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Effects of agar concentration and vessel closure on the organogenesis and hyperhydricity of adventitious carnation shoots

  • Original Papers
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Biologia Plantarum

Abstract

Carnation plantlets (Dianthus caryophyllus L.) cultured in vitro often develop morphological and physiological anomalies, a phenomenon called hyperhydricity, which impairs their survival ex vitro. When the agar concentration of the growth medium was increased (from 0 to 12 g dm−3), thereby reducing water availability, the hyperhydricity of those adventitious shoots regenerated from carnation petals decreased. This was accompanied by a progressive fall in the water content of shoots (94.9 to 91.4 %), fresh mass (from 57.2 to 1.8 mg), number of leaf parenchyma cell layers (from 9.3 to 7.7), and the size of these cells (from 968 to 254 µm2). However, the number of regenerated shoots also decreased (17.7 in 2 g dm−3 agar to 4.3 in 12 g dm−3). Similarly, in ventilated tubes, which exhibit a lower relative humidity than tightly closed tubes, shoot organogenesis diminished up to 28 %, in tandem with shoot water content. Thus, relative humidity and water availability in culture vessels do not only influence shoot hyperhydricity in carnations, but also greatly affect adventitious shoot organogenesis.

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Abbreviations

DM:

dry matter

FM:

fresh matter

NAA:

1-naphthaleneacetic acid

RH:

relative humidity

TDZ:

thidiazuron (N-phenyl-N′-1,2,3-thiadiazol-5-ylurea)

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Authors and Affiliations

  1. Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Avgda. Diagonal 645, E-08028, Barcelona, Catalonia, Spain

    E. Casanova, L. Moysset & M. I. Trillas

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  1. E. Casanova
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  2. L. Moysset
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  3. M. I. Trillas
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Correspondence to E. Casanova.

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Casanova, E., Moysset, L. & Trillas, M.I. Effects of agar concentration and vessel closure on the organogenesis and hyperhydricity of adventitious carnation shoots. Biol Plant 52, 1–8 (2008). https://doi.org/10.1007/s10535-008-0001-z

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  • DOI: https://doi.org/10.1007/s10535-008-0001-z

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