Bast fibre (also called phloem fibre or skin fibre) is plant fibre collected from the

phloem Phloem (, ) is the living tissue in vascular plants that transports the soluble organic compounds made during photosynthesis and known as ''photosynthates'', in particular the sugar sucrose, to the rest of the plant. This transport process is ...

(the "inner bark", sometimes called "skin") or bast surrounding the stem of certain

dicotyledon The dicotyledons, also known as dicots (or, more rarely, dicotyls), are one of the two groups into which all the flowering plants (angiosperms) were formerly divided. The name refers to one of the typical characteristics of the group: namely, ...

ous

plant Plants are the eukaryotes that form the Kingdom (biology), kingdom Plantae; they are predominantly Photosynthesis, photosynthetic. This means that they obtain their energy from sunlight, using chloroplasts derived from endosymbiosis with c ...

s. Some of the economically important bast fibres are obtained from herbs cultivated in agriculture, for instance

flax Flax, also known as common flax or linseed, is a flowering plant, ''Linum usitatissimum'', in the family Linaceae. It is cultivated as a food and fiber crop in regions of the world with temperate climates. In 2022, France produced 75% of t ...

hemp Hemp, or industrial hemp, is a plant in the botanical class of ''Cannabis sativa'' cultivars grown specifically for industrial and consumable use. It can be used to make a wide range of products. Along with bamboo, hemp is among the fastest ...

, or

ramie Ramie (pronounced: , ; from Malay ), ''Boehmeria nivea'', is a flowering plant in the nettle family Urticaceae, native to eastern Asia. It is an herbaceous perennial growing to tall;

, but bast fibres from wild plants, such as

stinging nettle ''Urtica dioica'', often known as common nettle, burn nettle, stinging nettle (although not all plants of this species sting) or nettle leaf, or just a nettle or stinger, is a herbaceous perennial flowering plant in the family Urticaceae. Or ...

, and trees such as lime or linden,

willow Willows, also called sallows and osiers, of the genus ''Salix'', comprise around 350 species (plus numerous hybrids) of typically deciduous trees and shrubs, found primarily on moist soils in cold and temperate regions. Most species are known ...

oak An oak is a hardwood tree or shrub in the genus ''Quercus'' of the beech family. They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne within a cup. The genus is widely distributed in the Northern Hemisp ...

wisteria ''Wisteria'' is a genus of flowering plants in the legume family, Fabaceae (Leguminosae). The genus includes four species of woody twining vines that are native to China, Japan, Korea, Vietnam, southern Canada, the Eastern United States, and nor ...

, and

mulberry ''Morus'', a genus of flowering plants in the family Moraceae, consists of 19 species of deciduous trees commonly known as mulberries, growing wild and under cultivation in many temperate world regions. Generally, the genus has 64 subordinat ...

have also been used. Bast fibres are soft and flexible, as opposed to leaf fibres from

monocotyledon Monocotyledons (), commonly referred to as monocots, ( Lilianae '' sensu'' Chase & Reveal) are flowering plants whose seeds contain only one embryonic leaf, or cotyledon. A monocot taxon has been in use for several decades, but with various ranks ...

ous plants, which are hard and stiff. Since the valuable fibres are located in the phloem, they must often be separated from the woody core, the

xylem Xylem is one of the two types of transport tissue (biology), tissue in vascular plants, the other being phloem; both of these are part of the vascular bundle. The basic function of the xylem is to transport water upward from the roots to parts o ...

, and sometimes also from the

epidermis The epidermis is the outermost of the three layers that comprise the skin, the inner layers being the dermis and Subcutaneous tissue, hypodermis. The epidermal layer provides a barrier to infection from environmental pathogens and regulates the ...

. The process for this is

retting Retting is a process employing the action of micro-organisms and moisture on plants to dissolve or rot away much of the cellular tissues and pectins surrounding bast-fibre bundles, facilitating the separation of the fibre from the stem.retting ...

