1,721,015 research outputs found
Atti del Convegno di presentazione dei risultati del Progetto FLORE3.0 “Il florovivaismo mediterraneo: un sistema interagente per migliorare il posizionamento sui mercati”. Milis (OR), 9 marzo 2019
No full textAtti del Convegno di presentazione dei risultati del Progetto FLORE3.0 “Il florovivaismo mediterraneo: un sistema interagente per migliorare il posizionamento sui mercati”. Milis (OR), 9 marzo 201
Propagazione di specie diverse di ginepro (Juniperus spp.).
No full textVengono presentati i principali risultati di una ricerca svolta nelle aree interne della Sardegna per la caratterizzazione di accessioni di diverse specie di Juniperus candidate alla valorizzazione come piante ornamentali. Prove di propagazione per seme e per talea hanno dimostrato come questa’ultima tecnica sia più facilmente utilizzabile per tutte le specie studiate.The main findings of a survey conducted in the areas of Sardinia to characterize accessions of different species of Juniperus as candidate ornamentals are presented. Propagation by seed and by cuttings have demonstrated that this last technique is more readily usable for all species studied.Sont présentées les principales conclusions d’une recherche menée dans les zones intérieures de la Sardaigne pour caractériser les accessions de différentes espèces de Juniperus finalisée à la valorisation des candidats comme plantes ornementales. La multiplication par semis et par des coupes ont démontré que cette dernière technique est plus facilement utilisable pour toutes les espèces étudiées
Adaptability of species of thegenus Atriplexto different thermic regimes
Full text linkA very effective tool to combat desertification is rivegetation. Promising species for this purpose are the evergreen shrubs of thegenus Atriplex. The purpose of the research is to study the various physiological responses ofA. halimusto thermic stress and to select clones resistant to low temperatures. The test was conducted in 4 sites in Sardinia characterized by different environmental conditions. In every site five clones ofA. halimuswere compared. After a period of acclimatization, the growth of plants in terms of linear growth of the biomass was measured. In the same periods, the fresh and dry biomass amount per plant were determined, as well as the content of the main macro and microelements. Correlations between the index of cumulated cold (ICC), which consists of the sum of the degrees of differences between the average daily air temperature and the thresholds of critical temperatures of 0, 5 and 10 °C, and the various parameters were analyzed. Differences among the five clones, with regard to the influence of low temperatures on plant growth, on the production of biomass, and on accumulation of macro and microelements were evaluated. Among the five clones tested, the clone GIO1 and SAN3 resulted more sensitive to temperature. The clones MAR1, PAL1 and FAN3 resulted less sensitive to low temperatures and also in the site characterized by the lowest minimum temperatures have shown greater adaptability, and thus a positive growth
Caratteri di pregio per la selezione di cloni di Atriplex halimus L. di interesse ornamentale
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Cultivar selection from spontaneous populations of Atriplex halimus L.
No full textAtriplex halimus L. is a shrub spontaneously growing in the coastal areas of the Sardinia island. In the last years a specific research program was performed with the aim to localize the areas where the species grows spontaneously. Subsequently, individual shrubs were sampled to describe the main accessions of the species and to propagate the most significant natural phenotypic variability. In May of 2005 a survey was made throughout the littoral of Sardinia, which led to the collection and characterization of 30 accessions of A. halimus mainly from the areas South, West and North of the island. The clones were characterized by morphological description of the mother plant and then propagated by softwood cuttings taken from spring branches, a field collection of different accessions was also maintained as dry culture. Factors relating to the propagation of different clones, the general characteristics of plants and the phenotypic variability of clones, such as plant habit, leaf size and morphology, and time of flowering were recorded. Data analysis were useful to indicate, for each clone, the potential use as an ornamental cultivar or for other purposes. Comparative analysis of descriptor lists showed a relative low variability for the plant habit, while plant vigour and size, flowering abundance and fruit yield, as well as leaf size showed a strong variability among the described clones. The phenological behaviour showed variability associated to the different areas of origin of accessions
Influence of temperature on biomass production of clones of Atriplex halimus
No full textA very effective tool to combat desertification is
revegetation. Promising species for this purpose are the evergreen
shrubs of the genus Atriplex. The objective of the research
was to study the growing responses of Atriplex halimus
under different thermal regimes and to evaluate the biomass
accumulation of selected clones. The test was carried out in
four sites of Sardinia Island (Italy) characterized by different
latitude, altitude and air temperature trends along the year. In
every site, potted plants of five clones of A. halimus were
compared for biomass production as measured by linear
growth of plants (central axis and secondary shoots), as well
as by dry weight of leaves, shoots and roots per plant.
Correlations between sums of hour-degrees under or above
the thresholds of critical air temperatures, comprised between
0 and 35 °C, and the plant growth indicators were analysed.
Differences among the five clones, with regard to the influence
of low temperatures on plant growth and on the biomass
production were evaluated. Among five tested clones, GIO1
and SAN3 resulted more sensitive to low temperatures.
Clones MAR1, PAL1 and FAN3 resulted less sensitive to
low temperatures and in the site characterized by the lowest
minimum temperatures also have shown greater adaptability
and thus biomass growth in the observed period. The clone
PAL1 showed a lower shoot/root biomass ratio as adaptation
to cold temperature, and the clone FAN3, the opposite behaviour
and a general preference to temperate thermal regimes
Propagation of Opuntia ficus-indica by cladode fragments.
No full textAgamic propagation of Opuntia ficus-indica by cladode rooting allows a low rate of plant multiplication as compared with other woody plants. One-year-old cladode fragmentation is a possibility for obtaining many small cuttings having homogenous characteristics. However, some physiological characteristics of these cuttings are not well known, such as the relationship among tissue loss of water, storability, viability and rooting ability. One-year-old cladodes of the cultivar ‘Gialla’ were taken from plants growing in Sardinia in May. Cladodes were portioned into parallelepipeds of 10-12 cm3 volume always having at least two bud areolas in one of the bases. Average dry matter concentration of cladodes at the start of the experiment was around 8%. Cuttings were submitted to a drying treatment in a ventilated oven at 35°C for 72, 96 or 120 h. Cutting weight loss was, respectively, 30.7, 34.4 and 35.4% after these treatments. Dried cuttings were tested for rooting ability by deposition over a sandy substrate for 120 days under open-air conditions. In September, variation in fresh weight among the cuttings with respect to initial weight was recorded. Only rooted cuttings previously subjected to 96 h of drying treatment showed an increase in fresh weight, of 6.9%, while cuttings treated for 72 and 120 h, respectively, lost 18.8 and 24.8% of their fresh weight. Rooted cuttings comprised 85.7, 92.6 and 83.9% of all cuttings in the 72, 96 and 120 h treatments, respectively, with two roots per cutting recorded in all treatments. However, the cuttings treated for 96 h showed the highest root dry weight of 1.0 g, root mean length of 17.0 cm, and number of shoots per cutting of 0.45
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