Abstract
The capacity of regeneration of adventitious shoots from leaf explants was studied in sour cherry ‘Čačanski Rubin’ (Prunus cerasus L.) and cherry rootstock Gisela 5 (P. cerasus × P. canescens). Regeneration assay included thirty different combinations of plant growth regulators. 6-benzyladenine (BA) and thidiazuron (TDZ) were applied either individually or each combined with different concentrations of indole-3-butyric acid, α-naphthaleneacetic acid (NAA) and 2,4-dichlorophenoxyacetic acid (2,4-D). ‘Čačanski Rubin’ showed higher regeneration capacity in comparison with Gisela 5 regarding the total number of treatments inducing regeneration as well as the highest frequency of regeneration achieved. In both genotypes, 8.9 μM BA was more effective than both 4.5 and 9.0 μM TDZ in inducing adventitious regeneration, but only when combined with auxins. The highest frequency of regeneration (20.8 %) in ‘Čačanski Rubin’ was achieved on medium supplemented with 8.9 μM BA combined with 5.4 μM NAA, while in Gisela 5 the highest value (8.3 %) was obtained when BA was combined with 4.5 μM 2,4-D. Flow cytometry combined with 4′-6-diamidino-2-phenylindole staining was employed to estimate DNA ploidy levels and relative nuclear DNA content in adventitious regeneration-derived shoots, in vitro shoots of axillary origin and in vivo control plants from open field. No significant differences in nuclear DNA content were detected among plants of different origin. Chromosome counting in root tip meristems also showed normal tetraploid chromosome number (2n = 4x = 32) in ‘Čačanski Rubin’ shoots and normal triploid chromosome number (2n = 3x = 24) in Gisela 5 shoots regenerated in vitro. The results obtained suggest that no major genetic instability occurred during adventitious regeneration under the described experimental conditions.
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Abbreviations
- BA:
-
6-benzyladenine
- CV:
-
Coefficient of variation
- 2,4-D:
-
2,4-dichlorophenoxyacetic acid
- DAPI:
-
4′-6-diamidino-2-phenylindole
- G0/G1 :
-
Resting phase of normal cell cycle
- GA3 :
-
Gibberellic acid
- IBA:
-
Indole-3-butyric acid
- MS:
-
Murashige and Skoog (1962)
- NAA:
-
α-naphthaleneacetic acid
- PGRs:
-
Plant growth regulators
- TDZ:
-
Thidiazuron (N-pheny-N′-1,2,3-thidiazol-5-ylurea)
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This work has been subsidized by Ministry of Education and Science of the Republic of Serbia (projects no. TR-20013A and TR-31064).
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Vujović, T., Cerović, R. & Ružić, D. Ploidy level stability of adventitious shoots of sour cherry ‘Čačanski Rubin’ and Gisela 5 cherry rootstock. Plant Cell Tiss Organ Cult 111, 323–333 (2012). https://doi.org/10.1007/s11240-012-0197-7
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DOI: https://doi.org/10.1007/s11240-012-0197-7