What does collenchyma mean?
Collenchyma is a specialized plant tissue whose job is to lend flexible mechanical support to soft, actively growing parts of a plant such as young stems, petioles, and leaf stalks. Its cells are elongated and alive at maturity, distinguished by primary cell walls that are unevenly thickened — often at the corners where cells meet — which lets the tissue bend without snapping. This makes collenchyma different from parenchyma, the thin-walled tissue that fills much of a plant's body, and from sclerenchyma, whose tough, lignified cells are dead at maturity. The classic familiar example is the fibrous 'strings' in a celery stalk. The word is technical, appearing mainly in botany textbooks and research literature, but it captures an elegant idea: a plant can build scaffolding out of living material that keeps stretching as it grows. Its adjective form is 'collenchymatous'.
nounA type of living plant tissue composed of elongated cells with unevenly thickened primary cell walls, providing flexible structural support to growing stems, leaves, and other organs.
- A strengthening plant tissue of living elongated cells with unevenly thickened primary cell walls, found especially in the growing regions of stems and leaves.
"The collenchyma beneath the epidermis gives the young celery stalk its characteristic stringy flexibility."
"In cross-section, the collenchyma formed a distinct ring just inside the epidermis of the sunflower stem."
"Because collenchyma cells remain alive, they can continue to stretch and support tissues as the plant grows."
Rare; normally used as an uncountable mass noun. A plural appears occasionally when distinguishing different types or arrangements of collenchyma tissue.
"Botanists distinguish several collenchymas, including angular, lamellar, and lacunar forms."
That satisfying 'string' you peel off a celery stalk? That's collenchyma — living tissue doing strength work without ever dying on the job.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of collenchyma
Collenchyma comes from the Greek 'kolla', meaning glue, combined with 'enchyma', meaning an infusion or something poured in — a root it shares with its anatomical cousins parenchyma ('beside the infusion') and sclerenchyma ('hard infusion'). The term was coined in nineteenth-century botanical science as microscopists classified plant tissues by their cell-wall structure. Its Greek roots also surface in 'chyme' and 'chyle', terms from physiology describing semi-fluid substances.
Related word forms
How collenchyma is actually used
Strictly technical vocabulary used almost exclusively in botany and plant anatomy; it is unmarked in register within scientific writing but rare in everyday speech. It is a mass (uncountable) noun when referring to the tissue generally, though 'collenchymas' can occur when referring to distinct tissue types. The adjective form is 'collenchymatous'.
Easily confused with collenchyma
Parenchyma is thin-walled ground tissue involved in storage, photosynthesis, and transport, whereas collenchyma has unevenly thickened primary walls specialized for flexible support.
Sclerenchyma consists of dead cells with rigid, lignified secondary walls for rigid support, while collenchyma cells are alive with only thickened primary walls.