Mostrando recursos 1 - 20 de 29

  1. Effect of storage time at low temperature on the volatile compound composition of Sevillana and Maravilla raspberries

    Morales, M. L.; Callejon, R. M.; Ubeda, C.; Guerreiro, A.; Gago, C.; Miguel, Maria Graça; Antunes, Maria Dulce
    In this study, the effect of storage time at low temperature on volatile compounds in two cultivars of raspberry, Rubus idaeus L. cv. Sevillana and Maravilla, was determined. A total of 28 compounds were identified in both cultivars and showed quantitative differences between the cultivars. The Sevillana cultivar was richer in volatile compounds than the Maravilla cultivar. beta-Ionone had the highest concentration in both cultivars. We observed opposing trends in the volatile compound composition for the cultivars during storage at low temperature, in which 'Sevillana' lost compounds and 'Maravilla' was enriched. Therefore, storage at low temperature causes important changes in...

  2. Mapping orchard fruit quality characteristics of apricot (Prunus armeniaca L.) cultivars 'Beliana' and 'Lindo'

    Panagopoulos, Thomas; Baltasar, O.; Antunes, Maria Dulce
    The market has become increasingly more demanding about information on product origin, production inputs, environment impacts and quality. Frequently, information required by the post-harvest and marketing components must be sourced from the producer. Also, the information sought from the producer needs to be based on complex data collected under a wide range of field conditions. The objective of this work was to use tools such as geographic information systems and geostatistics to generate information that can be used to optimise physical and financial aspects of apricot production systems. Apricot fruits from geo-referenced groups of trees were analysed at harvest for...

  3. 'Rocha' pear firmness predicted by a Vis/NIR segmented model

    Cavaco, A. M.; Pinto, P.; Antunes, Maria Dulce; da Silva, J. M.; Guerra, Rui
    We present a segmented partial least squares (PLS) prediction model for firmness of 'Rocha' pear (Pyres communis L) during fruit ripening under shelf-life conditions. Pears were collected from three different orchards. Orchard I provided the pears for model calibration and internal validation (set 1). These were transferred to shelf-life in the dark at 20 +/- 2 degrees C and 70% RH, immediately after harvest. External validation was performed on the pears from the other two orchards (sets 2 and 3), which were stored under different conditions before shelf-life. Fruit was followed in the shelf-life period by visible/near infrared reflectance spectroscopy...

  4. Chilling induced ethylene biosynthesis in 'Hayward' kiwifruit following storage

    Antunes, Maria Dulce; Sfakiotakis, E. M.
    'Hayward' kiwifruit were stored at 0, 5, 10, 15 and 20degreesC for 5, 12 and 17 days before rewarming to 20degreesC for 10 more days. Ethylene and CO(2) production, ACC, ACC synthase (ACS) and ACC oxidase (ACO) activities, flesh and core firmness, soluble solids content (SSC) and fleshy colour were measured. Kiwifruit stored at 0, 5, 10 and 15degreesC did riot ripen, produce ethylene or show increases in ACS or ACO activity. Fruit stored for 5 days at the above temperatures, then rewarmed to 20degreesC, did not show any change during the following 10 days. Rewarmed fruit, pre-stored at 0-10degreesC...

  5. Ethylene biosynthesis and ripening behaviour of 'Hayward' kiwifruit subjected to some controlled atmospheres

    Antunes, Maria Dulce; Sfakiotakis, E. M.
    The effects of storage in air (AS), controlled atmosphere (CA) or ultra low oxygen (ULO) on ethylene biosynthesis and ripening of 'Hayward' kiwifruit during storage at 0 degreesC and post-storage at 20 degreesC, were investigated. Fruit were stored for 60, 120 and 180 days at 0 degreesC in AS, CA (2%O(2) + 5%CO(2)) and ULO (0.7%O(2) + 0.7%CO(2) and 1%O(2) + 1%CO(2)). Freshly harvested fruit and fruit removed from storage were treated with 130 mul/l propylene or propylene-free air for 9 days at 20 degreesC. Fruit treated with propylene at 20 degreesC at harvest produced ethylene with a tag period...

  6. The effect of pre- and postharvest calcium applications on 'Hayward' kiwifruit storage ability

    Antunes, Maria Dulce; Panagopoulos, T; Rodrigues, S; Neves, N; Curado, F
    The benefits of calcium applications pre and postharvest on fruit storage ability have been mentioned in the bibliography. It was objective of this work to study the effect of calcium preharvest application in two different forms and calcium chloride application postharvest on 'Hayward' kiwifruit storage ability. Kiwifruit vines were sprayed with 0.03% CaCl2 or 0.03% CaO at one, three and four months before harvest. The control did not have any treatment. After harvest, half fruits were dipped for 2 min in a solution of 1% CaCl2, left to dry and stored at 0°C. The other half was stored at the...

