Analysis of Re-Heterosis for Yield and Fruit Quality in Restructured Hybrids, Generated from Crossings among Tomato Recombinant Lines
Ilias D. Avdikos,
Georgia-Maria Nteve,
Athanasia Apostolopoulou,
Rafail Tagiakas,
Ioannis Mylonas,
Ioannis N. Xynias,
Fokion Papathanasiou,
Panagiotis Kalaitzis,
Athanasios G. Mavromatis
Affiliations
Ilias D. Avdikos
Laboratory Genetics and Plant Breeding, School of Agriculture, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Georgia-Maria Nteve
Laboratory Genetics and Plant Breeding, School of Agriculture, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Athanasia Apostolopoulou
Laboratory Genetics and Plant Breeding, School of Agriculture, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Rafail Tagiakas
Laboratory Genetics and Plant Breeding, School of Agriculture, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Ioannis Mylonas
Institute of Plant Breeding and Genetic Resources, Hellenic Agricultural Organization—“Demeter”, 57001 Thessaloniki, Greece
Ioannis N. Xynias
School of Agricultural Sciences, University of Western Macedonia, Terma Kontopoulou, 53100 Florina, Greece
Fokion Papathanasiou
School of Agricultural Sciences, University of Western Macedonia, Terma Kontopoulou, 53100 Florina, Greece
Panagiotis Kalaitzis
Department of Horticultural Genetics and Biotechnology, Mediterranean Agronomic Institute of Chania (MAICh), Alsyllio Agrokepiou, Chania, 73100 Crete, Greece
Athanasios G. Mavromatis
Laboratory Genetics and Plant Breeding, School of Agriculture, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Randomized complete block design was used, with three replications. Heterosis for yield and fruit quality characteristics was studied, and expressed as Relative heterosis, heterobeltiosis and Standard heterosis. It would be expected, according to the dominance model, that the heterosis recorded after crossing the recombinant lines, having only a small portion of recessive deleterious alleles, would be minimal. The results showed that the elite recombinant inbred lines became the parents of elite restructured hybrids, with increased levels of re-heterosis for all characters measured. This may prove that dominance is not the only case in explaining heterosis in tomato for yield components and fruit quality characteristics. Several recombinant lines, and most of the new reconstructed F1 hybrids, showed excellent productivity under a low input farming system. The evaluation and selection of the different types of cultivars (recombinant pure lines or reconstructed hybrids) under low input conditions could point towards the most suitable/ideal genotype for organic cultivation.
