Cellular, Biochemical and Molecular Characteristics Related To Maturation and Rejuvenation In Woody Species
In the development of all woody plants from seed there is a so-called juvenile phase lasting up to 30–40 years in certain forest trees, during which flowering does not occur and cannot be induced by the normal flower-initiating treatment or conditions. In time, however, the ability to flower is achieved and maintained under natural conditions; at this stage, the tree is usually considered to have attained the adult or mature condition. The transition from the juvenile to the mature phase has been referred to as phase change by Brink (1962), ontogenetic aging by Fortanier and Jonkers (1976), or meristem aging (cyclophysis) by Seeliger (1924) and Oleson (1978). Associated with this transition are progressive changes in morphological, developmental, and physiological characteristics. Changes in such characteristics during development vary from species to species. Most change gradually during the period preceding the mature phase, resulting in transitional forms. Usually no distinct change in any one characteristic is apparent at the time the ability to flower is attained.
KeywordsMature Leaf Anthocyanin Accumulation Mature Phase Adventitious Root Formation Juvenile Phase
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