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Triploid banana cell growth phases and the correlation of medium pH changes with somatic embryogenesis in embryogenic cell suspension culture

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Abstract

Embryogenic cell suspensions of Musa AAA and AAB genomic groups were cultured in a maintenance culture medium for 17 generations (lasting for 238 days). The cell growth phases and medium pH changes were also observed correspondingly. Three major growth phases of AAA genomic group have been focused, namely cell releasing, proliferation and globularization phases. During almost all the subculture generations the cell stocks of AAB ‘Raja’ were continuously characterized by proliferating cell aggregates while the globularization phase occurred only for short duration. The medium acidity levels of the cell stocks of AAA ‘Pei-Chiao’ and ‘Robusta’ were commonly scattered in a wider range of pH 3.3–5.3, while the AAB ‘Raja’ were deviated in a narrow range of pH 4.0–4.6. After subculture, culture medium showed biphasic pH changes, which were drastic pH falls followed by an auto-regulated steady-state level. The steady-state pH values in each of the three growth phases (i.e. cell releasing, proliferation and globularization phases) were of 3.3–4.0, 4.0–4.8 and 4.8–5.3 respectively. Morphological bipolarity and the efficiency in the formation of somatic embryos have been thoroughly discussed. Reported research indicates that the condition of pH below 4.6 may prevent the development of embryogenic cells towards polar growth.

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Abbreviations

2,4-D:

2,4-dichlorophenoxyacetic acid

2iP:

Isopentenyladenosine

IAA:

Indole-3-acetic acid

NAA:

Naphthaleneacetic acid

PEMs:

Proembryogenic masses

SCV:

Settled cell volume

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Acknowledgments

This project was supported by a grant from National Science Council, Taipei Taiwan, R.O.C (NSC 87-2313-B-002-030). We thank Professor Shih-Yow Huang, Department of Chemical Engineering, NTU, for bioreactor technique advisor.

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Correspondence to Chou Tou Shii.

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Chung, JP., Chang, TL., Chi, A.YM. et al. Triploid banana cell growth phases and the correlation of medium pH changes with somatic embryogenesis in embryogenic cell suspension culture. Plant Cell Tiss Organ Cult 87, 305–314 (2006). https://doi.org/10.1007/s11240-006-9168-1

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