Browsing by Author "CORTES, I"

Now showing 1 - 6 of 6
  • No Thumbnail Available
    Item
    POTENTIALITIES OF CELL AND CALLUS-TISSUE CULTURE TO REGENERATE 2 MESQUITE SPECIES (PROSOPIS-TAMARUGO AND PROSOPIS-CHILENSIS)
    (1987) JORDAN, M; CORTES, I; GOREUX, A
    Morphogenetic events in Prosopis tamarugo and P. chilensis calli and cell suspensions were studied in in vitro conditions. Under several growth conditions tested a generalized browning effect in tissues were observed. This effect was partially reduced by the use of cysteine in media. In P. tamarugo, shoot-like structures developed from calli after several subcultures. In P. chilensis, cell suspensions were able to form cell clusters and later on somatic embryoids. At present morphogenetic responses observed in both species occurred in a low frequency.
  • No Thumbnail Available
    Item
    REGENERATION OF LAPAGERIA ROSEA PLANTLETS BY TISSUECULTURE (FAMILY PHILESIACEAE)
    (1983) Jordán Zimmerman, Miguel; CORTES, I; Montenegro Rizzardini, Gloria
  • Thumbnail Image
    Item
    REGENERATION OF PLANTLETS BY EMBRYOGENESIS FROM CALLUSCULTURES OF CARICACANDAMARCENSIS
    (1983) Jordán Zimmerman, Miguel; CORTES, I; Montenegro Rizzardini, Gloria
  • No Thumbnail Available
    Item
    SHOOT DIFFERENTIATION FROM NODE EXPLANTS OF LAPAGERIAROSEA COPIHUE CULTIVATED INVITRO
    (1981) Jordán Zimmerman, Miguel; Montenegro Rizzardini, Gloria; CORTES, I
  • No Thumbnail Available
    Item
    SHOOT ORGANOGENESIS IN TISSUE-CULTURE OF DRIMYS-WINTERI
    (1981) JORDAN, M; CORTES, I
    Calluses from stem explants of D. winteri Forst. (Winteraceae) initiated shoot organogenesis in vitro in hormone-containing media under light exposure. Shoots formed from callus-derived outgrowths and from the superficial callus layers of the explants. Light inhibited callus initiation but promoted growth of established cultures. Root organogenesis did not occur under any of various hormonal conditions. Active synthesis of anthocyanins was observed in morphogenetic tissue. [Plant tissue culture, its limitations and potential use in forest improvement was recently discussed. D. winteri Forst. (Winteraceae) is a representative tree species of the evergreen forest in southern Chile (40.degree. S latitude). As a fast growing species, it might become an alternative source of wood in the near future.].
  • No Thumbnail Available
    Item
    TRISTERIX-TETRANDRUS (LORANTHACEAE) AND ITS HOST-PLANTS IN THE CHILEAN MATORRAL - PATTERNS AND MECHANISMS
    (1986) HOFFMANN, AJ; FUENTES, ER; CORTES, I; LIBERONA, F; COSTA, V
    Interactions between a Chilean mistletoe, quintral (Tristerix tetrandrus, Loranthaceae) and its potential host plants were studied at a site with mediterranean type climate. The results show that the distribution of T. tetrandrus is related to the behaviour of avian dispersers, which feed on its fruit, and evacuate the seeds at random in the field, but the distribution is also influenced by microenvironmental conditions, survival of seedlings is hampered at drier locations. The infection capacity of the seeds is increased after birds have eliminated the fruit coat. Survival of T. tetrandrus seeds differed depending on the species to which they were attached experimentally. Seeds germinated, and plants developed on Colliguaya odorifera and Kageneckia oblonga, previously reported as susceptible to infection. Survival was significantly higher on C. odorifera, although in the field it is infected less frequently than K. oblonga. In species on which no T. tetrandrus has been previously reported, resistance to infection might be ascribed to different mechanisms: in Quillaja saponaria, differentiation of cork layers apparently prevents penetration by haustoria; in Lithraea caustica haustoria enter the cortex and phloem, but no further development ensues. K. oblonga seldom bears more than one T. tetrandrus plant. Experimental inoculations showed that significantly more seeds developed into plants on K. oblonga individuals not previously infected with quintral, suggesting that they become resistant to infection.