Melis, Rita Anna Maria (2010) Influence of enviromental and cultural factors on structure, conposition and aganic propagation of turo mediterranean scrubs (myrtus communis L. - Pistacia lentiscus L.). Doctoral Thesis.
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The crucial point for the exploitation of Mediterranean species for agronomic
purposes relies on the availability of planting material with high physiological
quality. As it is known, the plant propagation may be realized by seed or by asexual
or vegetative propagation. The latter has an unquestionable advantage for the
propagator because it allows obtaining plants that reproduce exactly the genetic and
morphological characteristics of the parent plant and, theoretically, it allows to obtain
a large number of individuals in a short time.
Among the various types of asexual propagation used in the nursery industry, cutting
propagation finds the greater application as it is technically easier to run and
economically profitable in respect to all possible alternative methods.
It would be advantageous to set up such propagation method for Mediterranean
shrubs that are difficult-to-root, on the one hand selecting superior genotypes and on
the other hand developing technical strategies for the improvement of donor
physiology and the rooting competence.
The environmental factors, irradiance above all, but also nutrient and water
availability in the substrate for growth, influence the physiological, hormonal and
nutritional status of stock plants and may influence the cuttings quality and their
rooting ability. The ontogenetic age of cutting may also influence the propagating
attitude of the species.
As regards myrtle and lentisk, few studies have been done concerning the influence
of stock plant physiology on rooting. Crobeddu and Pignatti (2005) studied the
rooting results of rejuvenated plants, many other Authors focused on
micropropagation but no considerations were done about the physiology of donors.
The primary objective of the present research was to enhance the use as ornamental
plants of two typical species of the Mediterranean environment, by means of the
optimization of nurseries cycles.
In particular, the study focused on physiological and morphological features
potentially related to adventitious rooting in myrtle and lentisk.
The specific objectives aimed at:
- Determining the influence of light availability and rejuvenation on the
morphological, chemical and ecophysiological features of mature plants
- Assessing the eventual influences on rooting
- Assessing the influence of intra-specific variability on propagation trials, with
the declared aim to look for genotypes offering an economically supportable
option to propagate the studied species.
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