If the chemical was distributed unevenly, the coleoptile curved away from the side with the cube, as if growing towards light, even though it was grown in the dark.
12.
The disease is initiated when soil-borne, or in particular seed-borne, teliospores germinate in response to moisture and produce hyphae that infect germinating seeds by penetrating the coleoptile before plants emerge.
13.
The plumule is covered with a "'coleoptile "'that forms the first leaf while the radicle is covered with a "'coleorhiza "'that connects to the primary root and adventitious roots form from the sides.
14.
The seeds of corn are constructed with these structures; pericarp, scutellum ( single large cotyledon ) that absorbs nutrients from the endosperm, plumule, radicle, coleoptile and coleorhiza these last two structures are sheath-like and enclose the plumule and radicle, acting as a protective covering.
15.
In the Preface to the Da Capo Press Edition of the original book, Pickard asserts that " If asked to choose the scientific report which most clearly marks the beginning of the modern study of plant growth, a great many botanists would select Charles Darwin's " The Power of Movement in Plants " . " She reviews the influence of Darwin's techniques here on later research by Boysen Jensen, Frits Went, and others that ultimately led to the discovery of auxin as the growth principle and notes that Darwin pioneered the use of the coleoptile ( which in Darwin's time was called a cotyledon ) in plant growth studies.
