avena curvature test is bioassay for examining the activity of

1. auxins
2. gibberellins
3. cytokinins
4. ethylene

In 1926, a graduate student from Holland by the name of Fritz Went published a report describing how he isolated a plant growth substance by placing agar blocks under coleoptile tips for a period of time then removing them and placing them on decapitated Avena stems (Went, 1926). After placement of the agar, the stems resumed growth (see below). In 1928, Went developed a method of quantifying this plant growth substance. His results suggested that the curvatures of stems were proportional to the amount of growth substance in the agar (Went, 1928). This test was called the avena curvature test. Much of our current knowledge of auxin was obtained from its applications. Went's work had a great influence in stimulating plant growth substance research. He is often credited with dubbing the term auxin.

Avena coleoptile curvature test (परकुरचल वकता परीक्षण ) F.went (1926) published that how isolated a plant growth substance, by placing agar blocks (gelatinous material derived from algae specific used as culture medium of bacteria) ,under coleoptile tips (a sheath protecting a young shoot tip in a grass or cereal ), for a period of time then removing them and place them on decapitated Avena stem . After placement of agar the stem resume growth . F. Went later (1928) discovered a method of quantifing this plant growth substance . At final he observed that the curvatures of stems were proportion to amount of growth substance in the agar.