Báo cáo khoa học: Cold storage of in vitro cultures of wild chestnut and oak

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Báo cáo khoa học: "Cold storage of in vitro cultures of wild chestnut and oak" Note Cold storage of in vitro cultures of wild cherry, chestnut and oak LV Janeiro, AM Vieitez, A Ballester Investigaciones Agrobiológicas de Galicia (CSIC), Instituto de Apartado 122, 15080 Santiago de Compostela, Spain 4 October 1994) 13 March 1994; accepted (ReceivedSummary — Shoot cultures of chestnut, oak and wild cherry have been stored at low temperature (2°C)for 3, 6, 9 and 12 months. Cultures were stored immediately after the last subculture or 10 d later.Survival and morphogenetic parameters have been recorded at the end of each period of storage.Both survival and proliferation capacity of the explants were influenced by the timing of the transfer. Whenthe explants were stored 10 d after the subculture, higher percentages of survival and multiplication rateswere obtained. The 4 species studied may be maintained at 2°C for up to 1 year without subculturing. storage / in vitro conservation / oak / wild cherrychestnut / coldRésumé — Conservation au froid de pousses in vitro de merisier, châtaignier et chêne. Despousses en culture in vitro de châtaignier, de chêne et de merisier ont été conservées à basse tem-pérature (2°C) pendant 3, 6, 9 et 12 mois. Ces pousses furent stockées juste après le dernier repiquageou 10 j plus tard. Les taux de survie et les caractéristiques morphologiques ont été déterminées à lafin de chaque période de conservation. La survie comme la capacité de prolifération des explantssont influencées par la durée de la phase de transfert (tableaux I, II ; fig 1). Le stockage des explants10 japrès le repiquage s’est traduit par de forts taux de survie et de multiplication. Les 4 espècesétudiées peuvent être maintenues à 2°C pendant plus d’une année sans repiquage.châtaignier / chêne / merisier / culture in vitro / stockage au froid* and reprints CorrespondenceINTRODUCTION (Prunus avium L, clone 1),oak (Quercus petraea (Mattuschka) Lieblein, clone 1; Q robur L, clones NL3 and 7172) and chesnut (Castanea sativa x CCollections of seeds and clonal material are crenata Siebold & Zucc, clone M5).traditional ways of storing genetic resources. Wild cherry was routinely subcultured onUse of cold stored (0-10°C) in vitro cultures Murashige and Skoog (1962) medium supple-is a complementary method of maintaining mented with 4.44 μM 6-benzyladenine and 0.49 μM indolebutyric acid; oak and chestnut clonessuch genetic resources. In vitro conservation were subcultured on Gresshoff and Doy (1972)programs for forest trees are not as com- medium supplemented with 0.22 μM 6-benzyl-prehensive as they are for agricultural crops. adenine (except clone 7172, in which 0.44 μM 6-As mentioned by Millar (1993), the Interna- benzyladenine was used). All media were sup-tional Board for Plant Genetic Resources plemented with 30 g/l sucrose and 8 g/l Sigma(IBPGR) 1989 database reported only 8 tree agar. The pH was adjusted to 5.5-5.6 before autoclaving. All cultures were subcultured everyspecies that have been successfully stored month under standard growth conditions: a pho-and regrown under slow growth tissue cul- ton flux density of 30 μEm delivered during -1 s -2ture conditions. In contrast, it has been a 16 h day by cool white fluorescent lamps, withknown for many years that fruit tree cultures day and night temperatures of 25 and 20°C,can be stored at low temperatures for long ...