Involvement of ethylene on growth and plant regeneration in callus cultures of Heliconia psittacorum L.f.

Abstract

The level of ethylene accumulated in morphogenic callus cultures of Heliconia psittacorum L.f. was only one quarter that of non-morphogenic cultures. The rate of ethylene production in the morphogenic callus cultures during early stages of differentiation of protocorm-like bodies leading to plantlet regeneration was lo-fold higher than that during callus proliferation. In cultures sealed with gastight serum caps, fresh weight gain was reduced 2-to 3-fold compared to those that were closed with Kaput&). Treatment with l-aminocyclopropane-1-carboxylic acid (2 100 PM) caused complete inhibition of plant regeneration from the morphogenic callus on subsequent culture under inductive conditions. Silver nitrate and aminoethoxyvinylglycine also reduced plant regeneration. These results indicate that while high levels of ethylene were inhibitory, a low level of endogenous ethylene production may be necessary during the plant regeneration phase in callus cultures of Heliconia.Abbreviations: 24-D = 2,4-dichlorophenoxyacetic acid; AC = activated charcoal; ACC = 1 -aminocyclopropane-I-carboxylic acid; AVG = aminoethoxyvinylglycine; BM = basal medium; CH = casein hydrolysate; DM = development medium; MM = maintenance medium; PLB = protocorm-like body

In vitro control of adventitious bud differentiation by inorganic medium components and silver thiosulfate in explants of Passiflora edulis F. flavicarpa

“…The effects of ethylene on explant growth and morphogenesis seem to be species-specific. This hormone may promote organogenesis or embryogenesis in some plant species (Kumar et al, 1987(Kumar et al, , 1996Dimasi-Theriou et al, 1993), while in others it may have an inhibitory effect (Chraibi et al, 1991;Plus et al, 1993;Burnett et al, 1994). Although the use of ethylene inhibitors in in vitro cultures has produced contradictory results (Krikorian, 1995), several reports (Perl et al, 1988;Hulme et al, 1992;Moilers et al, 1992) have demonstrated the suitability of STS as an inhibitor of ethylene action.…”