Fibers

Plant Fibers • The cell wall of the fiber cells – which is what gives them their properties of strength and elasticity – are mostly cellulose, although there may also be lignin, tannins, gums, pectins and other polysaccharides present • The most valuable fibers (for human use) are those that are nearly pure cellulose and white – cellulose is an extremely strong material, with tensile strength (resistance to tearing) that is equal to that of steel – fibers with much lignin are usually of poorer quality and are typical not as strong and more brown in color

Classifying Fibers • • • Fibers can be classified according to their use – Fibers used to make cloth are textile fibers Fibers to make rope are cordage fibers Fibers used as stuffing are filling fibers Natural fibers are made of plant or animal materials – mineral fibers are made from things like asbestos • Animal fibers like wool or silk are mostly protein while plant fibers are mostly cellulose • Some synthetic fibers are made up from natural materials – rayon is made from cellulose wood pulp

Classifying Fiber II • Plant fibers can also be classified by where they occur on the plant – • Surface fibers are found on the outer layers of leaves, seeds or fruits – cotton is made from seed hairs covering the surface of cotton seeds • Bast or soft fibers are clusters of phloem fibers found in the inner bark of some dicot stems – linen and ramie are both bast fibers • Hard fibers or leaf fibers are produced from the vascular bundles or veins in leaves – they are usually made up of both xylem and phloem and surrounding sheath fibers and cells – these usually come from monocot leaves – sisal and Manila hemp are examples • Hard fibers usually have a higher lignin content than soft fibers

Cotton

Early History of Cotton Use • Cotton was one of the first fiber plants to be domesticated by humans – its use originated in two different parts of the world with at least 4 different species being regularly used • Cotton was harvested from the wild in coastal areas of Peru about 10, 000 YA and was domesticated there by 4500 YA – from there its use spread and it was grown and used by native peoples in the American Southwest • In the Old World cotton cloth has been dated back 5000 YA – it was first grown on the Indian subcontinent and its use spread westward to Assyria, Babylonia, Persia (modern day Iraq and Iran) and then to Greece and Rome (although Greeks and Romans preferred to use linen)

More Cotton History • Cotton was especially well developed by Muslim peoples in the Near East in the 9 th and 10 th Centuries and the term muslin for a fine cotton cloth reflects that history • Old World cotton was introduced to Florida in 1556 and it was grown in Virginia beginning in 1607 – within 100 years, cotton was the most important crop in the southern American colonies • Cotton was at first a minor source of cloth in Europe until the 18 th century when Peruvian varieties were introduced – they had longer seed hairs which allowed for better spinning into cloth • Major cotton producing countries are China, US, India, Pakistan, former Soviet nations

Cotton Production

Gossypium hirsutum – upland cotton

Cotton Species • The old world cottons are diploid species that produce short fibers – G. herbaceum appears to have come from southern Africa and gave rise to G. arboretum in India; • The new world cottons are tetraploids that produce long fibers – they may have arisen as a cross between G. herbaceum and G. raimondii from Peru - how herbaceum got to Peru is not clear • G. hirsutum is the mostly commonly grown cotton in the world – it is often known as upland cotton and probably arose in Central America or Mexico; G. barbedense originated in the Andes of Peru and is the oldest used form of cotton

Cotton Genetics

Cotton Gin

Cotton Boll – Ready to Harvest

Cotton Bollworm

Use of Bt Cotton in South Africa

Traditional Cotton Harvest

Modern Cotton Harvest

Cotton Modules

Organic Cotton Production

Flax - Linum usitatissimum

History of Flax Use • Linen may be the oldest fabric made from plant fibers – Linen is made from flax Linum usitatissimum – the stem fibers of flax, an annual plant, have been made to make fabric for at least 10, 000 years – flax fibers have been found at sites of Swiss lake dwellers • Flax was also used in Mesopotamia, Assyria, and Babylonia • Egypt developed a very extensive and sophisticated use of flax – Egyptian linens dating back to 6500 YA have been found – Egyptians used linen for clothing for priests and royalty, to wrap mummies and exported to other countries for use in making sails

