Laying of Wheat and other cereals is a particular case of Etiolation.
"Disease in Plants"
H. Marshall Ward
The seeds having been sown too thickly, the bases of the haulms, owing to the Etiolation and consequent lack of carbohydrates, suffer from want of stiffening tissues, and the top-heavy plants fall over.
"Disease in Plants"
H. Marshall Ward
False Etiolation depends on a similar abeyance of the chlorophyll, but in this case due to too low a temperature.
"Disease in Plants"
H. Marshall Ward