the Ecological role of phytochrome. Growth under foliage bed curtains

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Light, passing through green sheet, as a result of selective absorption of waves of certain length by a chlorophyll rather it is enriched by beams of distant red area in comparison with the red. it interferes with germination of the seeds sensitive to light, after development of sheet bed curtains. As germination in such environment with light lack would lead to bad growth, the suppression of germination caused by absence of Fdk, matters for a survival. Next spring before development of sheet bed curtains seeds can sprout and sprouts will well develop.

Zatenenie green leaves influences and growth of sprouts. As phytochrome is in sprouts of the bottom circle mainly in the form of Fk, growth of the plants shaded by sheet bed curtains to a certain extent is similar to growth etiolirovannyh sprouts underground: leaves at them small and thin, stalks are unusually extended. as they spend a considerable part of the power resources for the processes conducting to lengthening of a stalk, plants of the bottom circle raise the ability to reach sheet bed curtains and to get through it; this known advantage in a competition as at zatenenii they receive very poorly radiant energy for photosynthesis. Apparently, it is not casual peaks of absorption of Fk and a chlorophyll and coincide, while the peak of absorption of Fdk gets in ' a window ' between short waves which are absorbed by photosynthetic pigments, and the long waves absorbed by water, containing in vegetative fabrics. The nature used this situation in the numerous difficult ways