Pleistocene Swiss Lake Village

More Flax History • Ancient Greeks and Romans grew some flax • There is even evidence of use of flax in prehistoric American Southwest • Flanders (part of Belgium) became a major European center for growing flax, Ireland was also a center for flax growing • Today linen is used for only about 2% of the world’s textiles

Flax Cultivation • Two types of flax are grown – one for its seed oil (linseed oil) and one for fibers – flax for fiber is unbranched and grows to about 1 m tall • Flax is a soft bast fiber composed of phloem cell bundles – each flax stem typically contains about 15 -40 fiber bundles – • Fibers are preserved by pulling the plants up by the roots either by hand or with a special machine • Flax is gathered into bundles, left in the field to dry

Egyptian Flax Harvest

Flax Harvest – Ireland 1948

Preparing Linen Fibers • Linen is prepared by retting the stems – allowing microbes to ferment on them – this can be done by letting the stems sit in dewy conditions (4 to 6 weeks), putting them in ponds (about 2 weeks) or in tanks of warm water (a few days) • Retted fibers are dried and then broken (pounded) to free the fiber from the stem • Flax is then often bleached in the sun or by chemicals

Dew Retting Flax

Linen Fibers

Linen Thread

Linen Fabric

Hemp – Cannabis sativa

Hemp Fabric

History of Hemp Fabric • Hemp has long been a traditional source for fiber for rope and clothing and even for paper • Hemp fibers were used to make fabric as long ago as 8000 BCE - the fibers are so strong that hemp was woven to make ship’s sails from the 5 th century BCE until the mid-19 th century • Hemp was the major source of fiber for paper until 1883, when wood pulp replaced it

Chinese guide to making hemp fabric - 1872

Hemp traditionally used in sailing

More Hemp History • Hemp paper was used to produce Bibles from the first Gutenberg Bible to the King James Bible • Thomas Jefferson grew hemp for fiber; Thomas Paine’s pamphlets were printed on paper made from hemp fiber; the first and second drafts of the Declaration of Independence were written on hemp paper imported from Holland • Hemp was commonly used to make cordage, lighting oil, building materials, and now even plastic pipe has been made from hemp • During WW 2, many farmers in the Midwest grew hemp for fiber for ropes (cordage)

Hemp Paper

Hemp Declaration of Independence

Abaca or Manila hemp – Musa textilis

Manila hemp

Manila hemp rope

Modern Uses of Cannabis Hemp

Hemp Cultivation

Modern Hemp Paper

Hemp clothes and fabric

Hemp Cordage

Hemp Seed – Food and Oil

Hemp Cosmetics

Plants and Human Culture • “Nowhere has the effect of the use of plants on human culture been more dramatic than in their use to manufacture sea craft that transport people and their crops across vast stretches of the ocean” - Michael Balick and Paul Cox

Why study plants of Polynesia? • In all traditional cultures the relationships of plants and people are reciprocal and dynamic • In traditional societies, most plant products are collected, produced and consumed locally • A variety of Plants allowed Polynesians to become especially successful sailors

Long Ocean Voyages by Humans • Erik the Red journeyed 800 miles from Iceland to discover Greenland; his son Leif Eriksson went farther sailing nearly 2000 miles from Greenland to an area he called Vinland, which we know as a part of Newfoundland in Canada • Polynesians would commonly travel the 422 miles from Fiji to Tonga or 769 miles from Fiji to Samoa; Samoa to Tahiti (1059 miles) was not unheard of; the longest trips were from Tahiti to Hawaii (2700 miles) such trips did not occur often, but occurred often enough to populate almost all habitable islands in the Pacific and to allow trade and exchange of culture across the Pacific

Polynesian Islands

Polynesian Migrations

Tahiti with sailing canoes and other ships – painted in 1773 by William Hodges with Capt. Cook’s expedition

Boats on Island of Kabara • The Camakau (thah-mah-cow) which is a singlehulled canoe of up to 15 meters in length and used in inter-island transport and warfare • The Drua (ndrro-ah) which has two hulls and requires up to 50 men to sail it • The Tabete (tahm-bay-tay) which is the largest of all Fijian sea craft with an intricate hull of fitted planks that could be up to 36 m long and 7. 3 m wide - these vessels could transport up to 200 men, sail at 20 knots