Directorate General of Agricultural Research

Thérmi, Greece

Directorate General of Agricultural Research

Thérmi, Greece

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Koutsika-Sotiriou M.,Aristotle University of Thessaloniki | Mylonas I.,Aristotle University of Thessaloniki | Tsivelikas A.,Directorate General of Agricultural Research | Tsivelikas A.,International Center for Agricultural Research in the Dry Areas | Traka-Mavrona E.,Directorate General of Agricultural Research
Scientia Horticulturae | Year: 2016

The attributes of yield and yield stability of two coexisting lines within the old landrace of small-sized tomatoes 'Tomataki Santorinis', i.e., 'Genuine Santorinis' ('G'-line) and 'Traditional Santorinis' ('T'-line) were defined, quantifying the interaction of the lines with the environment. The experiments were conducted in parallel at two environments: (a) two-year intra-selection experiments in situ (island of Santorini) under traditional agronomic management, (b) two-year evaluation experiments ex situ (Agricultural Research Center of Northern Greece) under the usual 'farmer's technique', and (c) final comparative trials of selected entries of each line with the source material in situ and ex situ. Especially, for the attributes of yield, the number and the weight of early and total fruits were measured. Additionally, descriptive (fruit ribbing and shape) and qualitative (total soluble solids, total solids and pH) characteristics were recorded. In the in situ environment, genetic variance for yield components was medium to high for 'G'-line and zero to low for 'T'-line. In the ex situ environment. , the genetic variance was high for 'G'-line and low for 'T'-line. Ranking of yield components, between the two environments, showed significant correlations of 'G'-line and 'T'-line in situ. Ex situ, the 'T'-line performed similarly, while the 'G'-line showed reduced association between phenotypic and genotypic performance. The comparative trials showed significant difference between selected entries and source material solely for the 'G'-line, revealing different compensation profiles of the lines' adaptive ability. The 'G'-line profile revealed productivity, efficiency to direct selection and specific adaptability. The 'T'-line profile revealed lower productivity, high homogeneity and broad adaptation. These profiles permit breeders to develop two distinctive types of the landrace, either as a Protected Designation of Origin (PDO) cultivar or as a line. © 2015 Elsevier B.V.


Koutsika-Sotiriou M.,Aristotle University of Thessaloniki | Anthimidou E.,Aristotle University of Thessaloniki | Menexes G.,Aristotle University of Thessaloniki | Traka-Mavrona E.,Directorate General of Agricultural Research
Romanian Biotechnological Letters | Year: 2016

This study concerns three successive research projects aiming at a common final outcome: a) the divergent selection in the winter melon old cultivar 'Thrakiotiko' (Cucumis melo L., group Inodorus, casaba type) for resistant genotypes to Fusarium wilt, which resulted in the development of two resistant populations to Fusarium oxysporum f.sp. melonis: 'Thrakiotiko-1' and 'Thrakiotiko-2', b) the breeding manipulations of the old cultivar to achieve uniformity and stability in yield and quality in a new cultivar, which was registered in the national and European catalogues of vegetable species as 'Thrakiotiko', and c) the performance of the new melon cultivar as scion tested on four rootstocks: 'Thrakiotiko-1' and 'Thrakiotiko-2', 'Manta' (C. melo, group cantalupensis) and 'TZ-148' (interspecific Cucurbita spp. hybrid). Using the improved cultivar 'Thrakiotiko' and the galia type hybrid 'Masada' as scions, on the rootstock 'Thrakiotiko-1' significantly increased yield by 36% compared to the ungrafted control, whereas the performance of the same rootstock used for 'Masada' was similar to that of the other melon rootstocks and the control. In addition, 'Thrakiotiko-1' improved fruit quality in both grafted cultivars. 'Thrakiotiko-2' performed similarly to the commercial rootstocks, without differing significantly from the control. © 2016 University of Bucharest.

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