01761naa a2200217 a 450000100080000000500110000800800410001910000200006024501170008026000090019752010960020665000260130265000220132865000190135065000220136965000220139165300210141365300180143470000190145277300720147111543172018-09-11       2004    bl uuuu     u00u1 u    #d1 aAMBROSIO, S. T.  aInteraction between sucrose and pH during in vitro culture of Nephrolepis biserrata (Sw.) Schott (Pteridophyta).  c2004  aInteraction between sucrose and pH during in vitro culture of Nephrolepis biserrata (Sw.) Schott (Pteridophyta)). The present work reports the effect of different pH and sucrose concentrations on in vitro propagation of Nephrolepis biserrata. Fronds aseptically obtained from stolon segment culture were cultivated in MS semi-solid medium supplemented with 0, 15, 30, 45 and 60 g.L -1 sucrose and pH adjusted to 3, 5, 7 and 9, in a factorial design. Frond number and length, pinnae number, raquis length and diam eter, fresh and dry matter weight were measured. Inhibition of shoot and leaf regeneration was observed in all the pH treatments in the abs ence of sucrose. On the other hand, when sucrose was added to the medium, the shoot number increased, reaching the maximum average values of 51.25 and 38.25 shoot per explant at pH 5 and 7, respectively. Sucrose concentrations from 15 to 45g.L -1 increased leaf length and diameter and the pH 9 did not affect the dry matter weight, and was still not adequate for development of new fronds. Young sporophytes were successfully acclimated.  aNephrolepis biserrata  aOrnamental plants  aTissue culture  aCultura de Tecido  aPlanta Ornamental  aCultivo in vitro  aPteridófitas1 aMELO, N. F. de  tActa Botanica Brasilica, São Paulogv. 18, n. 4, p. 809-813, 2004.