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Title: Production and use of epicormic shoots in clonal propagation of Betula pendula Roth and Acer pseudoplatanus L.
Author: Sani, Hamsawi B.
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1992
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A study of differences between juvenile and mature meristematic tissues of epicormic shoots of Betula pendula Roth and Acer pseudoplatanus L. was made and these differences were used as markers of juvenility and maturity. The percentage of isolated stem sections producing epicormic shoots and the number of shoots forming for both species decreased significantly with increasing tree age and original height of the stem sections on the tree bole; suggesting that the development of epicormic shoots follows the existing model of maturation controlled by the apical meristem. Ease of rooting appears to be the most consistent and reliable marker for determining juvenility and maturity, where the rooting capacity of cuttings collected from epicormic shoots decreased with ortet age and increasing height of the stem sections. Rejuvenation through epicormic shoot development only indicated partial success as demonstrated by plagiotropic growth, adult leaf morphology and delayed bud flushing in rooted cuttings from older genotypes, and the prominent problems of browning in tissue culture explants; suggesting that only the 'ageing' component has been affected. Ageing effects were also evident in rooting experiments with primary ramets and growth experiments using horizontally grown rooted cuttings. All rooted cuttings, however, showed the potential to recover from plagiotropism and resume orthotropic growth with time, although there was considerable variation among individuals, indicating that the development of epicormic shoots and subsequent rooting of these shoots as cuttings only partly agrees with the existing theory of maturation. The feasibility of using rooted cuttings derived from epicormic shoots from mature trees in current tree breeding and improvement programmes is discussed, while future research to enhance the understanding of phase change in woody species using epicormic shoots is recommended.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available