1,721,019 research outputs found
La vegetazione infestante del mais nella Pianura padano-veneta. Risultati di un'indagine. Nota 1: aspetti qualitativi.
No full textLa vegetazione infestante del mais (Zea Mays L.) nella pianura padano-veneta. Nota II: aspetti fitosociologici e organizzazione strutturale.
No full textA PROFILE OF THE POTENTIAL FLORA IN MAIZE FIELDS OF THE PO VALLEY
No full textQualitative and quantitative surveys (biological and ecophysiological spectrum, structural organization, seed bank size) of the potential flora (PF) in maize (Zea mays L.) fields of the Po Valley are reported. Data were collected from 45 sites and two sampling depths (0–20 cm and 21–40 cm). Soil seed content was highly variable, ranging from 1660 to 53371 seeds m−2, with an average value of 10391 seeds m−2 and a median of 5500 seeds m−2. Seed stock was lower than 2000 seeds m−2 in 6.6% of the sites and over 10000 in 26.6%. Six species were found in more than 50% of the sites, representing 27.7% of the total stock: Anagallis arvensis L., Chenopodium album L., Stellaria media (L.) Vill., Echinochloa crus‐galli (L.) P. Beauv., Amaranthus spp., Polygonum persicaria L. + P. lapathifolium > L. Overall, 63 species were recorded, the species number per site ranging from 4 to 25, with a median value of 11. Therophytes accounted for 90.6% of the species and 94.3% of individuals. Of the species, ..
Classification of Italian Xanthium strumarium complex based on biological traits, electrophoretic analysis and response to maize interference
No full textXanthium strumarium complex was studied taking plant seeds from 16 diverse locations in Italy. Plant morphophysiological traits were noted and electrophoretical analysis of seed reserve proteins was carried out from individual plants grown at the same site, in the presence and absence of competition from maize. Significant correlations between diverse plant phenological traits, the geographical origin of the seeds and the seed protein electrophoretic patterns were found. A high correlation between seed reserve proteins and the genetic structure of this weed was also detected. Maize competition increased Xanthium stem growth and decreased bur production and number of branches. Xanthium plant populations could be classified according to the morphological characters evaluated in three groups closely related to their geographical original area and latitude (northern, central and southern Italy), each showing precise morphological traits of Xanthium italicum, X. strumarium and X. orientale respectively. Electrophoresis supported the classification of these three morphological groups
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