Daylength and photon flux density influence the growth regulator effects on morphogenesis in epicotyl segments of Troyer citrange
Identifieur interne : 002D74 ( Main/Exploration ); précédent : 002D73; suivant : 002D75Daylength and photon flux density influence the growth regulator effects on morphogenesis in epicotyl segments of Troyer citrange
Auteurs : J. M Moreira-Dias [Espagne] ; R. V Molina [Espagne] ; J. L Guardiola [Espagne] ; A. Garc A-Luis [Espagne]Source :
- Scientia Horticulturae [ 0304-4238 ] ; 2001.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
- 1-Naphthaleneacetic acid, Adventitious shoots, Application method, Citrus sinensis×Poncirus trifoliata, Daylength, Direct organogenesis, Epicotyl, Growth, Growth regulators, Indirect organogenesis, Luminous intensity, Micropropagation, Morphogenesis, Organogenesis, Photon flux density, Photoperiod, Regeneration, Troyer citrange.
Abstract
The optimal growth regulator addenda for adventitious shoot regeneration in epicotyl cuttings of Troyer citrange (Citrus sinensis×Poncirus trifoliata) varied with the conditions of illumination. The response to illumination and to growth regulators differed for the direct and the indirect (through callusing) pathways of regeneration. Shoot formation through the direct organogenic pathway decreased as the concentration of benzyladenine (BA) in the medium was increased in the range 2.2–22μM, when the explants were incubated in the dark or under an 8h daylength. For explants incubated under a 16h daylength, the number of shoots formed increased with BA concentration. Optimal conditions of incubation for shoot formation through the direct pathway were either an 8h daylength with a photon flux density of 74μmolm−2s−1 in the presence of 2.2μM BA, or a 16h daylength with a photon flux density of 37μmolm−2s−1 in the presence of 22μM BA. Irrespective of the conditions of incubation, shoot formation through the indirect organogenic pathway was suppressed by the addition of 22μM BA to the medium. Optimal conditions for shoot formation through this pathway were incubation under an 8h daylength at a photon flux density of 74μmolm−2s−1 in the presence of 2.2μM BA. At the optimal conditions indicated, the addition of the synthetic auxin naphtaleneacetic acid (0.54μM) reduced shoot formation. Irrespective of the pathway of regeneration, the number of shoots formed decreased markedly with the distance of the cutting from the cotyledonary node.
Url:
DOI: 10.1016/S0304-4238(00)00186-2
Affiliations:
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Le document en format XML
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The response to illumination and to growth regulators differed for the direct and the indirect (through callusing) pathways of regeneration. Shoot formation through the direct organogenic pathway decreased as the concentration of benzyladenine (BA) in the medium was increased in the range 2.2–22μM, when the explants were incubated in the dark or under an 8h daylength. For explants incubated under a 16h daylength, the number of shoots formed increased with BA concentration. Optimal conditions of incubation for shoot formation through the direct pathway were either an 8h daylength with a photon flux density of 74μmolm−2s−1 in the presence of 2.2μM BA, or a 16h daylength with a photon flux density of 37μmolm−2s−1 in the presence of 22μM BA. Irrespective of the conditions of incubation, shoot formation through the indirect organogenic pathway was suppressed by the addition of 22μM BA to the medium. Optimal conditions for shoot formation through this pathway were incubation under an 8h daylength at a photon flux density of 74μmolm−2s−1 in the presence of 2.2μM BA. At the optimal conditions indicated, the addition of the synthetic auxin naphtaleneacetic acid (0.54μM) reduced shoot formation. Irrespective of the pathway of regeneration, the number of shoots formed decreased markedly with the distance of the cutting from the cotyledonary node.</div></front></TEI><affiliations><list><country><li>Espagne</li></country><region><li>Communauté valencienne</li></region></list><tree><country name="Espagne"><region name="Communauté valencienne"><name sortKey="Moreira Dias, J M" sort="Moreira Dias, J M" uniqKey="Moreira Dias J" first="J. M" last="Moreira-Dias">J. M Moreira-Dias</name></region><name sortKey="Garc A Luis, A" sort="Garc A Luis, A" uniqKey="Garc A Luis A" first="A" last="Garc A-Luis">A. Garc A-Luis</name><name sortKey="Garc A Luis, A" sort="Garc A Luis, A" uniqKey="Garc A Luis A" first="A" last="Garc A-Luis">A. Garc A-Luis</name><name sortKey="Guardiola, J L" sort="Guardiola, J L" uniqKey="Guardiola J" first="J. L" last="Guardiola">J. L Guardiola</name><name sortKey="Molina, R V" sort="Molina, R V" uniqKey="Molina R" first="R. V" last="Molina">R. V Molina</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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