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2008 | 30 | 1 |
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Shoot meristem differentiation in shoot primordia culture (SPC) obtained from root primordia culture (RPC) of Solanum lycopersicoides Dun.

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We present a unique example of conversion of the morphogenesis type (from rhisogenesis to shoot organogenesis) in in vitro cultures of Solanum lycopersicoides. Liquid shoot primordia cultures (SPC) were obtained from root primordia culture (RPC) on two kinds of MS-based media with BA. The first SMS₈, contained a full set of organic compounds; the second, ²SMS₈, was devoid of organic compounds except sucrose and edamine. Two weeks after passage of RPC onto both the media, disintegration of root primordia and cell aggregates began. After 8 weeks of cultivation on SMS₈ and ²SMS₈ media, SPC aggregates developed from meristematic cells located near the vascular tissue of disintegrating RPC aggregates. Initiation of shoot meristems started from meristematic cells centers which were localised under the surface of the newly formed SPC aggregates. The change in the type of morphogenesis occurred faster on medium SMS₈, but the SPC on medium ²SMS₈ was characterized by more frequent formation of shoots and plants (45% of aggregates, in the case of SPC on medium SMS₈, and 90% in the case of SPC on medium ²SMS₈). This fact was correlated with the structural organization of the meristematic centers. Our results indicate that an RPC system has high morphogenetic potential due to the continual presence of meristematic cells. The change in the type of morphogenesis was followed by a rebuilding of the aggregate structure on the basis of the meristematic cells already existing in RPC, which gave rise to SPC aggregates from which shoot meristems developed.
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  • Institute of Biology, University of Bialystok, Swierkowa 20 B, 15-950 Bialystok, Poland
  • Department of Plant Genetics, Breeding and Biotechnology, SGGW, Nowoursynowska 166, 02-787 Warsaw, Poland
  • Department of Plant Morphogenesis, Warsaw University, Miecznikowa 1, 02-097 Warsaw, Poland
  • Department of Plant Genetics, Breeding and Biotechnology, SGGW, Nowoursynowska 166, 02-787 Warsaw, Poland
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