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While cytokinin action in vascular plants is described as pleiotropic, this class of plant hormones specifically induces the transition from apical growth to growth via a three-faced apical cell in moss protonema. This bud induction can be pinpointed to differentiation of a specific single cell, and thus is a very specific effect of cytokinin. [18]
NAA is a synthetic plant hormone in the auxin family and is an ingredient in many commercial horticultural products; it is a rooting agent and used for the vegetative propagation of plants from stem and leaf cuttings. It is also used for plant tissue culture. [2]
Willow water is a traditional method to extract the rooting hormone indolebutyric acid from willow (Salix) trees, which is believed to be present in sufficient quantities to stimulate root growth. [1] [2] [3] [4]
The simplest method of propagating a tree vegetatively is rooting or taking cuttings. A cutting (usually a piece of stem of the parent plant) is cut off and stuck into soil. Artificial rooting hormones are sometimes used to improve chances of success.
The process of callus to root formation is called indirect organogenesis whereas if roots are formed from the explant directly it is called direct organogenesis. [ 3 ] In a study of Camellia sinensis , the effect of three different auxins, IBA, IAA and NAA were examined to determine the relative effect of each auxin on root formation.
When raising multiple seedlings, the root trainers are commonly placed in trays or racks. The size of each trainer depends upon the species but, for broad-leaved trees, the capacity is about a cup . Vertical ribs inside the trainer are positioned to train the roots to grow downwards and so prevent root spiralling.
Thus, a plant can (as a whole) react to external conditions and adjust to them, without requiring a nervous system. Auxins typically act in concert with, or in opposition to, other plant hormones. For example, the ratio of auxin to cytokinin in certain plant tissues determines initiation of root versus shoot buds.
Due to their mechanism of action, these molecules have been classified as plant hormones or phytohormones. [1] So far, strigolactones have been identified to be responsible for three different physiological processes: First, they promote the germination of parasitic organisms that grow in the host plant's roots, such as Striga lutea and other ...
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