, and can be performed by micro-organisms either on land (nowadays the most important) or in water, or by chemicals (for instance high pH and

chelating Chelation () is a type of bonding of ions and their molecules to metal ions. It involves the formation or presence of two or more separate coordinate bonds between a polydentate (multiple bonded) ligand and a single central metal atom. These l ...

agents), or by

pectin Pectin ( ': "congealed" and "curdled") is a heteropolysaccharide, a structural polymer contained in the primary lamella, in the middle lamella, and in the cell walls of terrestrial plants. The principal chemical component of pectin is galact ...

olytic

enzyme An enzyme () is a protein that acts as a biological catalyst by accelerating chemical reactions. The molecules upon which enzymes may act are called substrate (chemistry), substrates, and the enzyme converts the substrates into different mol ...

s. In the phloem, bast fibres occur in bundles that are glued together by

and

calcium Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to it ...

ion An ion () is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by convent ...

s. More intense retting separates the fibre bundles into elementary fibres, which can be several centimetres long. Often bast fibres have higher

tensile strength Ultimate tensile strength (also called UTS, tensile strength, TS, ultimate strength or F_\text in notation) is the maximum stress that a material can withstand while being stretched or pulled before breaking. In brittle materials, the ultimate ...

than other kinds, and are used in high-quality

textile Textile is an Hyponymy and hypernymy, umbrella term that includes various Fiber, fiber-based materials, including fibers, yarns, Staple (textiles)#Filament fiber, filaments, Thread (yarn), threads, and different types of #Fabric, fabric. ...

s (sometimes in blends with cotton or synthetic fibres),

rope A rope is a group of yarns, Plying, plies, fibres, or strands that are plying, twisted or braided together into a larger and stronger form. Ropes have high tensile strength and can be used for dragging and lifting. Rope is thicker and stronger ...

yarn Yarn is a long continuous length of interlocked fibres, used in sewing, crocheting, knitting, weaving, embroidery, ropemaking, and the production of textiles. '' Thread'' is a type of yarn intended for sewing by hand or machine. Modern ...

paper Paper is a thin sheet material produced by mechanically or chemically processing cellulose fibres derived from wood, Textile, rags, poaceae, grasses, Feces#Other uses, herbivore dung, or other vegetable sources in water. Once the water is dra ...

composite material A composite or composite material (also composition material) is a material which is produced from two or more constituent materials. These constituent materials have notably dissimilar chemical or physical properties and are merged to create a ...

s and burlap. An important property of bast fibres is that they contain a special structure, the ''fibre node'', that represents a weak point, and gives flexibility. Seed hairs, such as cotton, do not have nodes.

Etymology

The term "bast" derives from

Old English Old English ( or , or ), or Anglo-Saxon, is the earliest recorded form of the English language, spoken in England and southern and eastern Scotland in the Early Middle Ages. It developed from the languages brought to Great Britain by Anglo-S ...

''bæst'' ("inner bark of trees from which ropes were made"), from

Proto-Germanic Proto-Germanic (abbreviated PGmc; also called Common Germanic) is the linguistic reconstruction, reconstructed proto-language of the Germanic languages, Germanic branch of the Indo-European languages. Proto-Germanic eventually developed from ...

*''bastaz'' ("bast, rope"). It may have the same root as

Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...

' ("bundle") and

Middle Irish Middle Irish, also called Middle Gaelic (, , ), is the Goidelic language which was spoken in Ireland, most of Scotland and the Isle of Man from AD; it is therefore a contemporary of Late Old English and Early Middle English. The modern Goideli ...

''basc'' ("necklace").