  7. Analysis of spatial interpolation for optimising management of a salinized field cultivated with lettuce

    Panagopoulos, Thomas; Jesus, J.; Antunes, Maria Dulce; Beltrão, J.
    The lack of randomisation in irrigation experiments is usually a disadvantage. The introduction of spatial variable experimental design offers a convenient tool to help solving this problem. In order to understand the variation of some soil physical and chemical properties in an experimental block and its effect on lettuce (Lactuca sauna L.) production, graphical interpretation of those soil properties was done with the use of geostatistics in a geographic information system (GIS). In this work three techniques of geostatistics were used for the creation of several maps of soil properties in an experimental plot cultivated with lettuce. Lettuces were evaluated...

  8. Using Supply Chain Information for Kiwi (Actinidia deliciosa) cv. 'Hayward' Fruit Quality and Production Optimization

    Panagopoulos, T; Jesus, J; Antunes, Maria Dulce
    The market is increasingly exigent about information on product origin, production inputs, environment impacts and quality. Frequently, information required by postharvest and marketing components must be sourced from the producer. In addition, the information sought from the producer needs to be based on complex data collected under a wide range of field conditions. The objective of this work was to use tools such as, geographic information systems and geostatistics to generate information that could be used to optimise physical and financial aspects of kiwifiruit production systems. Kiwifruits from georeterenced groups of trees were analysed at harvest for yield, soluble solids...

  9. A Preliminary Approach to the Prediction of 'Rocha' Pear Skin Pigments by Vis/NIR Reflectance Spectroscopy

    Cavaco, Ana M.; Antunes, Maria Dulce; da Silva, J. M.; Guerra, R.
    'Rocha' pear (Pyrus communis L.) is an exclusively Portuguese certified pear cultivar commercialized worldwide. Mature unripe 'Rocha' pears were obtained from COOPVAL (Cadaval, Portugal) after 8 months at -0.5 degrees C, 94-96% RH and CA (2% O-2+0.5% CO2). Then, they were maintained in a dark room at 20+/-2 degrees C and 70% RH to simulate shelf life. For three weeks these fruit were followed along using Vis/NIR reflectance spectroscopy in the wavelength range of 400 to 950 nm, and their colour and firmness were evaluated by standard techniques. 'Rocha' pear firmness decreased significantly during shelf life, paralleled by the yellowing...

  10. The effect of hydrogen cyanamide on bud break and yield of kiwifruit in Northwest-Portugal

    Veloso, A.; Oliveira, M.; Antunes, Maria Dulce
    Kiwifruit (Actinidia deliciosa cv. Hayward) was introduced into Northwest Portugal at the early 1970's increasing its importance up to date. The main objective of orchard management is to find out the cultural techniques suitable for the region, in order to obtain good yield and quality fruit. Winter chilling (less than or equal to7.2degreesC) plays a significant role in kiwifruit break dormancy. Insufficient chilling can be countered by chemical agents as hydrogen cyanamid (Dormex). The objective of this research was to quantify the efficiency of hydrogen cyanamide (0%, 4%, and 6%) on bud break dormancy and yield and fruit quality. Experiments...

  11. The effect of calcium applications on kiwifruit quality preservation during storage

    Antunes, Maria Dulce; Neves, N.; Curado, F.; Rodrigues, S.; Franco, J.; Panagopoulos, Thomas
    It is well known that calcium increases storage life of many fruits. This study investigated the effect of vine calcium application, as well as postharvest application on storage behaviour of 'Hayward' kiwifruit. Three applications of 0.03% CaCl2 or CaO were made in June, July and September. After harvest half of the fruit from sprayed vines were dipped in a solution of 2% CaCl2; the other fruit were untreated. All fruit were then stored at 0 degrees C and relative humidity of about 90-95%. Results for fruit of the size range 85-105 g are discussed. Kiwifruit dipped in 2% CaCl2 postharvest...

  12. The effect of low temperature and controlled atmosphere storage on autocatalytic ethylene production and ripening of kiwifruit cv.'Hayward'

    Antunes, Maria Dulce; Sfakiotakis, EM

  13. Decision support tools for optimising kiwifruit production and quality

    Panagopoulos, Thomas; Rodrigues, S.; Neves, N.; Cruz, S.; Antunes, Maria Dulce
    The importance of kiwifruit (Actinidia deliciosa 'Hayward') production has increased greatly during the last decade in the Portuguese region of Beira Litoral. However, information on the nutritional status of this crop in this soil/climatic zone is scarce. The objective of this work was to use techniques such as geographic information systems (GIS) and geostatistics to generate information that can be used to optimise physical and financial aspects of kiwifruit production systems. A regional survey was conducted over three years (2002-2004) in 15 geo-referenced orchards of Beira Litoral. Soil analysis and fruit production and quality were determined. In order to understand...

