Trisomics from triploid-diploid crosses in self-incompatible Lycopersicum peruvianum |
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Authors: | Sree Ramulu K Devreux M Carluccio F de Nettancourt D |
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Institution: | (1) Laboratorio Valorizzazione Colture Industriali del CNEN, C.S.N. Casaccia, Roma, Italy;(2) Laboratory of Plant Genetics, Agronomy Faculty, Université Catholique de Louvain, Louvain-la-Neuve, Belgium;(3) EURATOM-ITAL, P.O. Box 48, Wageningen, the Netherlands;(4) European Communities Biology group, D.G. XII C.C.R, 21020 Ispra, Italy;(5) European Communities, D.G. XII Rue de la Loi, 200 1040 Brussels, Belgium |
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Abstract: | Summary The transmission rate of trisomy was determined for two primary trisomic types, triplo-1 and triplo-3, of the self-incompatible species Lycopersicum peruvianum. Chromosome counts in somatic metaphases of root-tip squashes from 112 progeny plants showed that 8 individuals (7.2 %) were trisomic and 104 (92.8%) were diploid. The average frequency of transmission approximated 2.6% in triplo-1 and 8.6% in triplo-3. Data are presented on the karyotype and the morphological features of the 8 trisomics detected in the progenies of triplo-1 and triplo-3 and the various factors affecting the transmission rate of trisomy are discussed.The transmission rate of trisomy was also determined for the trisomic plant 269 which displayed a complete deletion of the satellited part of chromosome 2 and was characterized by ovate fruits. Out of 18 progeny plants analysed, 8 (44.4%) were trisomic and 10 (55.6%) were diploid. Cytological and morphological analyses of the 8 trisomic individuals revealed that only two of them (11.1 %) resembled the parental trisomic. A number of diploid and trisomic progenies exhibited a partial or a complete deletion of the satellited segment of chromosome 2.This work has been supported by a contract between the European Communities and the CNEN. This publication is contribution n ° 484 from The Division Applicazioni delle Radiazioni del CNEN and contribution n ° 1482 from the Biology Radioprotection Medical Research programme of the Directorate General XII of the European communities |
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Keywords: | Lycopersicum peruvianum Aneuploidy Primary Trisomics Transmission |
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