{"title":"Nature of sterility and mechanism of the evolution of higher ploidy in Solanum section Solanum (Maurella)","authors":"A. Ganapathi, G. R. Rao","doi":"10.1139/G86-146","DOIUrl":null,"url":null,"abstract":"Cytomorphology of solanum nigrum L. (2n = 6x = 72) and S. americanum Mill. (2n = 2x = 24) was studied. Crosses were made between these two species, but crosses were successful only when the higher ploidy form was used as the maternal parent. The F1 hybrid was a tetraploid (2n = 4x = 48) and showed highly irregular meiosis. It did not set fruit either on selfing or on open pollination. A fertile octoploid branch spontaneously grew from the sterile hybrid. The octoploid had regular meiosis and produced several fruits with viable seeds. Pollen stainability was 82%. From cytological studies of the tetraploid and its amphiploid, it is concluded that hybridization and polyploidy have played a significant role in the origin and evolution of higher chromosomal forms of Solanum section Solanum (Maurella).Key words: Solanum, polyploid, sterility.","PeriodicalId":9589,"journal":{"name":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","volume":"50 1","pages":"1044-1048"},"PeriodicalIF":0.0000,"publicationDate":"1986-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1139/G86-146","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3
Abstract
Cytomorphology of solanum nigrum L. (2n = 6x = 72) and S. americanum Mill. (2n = 2x = 24) was studied. Crosses were made between these two species, but crosses were successful only when the higher ploidy form was used as the maternal parent. The F1 hybrid was a tetraploid (2n = 4x = 48) and showed highly irregular meiosis. It did not set fruit either on selfing or on open pollination. A fertile octoploid branch spontaneously grew from the sterile hybrid. The octoploid had regular meiosis and produced several fruits with viable seeds. Pollen stainability was 82%. From cytological studies of the tetraploid and its amphiploid, it is concluded that hybridization and polyploidy have played a significant role in the origin and evolution of higher chromosomal forms of Solanum section Solanum (Maurella).Key words: Solanum, polyploid, sterility.