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Presentazione di varietà di mirto (Myrtus communis L.) selezionate per la produzione di frutti e biomassa
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Flower removal time and fruit quality in cactus pear (Opuntia ficus-indica Mill.)
No full textTo understand the influence of "scozzolatura", or first flower removal, and, in particular, of flower removal time on fruit quality, a two-year experiment was performed in a commercial orchard of 'Gialla' cactus pear cultivar. Plants were 30 years old, unwatered and trimmed to bush shape. The orchard was located at Sarroch, in Southern Sardinia.
Three groups of ten plants each were arranged, where early flowers were removed on the Ist of June, on the 20th of June and on the 10th of July. Ten plants were left undisturbed to provide control fruit. Flower removal delayed fruit ripening by about two, three and five months respectively for the first, second and third date of pruning.
The following quality parameters were observed in control and late-ripening fruit: mean weight and volume; pulp and peel color; fruit firmness; peel thickness and relative weight of peel, pulp and seeds; pulp acid, sugar and total soluble solid content. The latest ripening fruit showed greater weight and firmness, and relative weight of seeds, but also lower fruit color, sugar and total soluble solid content compared to control fruit. Fruit yielded after the first and second blossom removal appeared to have the best quality characters
Study, collection and characterization of oleaster genetic resources
No full textWild olive populations spread in many of the Mediterranean regions. In Sardinia Island, however, the oleaster (Olea europaea var. sylvestris) provides a reserve of genetic resources, both as a component of Mediterranean maquis and in the form of very old trees. Sometimes the two characters are combined in very old woods of oleaster which represent an original expression of the plant potential. With the aim to observe the natural colonization of oleaster in Sardinia a research program started in 1995. Some mother plant for a preliminary in situ description was subsequently selected, and shoots were sampled in order to find a morphologic and biometric description. Fruit bearing shoots were also sampled to perform agamic (softwood cuttings) and gamic (mature seeds) propagation of accessions. About one hundred accessions were selected, described and tested for propagation. As a result of this field observation, an ex situ collection of 30 accessions, mostly agamically propagated, was planted in 1998 in the experimental farm of the University of Sassari located in Oristano (Central Western Sardinia). The repository was the source of new data to complete the primary characterization of the accessions, like leaf, fruit and inflorescence morphology and biometry. More information was also obtained on flower biology, phenology and some agronomically relevant characters, like fruit composition. The dynamic of cambium activity, continuously observed for some years showed a significant stop of the tree growth between January and February and the lack of a similar stop during the summer. The wild population was analyzed for genotype characteristics, as compared with the regional olive germplasm by mean of different kinds of molecular markers (AFLP and SSR) and also compared with other wild population from other Mediterranean regions. These investigations have not demonstrated a relationship between wild population and olive germplasm in Sardinia and even if the introgression of cultivated genotypes in the wild population is realistically possible, the wild population, selected following our preliminary targets, showed a relative distance from the cultivated olive
Blossoming and fructification cycle of Opuntia ficus-indica Mill. in the mediterranean environment
No full textDescrittori per la caratterizzazione delle risorse genetiche del mirto (Myrtus communis L.)
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