  14. The use of essential oils for postharvest decay control. A review

    Antunes, Maria Dulce; Cavaco, A. M.
    Food safety is one of the major issues related to fresh fruit and vegetables. The preservation of the 'freshness' quality of these products is relevant due to their economical impact. This chapter is a comprehensive review of the use of essential oils from different sources and their constituents on the control of postharvest decay and overall quality preservation of fresh fruit and vegetables. An overview on the most significant postharvest diseases and their impact, as well as on the mainly used synthetic chemicals and their side-effects has been included. Emphasis has been on the sources of essential oils and their...

  15. Refrigeration needs for sustainable preservation of horticultural products

    Gago, C. M. L.; Sousa, A. R.; Julião, M.; Miguel, G.; Antunes, Maria Dulce; Panagopoulos, Thomas
    Fresh horticultural products are highly perishable and need refrigeration for further preservation. Refrigeration needs energy consumption with consequent economical cost and damage for the environment. The objective of the present work was to use efficiently the refrigeration according to the product needs and time for consumption. Salicornia ramosissima and Sarcocornia perennis fresh branch tips, which are used for fresh salads, were stored at 1, 4 and 9 °C for up to 21 days. In both species, fresh tips were of good consumer acceptability for up to 14 days at 9°C. At 1 and 4 °C fresh tips could be stored...

  16. Evaluation of the effect of complementary pollination on Actinidia deliciosa 'Hayward' in northwest Portugal

    Antunes, Maria Dulce; Oliveira, M.; Teixeira, M.; Velos, A.; Veloso, F.; Panagopoulos, Thomas
    The objective of this research was to study the effect of complementary pollination on kiwifruit production and quality. For 3 years, complementary application of wet or dry pollen have been done at different stages of flower opening on vines in the Portuguese regions of Entre-Douro e Minho and Beira Litoral. Commercial production data were collected and fruit quality attributes were measured at harvest. Complementary pollination did not affect fruit soluble solids content or firmness in any year, and was beneficial for fruit size and commercial production in the third year only, showing that it is important in some conditions, when...

  17. Taste panel quality evaluation of 'Hayward' kiwifruit of different origins

    Franco, J.; Melo, F.; Guilherme, R.; Neves, N.; Curado, F.; Antunes, Maria Dulce
    In Portugal, the regions of Entre-Douro e Minho and Beira Litoral have exceptional conditions for the production of good quality kiwifruit. However, demand exceeds local supply resulting in importation of kiwifruit from Italy, Chile and New Zealand. Taste panels were run in December, May and June to study the preferences of Portuguese consumers for 'Hayward' kiwifruit. In December, a comparison was made between kiwifruit from Portugal and Italy, in May between kiwifruit from Portugal and Chile and in June between kiwifruit from Portugal, Chile and New Zealand. Attributes assessed by panellists were: appearance, texture, flavour, sweetness and acidity. The same...

  18. The effect of pre- and postharvest calcium applications on 'Hayward' kiwifruit storage ability

    Antunes, Maria Dulce; Panagopoulos, Thomas; Neves, N.; Curado, F.; Rodrigues, S.
    The benefits of calcium applications pre and postharvest on fruit storage ability have been mentioned in the bibliography. It was objective of this work to study the effect of calcium preharvest application in two different forms and calcium chloride application postharvest on 'Hayward' kiwifruit storage ability. Kiwifruit vines were sprayed with 0.03% CaCl2 or 0.03% CaO at one, three and four months before harvest. The control did not have any treatment. After harvest, half fruits were dipped for 2 min in a solution of 1% CaCl2, left to dry and stored at 0 degrees C. The other half was stored...

  19. The role of ethylene in kiwifruit ripening and senescence

    Antunes, Maria Dulce
    Purpose of review: Kiwifruit cv. 'Hayward' is considered a fruit with typical climacteric behaviour. Healthy fruit display climacteric behaviour at ambient temperature (∼20°C) and non-climacteric behaviour at temperatures ≤10°C. However, it is extremely sensitive to ethylene action even at low temperatures. The behaviour of kiwifruit in relation to ethylene sensitivity and ethylene production is of great importance for long-term storage. This paper discusses the most recent findings concerning the role of ethylene in kiwifruit ripening and senescence. Main findings: Kiwifruit senses propylene at temperatures ranging from 15 to 34°C by advancing the onset of ripening and respiration, while the ethylene...

  20. Spatial Distribution of Qualitative Characteristics and Production Factors of Kiwifruit at "Beira Litoral", Portugal

    Panagopoulos, Thomas; Antunes, Maria Dulce
    Objective of the present research was to generate information about the evolution of production factors and qualitative characteristics of 100 geo-referenced orchards of Beira Litoral-Portugal during three consecutive years. Graphical interpretation of quantitative and qualitative characteristics of kiwifruit production was done using GIS, geostatistics. Maps of biophysical characteristics of the region were then related to the areas of higher production and quality and it was studied their evolution over time. Those maps help to make decisions about harvesting time or localized correction of production factors and to choose the adequate location for vineyard installation in the region. Despite our enthusiasm...

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