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Bisko A.,Institute of Pomology | Savic Z.,Paying Agency for Agriculture | Vrduka D.,Croatian Chamber of Commerce | Jukic L.,Institute for Seed and Seedlings
Acta Horticulturae | Year: 2015

Pear (Pyrus communis L.) is a popular fruit species in Croatia. It is grown mainly on small family farms and less on large plantations. By growing areas, compared to other fruit species, pear is in 9th place, with a share of 3.31% (860 ha out of 26,003 ha). Since the production is less than 10,000 t per year significant quantities of fruit for consumption and processing have to be imported. Based on 15- year data the most common rootstock is Pyrus communis L. (39.1%), followed by Quince BA 29 (25.4%), MC (17.8%), MA (16.4%), Sydo (0.7%) and Adams (0.5%). The most common cultivars is 'Williams' (27.3%), followed by 'Conference' (16%), 'Bella di Giugno' (8.5%), 'Abbe Fetel' (7.1%), 'Butira Precoce Morettini' (5.5%), 'Santa Maria' (5.1%), 'Poire de Cure' (4.9%), 'Beurre Hardy' (3.5%), 'Packam's Triumph' (2.2%) and 'Clapp's Favourite' (1.9%). The average number of trees per ha is 1,267. Of the total number of registered trees only 9% are grown in the Adriatic Croatia, and the remaining 91% (781.8 ha) in the continental part of Croatia. In the past decade modern plantations have been gradually established on less vigorous rootstocks (mainly MC and less Adams and Sydo) with economically valuable cultivars such as 'Abbe Fetel' and 'Conference'.

Hanzer R.,Institute for Seed and Seedlings | Ocvirk D.,Institute for Seed and Seedlings | Spoljaric Markovic S.,Institute for Seed and Seedlings | Fulgosi H.,Ruder Boskovic Institute
Agriculturae Conspectus Scientificus | Year: 2012

Croatia has a long tradition in seed production for domestic use and for export. As an EU candidate country Croatia has harmonized its legislation with EU directives and therefore no GM soybean is authorized for cultivation. So far there is no record of introduction of GM soybean into Croatian environment; however there are earlier records of growing genetically modified soybean in the region. Aim of this study is to monitor current position in domestic seed market regarding genetically modified soybeans through substantial PCR screening for three lines: GTS 40-3-2 (Roundup Ready, RRS), A2704-12 (Liberty Link, LL) and MON89788 soybean (RR2). Screening was performed on high category soybean seed that was certified for Croatian market in season 2010/2011. Total of 18 diff erent varieties of soybean seed were tested and all resulted negative for the presence of the tested GM lines. Th is is the first such screening of Croatian seed market.

Ocvirk D.,Institute for Seed and Seedlings | Hanzer R.,Institute for Seed and Seedlings | Spoljaric Markovic S.,Institute for Seed and Seedlings | Teklic T.,Josip Juraj Strossmayer University of Osijek
Agriculturae Conspectus Scientificus | Year: 2012

After purchasing seed it often happens that all the seed is not used during one season, but they are stored for a couple of years. The aim of this study was to examine whether germination of radicchio and endive is still high enough after longer storage. We also wanted to define seed vigor in relation to the year of production and variety, and whether pretreatment with KNO3 could improve germination of older seed of radicchio and endive. The seed of three varieties of radicchio ('Pallarossa', 'Verona' and 'Pandizucchero') and three varieties of endive ('Dječja glava', 'Pankalierka' and 'Escariol žuta'), from five seasons of certification (06/07, 07/08 08/09, 09/10 and 10/11) was tested. The following seed traits were analyzed: 1000 seed weight, moisture, germination rate, standard germination test, seed electrical conductivity, and the amount of absorbed water per gram of seed for 24 hours. Seed was germinated in two soaking treatments: in tap water wiThcooling pre-treatment, and KNO3. Based on the results, it was concluded that treatment with KNO3 significantly increases the standard germination of radicchio, as compared wiThwater, and does not improve the germination of endive seed, but on the contrary, it has a negative effect. In boThplant species, conductivity does not increase wiThseed age, because the oldest seed did not show the highest EC. In order to fully assess the impact of aging on seed vigor in tested plant species it is necessary to conduct further research.

Ocvirk D.,Institute for Seed and Seedlings | Spoljarevic M.,Josip Juraj Strossmayer University of Osijek | Markovic S.S.,Institute for Seed and Seedlings | Lisjak M.,Josip Juraj Strossmayer University of Osijek | And 2 more authors.
Journal of Food, Agriculture and Environment | Year: 2014

The aim of this research was to investigate the influence of an imbibition during bulk seed conductivity test on maize seed germinability and to establish the relations among maize (Zea mays L.) seed conductivity and other vigour parameters in different germination conditions. Large and medium seed size of ten maize hybrids harvested in two subsequent years were tested by standard germination test (SG), cold test (CT) and electrical conductivity test (EC), as well as by germination test after EC evaluation. The effects of seed size, seed age, hybrid and their interactions were strongly expressed in the majority of analyzed seed and seedling vigour parameters. Mean seed germinability evaluated after EC test was 91.7%, which was slightly lower than mean SG value (%), implying no significant imbibitional damage especially in hybrids with high seed vigour. EC value under 10 μS cm-1 g-1 was obtained with seed showing high germination and seedling vigour for both SG and CT. EC values higher than 12 μS cm-1 g-1 were recorded with seed samples showing low germinability after EC test, which germinated less than 50% in CT conditions as well. EC test value showed strong negative correlations with the most of the maize seed and seedling vigour parameters in the applied germination tests, such as germinability, germination rate, root and coleoptile length and seedling mass. The presented results may help in the standardization of this very applicable test for maize seed, and its adoption as a routine vigour test in maize seed production and quality control is suggested.

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