Induced androgenesis in tomato (Lycopersicon esculentum Mill.). III. Characterization of the regenerants

We present data on the morphological, cytological, biochemical and genetic characteristics of tomato regenerants obtained through anther culture. As a result of induced androgenesis, more than 6,000 rooted regenerants were developed that differed both from the donor plants and among each other with...

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Bibliographic Details
Published in:Plant cell reports 2004-02, Vol.22 (7), p.449-456
Main Authors: Zagorska, N A, Shtereva, L A, Kruleva, M M, Sotirova, V G, Baralieva, D L, Dimitrov, B D
Format: Article
Language:English
Subjects:
Actinomycetales - pathogenicity
Breeding
Clavibacter michiganense michiganense
Genes, Plant
Hybridization, Genetic
Lycopersicon esculentum
Lycopersicon esculentum - genetics
Lycopersicon esculentum - growth & development
Lycopersicon esculentum - microbiology
Lycopersicon esculentum - physiology
Mutation
Ploidies
Regeneration
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Summary:We present data on the morphological, cytological, biochemical and genetic characteristics of tomato regenerants obtained through anther culture. As a result of induced androgenesis, more than 6,000 rooted regenerants were developed that differed both from the donor plants and among each other with respect to habitus and leaf, flower and inflorescence morphology. Cytological analysis revealed a great variability in chromosome number in the cells of the regenerated plants. While most of the regenerants were mixoploid, the majority of the cells had a haploid chromosome number. R(1) and R(2) progenies were tested for their resistance to Clavibacter michiganense subsp. michiganense ( Cmm 7). Some of the regenerants were resistant to the pathogen. A biochemical analysis of fruit from R(3) and R(4) plants showed a higher content of dry matter, sugars and vitamin C in the regenerant plants obtained from the hybrids than in those from the cultivars and control plants. The values of the parameters of hybrid regenerants grown in the greenhouse were about 1.5-fold higher than those of the hybrid regenerants grown in the field, and this trend is clearly expressed in all of the hybrid regenerants. The results obtained suggest that induced androgenesis and gametoclonal variation may be used as an additional tool to create a large range of new forms. The application of the latter in breeding programs would accelerate the development of tomato lines and varieties that would be more productive, disease-resistant, highly nutritive and flavour-acceptable.
ISSN:0721-7714
1432-203X
DOI:10.1007/s00299-003-0720-8