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Seaweed extracts are widely used in agriculture as ecological focus substances applied to improve crop growth and quality. One of the primary benefits they bring is increased effectiveness of fruit setting as well as improved stress tolerance, essential for warm-climate crops cultivated in the nonoptimal environmental conditions of Northern and Central Europe. The aim of this study was a preliminary investigation of any genotype-dependent reaction of eggplant cultivars (Solanum melongena) to application of a standardized extract of the seaweed Ascophyllum nodosum (Göemar BM-86) under field conditions in Poland. The only statistically relevant result of this biostimulant was shown for cultivar ‘Flavine’ F1, where it positively affected the early crop yield and the number of fruits per plant. Fruit quality attributes, including antioxidant activity, as well as selected mineral contents, increased as an effect of biostimulant spraying. This reaction was specific for the cultivars investigated, and it was confirmed by significant differences in the main effects between biostimulant and control treatments for almost all the properties measured. The use of this A. nodosum extract suggested that there could be an improvement in fruit yield and quality in selected eggplant cultivars under field conditions in the temperate climatic zone.
Seaweeds are one of the important marine bioresources which are nowadays termed as eco-friendly stimulators of crop growth, stress tolerance, and yielding. In this review, we give an update of the current state of our understanding of the seaweed extracts (SWE) effects on the physiological alterations they induce in Solanaceae vegetables. SWE may provide a powerful and environmentally friendly approach to nutrient management. A pool of common bioactive molecules of SWE provides enhancement of the antioxidant machinery of treated plants providing balanced development, earlier flowering, and enhanced fruiting. The basic mechanisms of SWE action seem to be unspecific for tomato, pepper, and eggplant. They include accelerating growth, nutrient uptake, and photosynthesis performance, which can induce plant tolerance to adverse environmental conditions, improve flowering, fruit setting, and yield, and enhance nutritional quality of the crops. The mechanism of SWE action is complex because of multielement composition and cross-action between constituents.
Sweet pepper cultivars of Polish breeding have a high biological potential predisposing them to cultivation in field conditions of moderate climatic zone. The aim of investigations was the description of the dependence between morphological features of pepper fruits and its nutritional value. The experiment was performed in 2008, 2009 and 2011 at the University of Agriculture in Krakow, Poland, on eleven Capsicum annuum L. cultivars of Polish origin (‘Barbórka’, ‘Calipso’, ‘Caryca’ F1, ‘Etiuda’, ‘Gloria’, ‘Iga’, ‘Lena’, ‘Mercedes’, ‘Mira’, ‘Oliwia’, ‘Ożarowska’). Fruits shape was diversified, from spherical (‘Iga’) to the slim conical (‘Mercedes’, ‘Mira’). The fruits of greatest weight was typical for ‘Barbórka’, ‘Caryca’ F1, ‘Etiuda’, ‘Gloria’ and ‘Ożarowska’. Thick pericarp and high share of pericarp in weight of fruit were characteristic for all investigated genotypes, and differences with regard to this parameters were slight. ‘Barbórka’, ‘Gloria’, and ‘Ożarowska’ contained higher than average dry weight, soluble sugars and carotenoids contents for all tested cultivars. The relationships between fruit morphology parameters and chosen chemical parameters was shown on a base of regression analyses. Present results made possible to select the most valuable sweet pepper cultivars with respect to nutritional value and fruit morphology. This study also enables to select genotypes, destined for field cultivation in Polish climatic conditions, for different ways of utilization. The results can also be used in future breeding programs.
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