title: Biochemical characterization of ecuadorian wild Solanum lycopersicum Mill. plants produced from non-cryopreserved and cryopreserved seeds.
abstract: This paper presents some of the effects of cryopreservation of wild Solanum lycopersicum Mill. seeds on the early stages of germination post liquid nitrogen exposure. Percentage of germination, conversion into plantlets and plant fresh mass were evaluated after cryostorage. Levels of chlorophyll pigments (a, b, total), malondialdehyde, other aldehydes, phenolics (cell wall-linked, free, and total) and proteins were determined. Peroxidase and superoxide dismutase activities were recorded. Liquid nitrogen exposure increased the percentage of seed germination at 5 days but at 7 days, the conversion into plantlets and the plant fresh mass were not statistically different between non-cryopreserved and cryopreserved samples. Several significant effects of cryopreservation were recorded at the biochemical level at 7 days of germination under controlled conditions. Highly significant effects due to liquid nitrogen exposure were observed in leaves: increased levels of peroxidase enzymatic and specific activities and cell wall-linked phenolics. Very remarkable effects were also recorded in roots: decreased contents of chlorophylls and cell wall-linked phenolics.
authors.affiliation: Campus Politecnico El Limon, Carrera de Ingenieria Agricola, Calceta, Manabi, Ecuador. bzevallos@espam.edu.ec
authors.forename: B
authors.initials: B
authors.lastname: Zevallos
authors.forename: I
authors.initials: I
authors.lastname: Cejas
authors.forename: R C
authors.initials: RC
authors.lastname: Rodriguez
authors.forename: L
authors.initials: L
authors.lastname: Yabor
authors.forename: C
authors.initials: C
authors.lastname: Aragon
authors.forename: J
authors.initials: J
authors.lastname: Gonzales
authors.forename: F
authors.initials: F
authors.lastname: Engelmann
authors.forename: M E
authors.initials: ME
authors.lastname: Martinez
authors.forename: J C
authors.initials: JC
authors.lastname: Lorenzo
mesh_terms: D002734:Chlorophyll / Q000032:analysis / Q000378:metabolism; D015925:Cryopreservation / Q000379:methods; D018525:Germination; D018551:Solanum lycopersicum / Q000254:growth & development* / Q000378:metabolism*; D008315:Malondialdehyde / Q000032:analysis / Q000378:metabolism; D009195:Peroxidase / Q000032:analysis / Q000378:metabolism; D010636:Phenols / Q000032:analysis / Q000378:metabolism; D018515:Plant Leaves / Q000254:growth & development / Q000378:metabolism; D010940:Plant Proteins / Q000032:analysis / Q000378:metabolism; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism; D018520:Plant Shoots / Q000254:growth & development / Q000378:metabolism; D012639:Seeds / Q000254:growth & development / Q000378:metabolism; D013482:Superoxide Dismutase / Q000032:analysis / Q000378:metabolism
chemical_list: D010636:Phenols; D010940:Plant Proteins; D002734:Chlorophyll; D008315:Malondialdehyde; D009195:Peroxidase; D013482:Superoxide Dismutase