Search results for " breeding"

Identification of self(in)compatibility genotypes and microsatellite marker based fingerprinting of traditional italian sweet cherry accessions

2012

Italy is one of the main European sweet cherry producers and it has a rich germplasm, including many minor local varieties that have not been well studied or used in breeding programmes. Sweet cherry is self-incompatible, with few exceptions; its incompatibility is controlled by a multi-allelic S locus, which is gametophytically expressed. The knowledge of S-alleles and cross-incompatibility groups of sweet cherry genotypes and cultivars is important for growers and breeders. In this work we analysed 48 traditional sweet cherry varieties and cultivars, mainly from Calabria and Emilia Romagna regions, together with eight Sicilian cultivars and the standard set of reference genotypes proposed…

BIOLOGY OF THE WREN, TROGLODYTES TROGLODYTES, IN A MEDITERRANEAN INSULAR AGROECOSYSTEM

2009

In the last years many species of birds have exploited urban and suburban habitats, taking opportunistically advantage of human presence for their niche parameters. The Wren is one of them and shows a high variability in the choice of nesting sites in the gardens of the outskirts of Palermo (Sicily). For many years the authors studied the breeding habits of this small bird, and thanks to the video-tape recordings on the nests, they were able to gather new information on its feeding habits and parental care. They could establish the role played by both parents, the different prey types carried to the chicks, and other data, scarcely known in the southern part of distribution of this passerin…

Utilizzo dell’embriogenesi gametica per il miglioramento genetico dei Citrus.

2013

Ottenimento di triploidi mediante coltura in vitro di semi di Citrus clementina Hort. ex Tan., cv. Monreal Bianco e Monreal Verde.

2011

STUDY ON GAMETIC EMBRYOGENESIS VIA IN VITRO ANTHER AND ISOLATED MICROSPORE CULTURE IN FRUIT CROPS

2014

Fruit breeding is mainly based on both conventional (hybridization, mutation and selection) or biotechnological methods (somatic hybridization, genetic transformation and haploid production). The genetic improvement through the conventional methods is limited by many factors such as fruit trees long juvenile period, high heterozygosity, large size and sexual incompatibility. Haploids and doubled haploids, obtained through gametic embryogenesis have a potential use in fruit crops genetic improvement. The change of the microspores fate from the normal gametopytic pathway towards the sporophytic induction is affected by numerous factors. Genotype, medium composition and stress were considered …

La biodiversità delle formazioni naturali e seminaturali in Sicilia: cambiamenti e ipotesi di gestione

2009

A large part of the natural formations that occupied the surface of Sicily have disappeared because of heavy transformations beginning from the ancient time. These transformations have provoked the disappearance of entire communities plants and animals but the entity of these modifications can be only partially appreciated or assumed on the base of fragmentary data. Scope of this study is to evaluate changes in plant and animal communities in the course of the centuries. Until the end of the nineteenth century on the whole an equilibrium was established in the Island. The agricultural activity had surely changed the proportions of the habitats contributing to the spread of open spaces commu…

Reproductive characteristics and differential response to seasonal temperatures of Blue and Great Tits (Cyanistes caeruleus & Parus major) in three n…

2011

The breeding ecology of the Blue Tit (Cyanistes caeruleus) and Great Tit (Parus major) was studied for 18 years in three different neighbouring habitats in Sicily, comprising oakwoods, reforested pine and a reforested mix of pine and broad-leaved trees. Both Blue and Great Tits laid eggs up to two weeks earlier in oakwoods than in the reforested areas. Our results indicate a statistically greater breeding success for both species in the oakwoods compared to reforested habitats, with the mixed reforested habitat having a greater success than that of reforested pine habitat. We also correlated reproductive characteristics with local air temperature to verify if the laying date of tits advance…

Effet du système d’élevage et de la technologie fromagère sur les caractéristiques sensorielles du fromage Caciocavallo Palermitano.

2012

Flower and fruit structure of the endangered species Petagnaea gussonei (Sprengel) Rauschert (Saniculoideae, Apiaceae) and implications for its repro…

2015

Petagnaea gussonei (Apiaceae) is an endangered species endemic to the Nebrodi mountains (north-eastern Sicily). Although an increasing number of studies have been performed on this species, its reproductive biology remains poorly understood. The aim of this study was to investigate in detail the structure of the flower and the fruit of Petagnaea, and the possible implications for its breeding system and seed dispersal mechanism. Results from fieldwork, light microscopy and scanning electron microscopy suggest (1) the presence of protandrous hermaphrodite flowers; (2) geitonogamy, autogamy, and allogamy as breeding system mechanisms of P. gussonei, even if asexual reproduction is preferred b…

Passero Passer italiae x hispaniolensis nidificante su barca da pesca in Sicilia

2022

This short note reports the curious breeding, in terms of nest features, of several Sparrows mainly showing the phenotype of the Spanish Sparrow or Passer prope hispaniolensis, though, few males exhibited less barred flanks as for the Passer italiae. This is in agre- ement with the ambiguous taxonomy of Sparrows of Sicily that is emerged over the past 150 years. As matter of fact, the taxonomic classification of the Sicilian sparrow spans from Passer hispaniolen- sis to Passer italiae and includes hybrid species in between. Massa et al (2022) propose to name these populations Passer italiae x hispa- niolensis. Here, for the first time, the curious nesting of Passer prope hispa- niolensis on…