AY Honors/House Plants/Answer Key

Template:Otheruses4 Layering is a means of plant propagation in which a portion of an aerial stem grow roots while still attached to the parent plant and then detaches as an independent plant. Layering has evolved as a common means of vegetative propagation of numerous species in natural environments. Layering is also utilised by horticulturists to propagate desirable plants. The term Layering also refers to a process when altering digital images such as digital photographs as used in the computer program that operates on Microsoft Windows XP, called PhotoImpress.

Natural layering typically occurs when a branch touches the ground, whereupon it produces adventitious roots. At a later stage the connection with the parent plant is severed and a new plant is produced as a result.

The horticultural layering process typically involves wounding the target region to expose the inner stem and optionally applying rooting compounds. In ground layering, the stem is bent down and the target region buried in the soil. This is done in plant nurseries in imitation of natural layering by many plants such as brambles which bow over and touch the tip on the ground, at which point it grows roots and, when separated, can continue as a separate plant. In either case, the rooting process may take from several weeks to a year.

Layering is more complicated than taking cuttings, but has the advantage that the propagated portion can continue to receive water and nutrients from the parent plant while it is forming roots. This is important for plants that form roots slowly, or for propagating large pieces.

Ground layering

Ground layering is the typical propagation technique for the popular Malling-Merton series of clonal apple rootstocks in which the original plants are set in the ground with the stem nearly horizontal, which forces side buds to grow upward. After these are started the original stem is buried up to the tip. At the end of the growing season, the side branches will have rooted, and can be separated while the plant is dormant. Some of these will be used for grafting rootstocks, and some can be reused in the nursery for the next growing season's crop.

Air layering

In air layering (or marcotting), the target region is wounded and then surrounded in a moisture-retaining wrapper such as sphagnum moss, which is further surrounded in a moisture barrier such as polyethylene film. Rooting hormone is often applied to encourage the wounded region to grow roots. When sufficient roots have grown from the wound, the stem from the parent plant is removed and planted.

Photographic Layering

Photo layering is the process a programmer uses to allow users to alter images saved on a computer. When a image is recorded digitally a specific amount of memory is first allocated, in the memory, to hold the digital information (data) needed to form the image, by the program that governs the process. After the image is saved this file size is published together with the image. That means to show the 'photo' on a computer, the computer also shows the file size. To alter this image the program used firstly holds the original image, then creates a skin, or layer,of equal size to hold the alterations. So to save the new (altered) image on the computer, The original image data and the new layer data are saved together and the file size increases considerably but does not double, as the control information is not duplicated. This fact alone should allow the courts to reconsider their attitude on electronic data when the imaging device and associated programs are together handed in as evidence. --82.22.1.65 (talk) 21:14, 18 March 2008 (UTC)

External links

• Information and illustrated step-by-step instructions for air layering