1,721,014 research outputs found
Crop wild relatives: know how past and present to improve future research, conservation and utilization strategies, especially in Italy: a review
No full textCrop wild relatives (CWR) have contributed to crop domestication for millennia, but nowadays due also to human over exploitation of plants and other environmental resources they are threatened and hence they need protection to guaranty plant evolution and food supply for future human generations. At the moment, definition and identification of CWR inside plant community is made according to the taxon group and the gene pool concepts, though in this way the effect of horizontal gene transfer (HGT) is ignored. A third concept considering the HGT could improve both definition and identification of CWR. The number of CWR identified by the taxon group concept (broad sense) is much larger than the one identified by the gene pool concept (narrow sense), which means that only a very small percentage of the CWR identified with the former concept can be used by breeders. The Italian flora consists of 7953 taxa. Analyzing the vascular plant database, only 113 species share all the gene pools and therefore can be considered CWR in the narrow sense. In Italy there are 1400 endemic vascular plants, of which 70 are CWR in the broad sense and 10 in the narrow sense. The status of in situ and ex situ conservation of CWR understood in the narrow sense is presented and discussed, stressing the point that conservation and utilization is not a scientific problem, but a political one. This point is supported by the “ecological economy” and “sustainable development” concepts, besides the human rights. Since at the moment, starvation is not due to shortage, but to bad distribution and waste of food, CWR relatives are more important for the conservation of biodiversity and as sources of genes to cope climate change than enhancing crop yield. The legislation that obstacles agrobiodiversity conservation and use should be changed and/or improved. Concluding, actions and proposal to shape the future existence, function and contribution of CWR to biodiversity and food security are indicated
Identificazione genetica di 3 varietà di farro dicocco Triticum turgidum L. subsp. Dicoccum (Schrank)
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Cytology of Vicia species. III. Characterization of the chromosomal chromatin of some species of the section Cracca.
No full textStudio floristico-vegetazionale finalizzato alla conservazione in situ ed ex situ di specie selvatiche a rischio in alcuni distretti dell'Italia meridionale ed alla salvaguardia dei relativi ecosistemi naturali
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