Browsing by Author "Abreu, Ivo"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- Evaluation of the maize (Zea mays L.) diversity on the Archipelago of MadeiraPublication . Carvalho, Miguel Ângelo A. Pinheiro de; Ganança, José Filipe Teixeira; Abreu, Ivo; Sousa, Nélia F.; Santos, Teresa M. Marques dos; Vieira, Maria Rita Clemente; Motto, MarioThe variability of 43 open-pollinated populations of maize (Zea mays L.), representing a wide range of ecological conditions on the Archipelago of Madeira, was evaluated based on the morphological and reproductive traits. Individual data of 41 traits related to earliness, plant and tassel structure and the shape of the ear and grain were analysed using multivariate analysis. The populations belonging to two major maize varieties were grouped into four groups by their degree of dissimilarity, based on discriminant analysis. The dissimilarity of these groups was confirmed by the values of the Tukey test. The racial rank of these groups was proposed and a brief description of the maize landraces was presented. This work represents the first morphological characterization and analysis of diversity of maize germplasm for the Archipelago of Madeira where the traditional agricultural practices are still keeping this Portuguese region free from corn hybrids. The description of the Madeiran corn landraces allows us to preserve the existing corn biodiversity and could be used for their registration as conservation landraces or for conservation and breeding proposes worldwide.
- Factors contributing to the development of aluminum resistance in the Madeiran maize germplasmPublication . Carvalho, Miguel Â. A. Pinheiro de; Slaski, Jan J.; Abreu, Ivo; Ganança, Filipe T.; Santos, Teresa M. M. dos; Freitas, Lurdes; Vieira, Maria R. Clemente; Nunes, Antonieta; Domingues, Ana; Taylor, Gregory J.
- Identification of aluminum resistant genotypes among Madeiran regional wheatsPublication . Carvalho, Miguel Â. A. Pinheiro de; Slaski, Jan J.; Santos, Teresa M. M. dos; Ganança, Filipe T.; Abreu, Ivo; Taylor, Gregory J.; Vieira, Maria R. Clemente; Popova, Tatyana N.; Franco, EmanuelForty-eight genotypes representing wheat diversity from the Island of Madeira were screened for resistance to aluminum (Al) in nutrient solution. Seeds of wheat used in the experiments were obtained from local farmers. The soil pH and content of ionic Al of plots cultivated with wheat were analyzed. The pH of topsoils varied between 3.83 and 6.59. The amount of ionic Al in soil samples varied between 0.38 and 1.36 cmol Al3 + per kg of soil and was positively correlated with the altitude of a plot. Eriochrome cyanine staining was used to evaluate the effect of Al ions on the root elongation. Seventy-two hour exposure of 3-day-old seedlings to 100 and 200 mM Al in nutrient solution revealed a high number of Al resistant genotypes among wheat germplasm. After withdrawal of Al stress, survival and root regrowth was observed in 28 and 23 genotypes screened at 100 and 200 mM Al in nutrient solution, respectively. Enhanced resistance to Al among Madeiran genotypes was associated with the amount of ionic Al in the soils. Complexity and various patterns of responses of tested cultivars to Al stress may suggest that Madeiran germplasm could be a valuable source of genes controlling Al resistance for conventional breeding programs and for studies of molecular bases of mechanisms of Al resistance.