Use of bast fibre

Plants that have been used for bast fibre include

(from which

linen Linen () is a textile made from the fibers of the flax plant. Linen is very strong and absorbent, and it dries faster than cotton. Because of these properties, linen is comfortable to wear in hot weather and is valued for use in garments. Lin ...

is made),

jute Jute ( ) is a long, rough, shiny bast fibre that can be Spinning (textiles), spun into coarse, strong threads. It is produced from flowering plants in the genus ''Corchorus'', of the mallow family Malvaceae. The primary source of the fiber is ...

kenaf Kenaf tymology: Persian ''Hibiscus cannabinus'', is a plant in the family Malvaceae also called Deccan hemp and Java jute. ''Hibiscus cannabinus'' is in the genus ''Hibiscus'' and is native to Africa, though its exact origin is unknown. The n ...

kudzu Kudzu (), also called Japanese arrowroot or Chinese arrowroot, is a group of climbing, coiling, and trailing deciduous perennial vines native to much of East Asia, Southeast Asia, and some Pacific islands. It is invasive species, invasive in ...

, linden,

milkweed ''Asclepias'' is a genus of herbaceous, perennial, flowering plants known as milkweeds, named for their latex, a milky substance containing cardiac glycosides termed cardenolides, exuded where cells are damaged. Most species are toxic to huma ...

nettle Nettle refers to plants with stinging hairs, particularly those of the genus '' Urtica''. It can also refer to plants which resemble ''Urtica'' species in appearance but do not have stinging hairs. Plants called "nettle" include: * ball nettle ...

okra Okra (, ), ''Abelmoschus esculentus'', known in some English-speaking countries as lady's fingers, is a flowering plant in the Malvaceae, mallow family native to East Africa. Cultivated in tropical, subtropical, and warm temperate regions aro ...

paper mulberry The paper mulberry (''Broussonetia papyrifera'', syn. ''Morus papyrifera'' L.) is a species of flowering plant in the family Moraceae. It is native to Asia,ramie Ramie (pronounced: , ; from Malay ), ''Boehmeria nivea'', is a flowering plant in the nettle family Urticaceae, native to eastern Asia. It is an herbaceous perennial growing to tall;

, and roselle hemp. Bast fiber from oak trees forms the oldest preserved woven fabrics in the world. It was unearthed at the archeological site at

Çatalhöyük Çatalhöyük (English: Chatalhoyuk ; ; also ''Çatal Höyük'' and ''Çatal Hüyük''; from Turkish language, Turkish ''çatal'' "fork" + ''höyük'' "tumulus") is a Tell (archaeology), tell (a mounded accretion resulting from long-term huma ...

in Turkey and dates to 8000-9000 years ago. Bast fibres are processed for use in

carpet A carpet is a textile floor covering typically consisting of an upper layer of Pile (textile), pile attached to a backing. The pile was traditionally made from wool, but since the 20th century synthetic fiber, synthetic fibres such as polyprop ...

geotextile Geotextiles are versatile permeable fabrics that, when used in conjunction with soil, can effectively perform multiple functions, including separation, filtration, reinforcement, protection, and drainage. Typically crafted from polypropylene or ...

(netting or matting), traditional carpets, hessian or burlap,

, sacks, etc. Bast fibres are also used in the

non-woven Nonwoven fabric or non-woven fabric is a fabric-like material made from staple fibre (short) and long fibres (continuous long), bonded together by chemical, mechanical, heat or solvent treatment. The term is used in the textile manufacturing ind ...

, moulding, and composite technology industries for the manufacturing of non-woven mats and carpets, composite boards as furniture materials, automobile door panels and headliners, etc. From prehistoric times through at least the early 20th century,

bast shoe Bast shoes are shoes made primarily from bast—fiber taken from the bark of trees, such as linden. They are a kind of basket, woven and fitted to the shape of a foot. Bast shoes are a traditional footwear of the forest areas of Northeaster ...

s were woven from bast strips in the forest areas of Eastern Europe. Where no other source of

tanbark Tanbark is the Bark (botany), bark of certain species of trees, traditionally used for Tanning (leather), tanning Hide (skin), hides into leather. The words "tannin", "Tanning (leather), tanning", "Tan (color), tan," and "Tawny (color), tawny" a ...

was available, bast has also been used for tanning leather.

References

External links

Bast Fibre cords in Viking ships

{{Use dmy dates, date=October 2017 Fiber plants Plant anatomy Natural materials Reinforcement fibers