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2 Acta Scientiarum Polonorum. Hortorum Cultus

2 2017

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Influence of container volume and irrigation system on photosynthesis, water productivity and growth of potted Euphorbia × lomi

100%

Fascella G. , Rouphael Y.

Acta Scientiarum Polonorum. Hortorum Cultus

2017

tom 16

nr 3

The determination of an adequate container volume that maximize vegetative growth and the adoption of an efficient irrigation system in soilless culture, which improve water use efficiency without affecting crop performance, have become a priority in ornamental industry. A greenhouse experiment was conducted aiming to assess the effects of two container volumes (1 dm3 or 3 dm3) and two irrigation systems (closed dripirrigation or subirrigation) on growth parameters, ornamental quality, SPAD index, leaf gas exchange, agronomical and physiological water use efficiency (WUEA and WUEP) of containerized Euphorbia × lomi Rauh. There were no significant differences in terms of plant growth parameters between the two irrigation systems. The subirrigation system was more efficient in terms of water use than the drip-irrigation system since it could save on average 27% of water. The WUEA recorded with subirrigation in 3 dm3 and 1 dm3 containers were significantly higher by 43% and 81% compared with those recorded with drip-irrigation. The plant height, leaf number, leaf area, root length and shoot dry biomass were significantly lower by 45.7%, 39.5%, 45.5%, 35.1% and 43.1%, respectively when the Euphorbia × lomi plants were cultivated in the 1 dm3 containers. The best crop performance recorded in the 3 dm3 containers was related to a higher photosynthetic activity and higher leaf chlorophyll content (i.e. SPAD index) with respect to the plants grown in the 1 dm3 containers.

Genotypic variation in nutritional and antioxidant profile among iceberg lettuce cultivars

61%

Rouphael Y. , Kyriacou M. C. , Vitaglione P. , Giordano M. , Pannico A. , Colantuono A. , De Pascale S.

Acta Scientiarum Polonorum. Hortorum Cultus

2017

tom 16

nr 3

Regular consumption of fruits and vegetables is associated with reduced risk of chronic diseases and improvement of cognitive health. Lettuce (Lactuca sativa L.) is a major salad food, which is widely grown and consumed worldwide. Cultivars-specific information on bioactive composition of crisphead subtype iceberg remains scarce. The present study aimed to profile the nutrition and antioxidant composition of seven new cultivars of iceberg (‘Equinos’, ‘Ice Castle’, ‘Metalia’, ‘Num 189’, ‘Silvinas’, ‘Ombrinas’ and ‘Vanguardia’). The head fresh mass of the iceberg cultivars ranged from 485 to 801 g per plant, with the highest values recorded in ‘Num 189’ and ‘Vanguardia’. Across cultivars, K was the predominant macronutrient and was followed by Ca. The highest nitrate content was recorded in ‘Equinos’ and ‘Umbrinas’, whereas the lowest value was observed in ‘Metalia’. The hydrophilic (HAA) and lipophylic antioxidant activities (LAA) of the selected iceberg cultivars ranged from 4.9 to 13.0 mmol ascorbic acid 100 g-1 dw, and from 6.8 to 12.5 mmol Trolox 100 g-1 dw, respectively. Chicoric acid was the main phenolic acid present in all cultivars, followed by chlorogenic acid and caffeoyl tartaric acid. The highest HAA, LAA, caffeoyl tartaric acid, chicoric acid and total phenolic content were observed in ‘Num 189’, whereas an opposite trend was recorded for chlorogenic acid. The current findings will improve knowledge of the compositional variation among iceberg cultivars and assist growers in selecting cultivars combining optimal yield with high nutritional value.