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Organogenesis from shoot segments and via callus of endangered Kosteletzkya pentacarpos (L.) Ledeb.

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Abstract

Efficient plant regeneration systems both from shoot segments and via callus organogenesis were developed for Kosteletzkya pentacarpos (L.) Ledeb., a rare and endangered Eurasian species. In the experiments with existing meristems, factors affecting shoot proliferation, including explant type, i.e. decapitated and intact shoots, and plant growth regulators, indole-3-acetic acid or kinetin, were investigated. Shoot proliferation was significantly affected by the type of explant, the hormones and their interaction. The highest shoot multiplication rate was obtained from decapitated shoots. Increasing kinetin concentration promoted shoot elongation regardless of explant type. In intact shoots, shoot length was also affected by increasing auxin concentration, although this effect tends to decrease with higher concentration. Decapitated shoots were not responsive to the addition of auxin. Micropropagation through organogenesis from callus was also investigated. Calli were obtained from leaf, stem internode and root explants. Only the leaf-derived calli produced shoots and indole-3-acetic acid favoured increased numbers of shoots. A number of experiments were conducted for rooting of in vitro produced shoots. All of them induced high rooting frequency, the number and the length of roots being dependent on the strength of the basal medium. The use of 1–2 mg l−1 indole-3-butyric acid resulted in refining the optimal concentration for root elongation. The regenerated plants (70%) survived and flowered in their first vegetative period.

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Abbreviations

B5 :

Gamborg medium

IAA:

Indole-3-acetic acid

IBA:

Indole-3-butyric acid

NAA:

α-Naphtaleneacetic acid

Kin:

Kinetin

MS:

Murashige and Skoog medium

2,4-D:

2,4-Dichlorophenoxyacetic acid

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Acknowledgments

This research was financially supported by MIUR (Ministero dell’Istruzione, dell’Università e della Ricerca, Italy, ex-60% funds).

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Correspondence to Raffaella Filippini.

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Piovan, A., Caniato, R., Cappelletti, E.M. et al. Organogenesis from shoot segments and via callus of endangered Kosteletzkya pentacarpos (L.) Ledeb.. Plant Cell Tiss Organ Cult 100, 309–315 (2010). https://doi.org/10.1007/s11240-009-9652-5

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