Abstract
Isolated microspore culture experiments were carried out in sweet pepper (Capsicum annuum L.) F1 hybrid genotypes. In the first experiment, four culture media (W14, B5, MS and NLN) were compared to test their effectiveness in inducing the formation of microspore-derived structures in two genotypes. The experiments revealed the superiority of B5 medium. In the second experiment, the effects of different ratios of 2,4-dichlorophenoxyacetic acid (2,4-D) (0, 0.1, 0.2 and 0.5 mg l−1) and kinetin (0, 0.2 and 0.5 mg l−1) were also investigated in B5 medium with two genotypes. The effect of growth regulators were investigated on the production of microspore-derived calli and embryo-like structures (ELSs), the ratio of the two and plant regeneration (number of regenerated plantlets) in microspore culture. The histological experiments revealed the differences between the microspore-derived ELSs and calli. The most promising results were obtained on the investigated parameters in the presence of 0.1 mg l−1 2,4-D and 0.2 mg l−1 kinetin producing the highest number of plantlets in both genotypes tested. In the response of 11 genotypes, the androgenesis induction was successful in each sweet pepper genotypes tested using the best basic medium and growth regulators combination. In case of 11 genotypes, the number of ELSs ranged from 20 to 100/Petri dish (an average of 48.1 ELS/Petri dish), while the number of green plantlets varied from 0 to 8 plantlets/Petri dish (an average of 1.5 plantlets/Petri dish) depending on the genotype. The spontaneous rediploidization rate obtained was 25% in isolated microspore.
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Abbreviations
- 2,4-D:
-
2,4-Dichlorophenoxyacetic acid
- DH:
-
Doubled haploid
- ELS:
-
Embryo-like structure
- LSD:
-
Least significant difference
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Acknowledgments
This work was supported by the Hungarian-Romanian Cross-border Co-operation Programme, 2007–2013 (HURO/0801/143, acronym: RedpepperTRD) and National Office for Research and Technology—Hungarian Scientific Research Fund (OTKA CK80719 and OTKA CK80766). The authors thank Szilvia Palaticki, Zsuzsanna Kun, Ferenc Markó for their conscientious work.
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Lantos, C., Gémes Juhász, A., Vági, P. et al. Androgenesis induction in microspore culture of sweet pepper (Capsicum annuum L.). Plant Biotechnol Rep 6, 123–132 (2012). https://doi.org/10.1007/s11816-011-0205-0
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DOI: https://doi.org/10.1007/s11816-011-0205-0