Abstract
Efficient plant regeneration is essential for successful transformation and in vitro polyploidy induction in mulberry. A high frequency (80%) of plant regeneration from hypocotyls occurred under in vitro conditions in mulberry (Morus multicaulis Poir.). We identified three key factors for enhancing successful regeneration based on earlier work: (1) hypocotyl position, (2) the combination and concentration of growth regulators, and (3) the addition of AgNO3. The highest frequency of shoot regeneration was achieved using hypocotyl segments, which are proximal to apical meristems, and the optimal culture conditions were Murashige and Skoog’s (MS) (Murashige and Skoog, 1962) basal medium supplemented with 3.0 mg l−1 6-benzylamino purine, 0.3 mg l−1 indole-3-acetic acid, 0.1% polyvinypyrrolidone, and 1.0 mg/l silver nitrate (AgNO3) under subdued light at 25 ± 2°C. Treating the shoots with 0.2% colchicine (dipping for 72 h) resulted in a 14% tetraploid frequency, whereas a 20% tetraploid frequency resulted from using a 0.25% colchicine (dripping for 5 d) treatment, as determined by chromosome number counts. The diploid plant chromosome number was 28 (2n = 2x = 28) and that of tetraploid plants was 56 (2n = 4x = 56). Regenerated shoots rooted easily in 8–10 d using half-strength basal MS medium with 0.5 mg l−1 indole-3-butyric acid and were successfully established in the soil.
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Akasaka-Kennedy Y.; Tomita K.; Ezura H. Efficient plant regeneration and Agrobacterium-mediated transformation via somatic embryogenesis in melon (Cucumis melo L.). Plant Science 166: 763–769; 2004.
Bhatnagar S.; Kapur A.; Khurana P. TDZ-mediated differentiation in commercially valuable Indian mulberry, Morus indica cultivars K2 and DD. Plant Biotechnol 18: 61–65; 2001.
Chakraborti S. P.; Vijayan K.; Roy B. N.; Qadri S. M. H. In vitro induction of tetraploidy in mulberry (Morus alba L.). Plant Cell Reports 17: 799–803; 1998.
Chitra D. S.; Padmaja G. Clonal propagation of mulberry (Morus indica L. cultivar M-5) through in vitro culture of nodal explants. Sci Hort 80: 289–298; 1999.
Chitra D. S.; Padmaja G. Seasonal influence on axillary bud sprouting and micropropagation of elite cultivars of mulberry. Scientia Horticulturae 92: 55–68; 2002.
Das B. C.; Prasad D. N.; Sikdar A. K. Colchicine induced tetraploids of mulberry. Caryologia 23: 283–293; 1970.
Dwivedi N. K.; Sikdar A. K.; Dandin S. B.; Sastri C. R.; Jolly M. S. Induced tetraploidy in mulberry. I: morphological, anatomical and cytological investigations in cultivar ‘RFS-135’. Cytologia 51: 393–401; 1986.
Eapen S.; George L. Plant regeneration from peduncle segments of oil seed Brassica species: influence of silver nitrate and silver thiosulfate. Plant Cell Tiss Org Cult 51: 229–232; 1997.
Ercisli S; Orhan E. Nature mulberry (Morus spp.) production in Erzurum region in Turkey. In: Proceedings of the international scientific conference ‘environmentally friendly fruit growing’, 7–9 September 2005. Taru, Estonia, pp 129–136; 2005.
Funabiki K. On the relationship between frequency of polyploid species and latitude and warmth index. La Kromosomo 57: 1876–1882; 1964.
Gamborg O. L.; Murshige T.; Thorpe T. A.; Vasil I. K. Plant tissue culture media. In Vitro 12: 473–478; 1976.
Gu X. F.; Yang A. F.; Meng H.; Zhang J. R. In vitro induction of tetraploid plants from diploid Zizyphus jujube Mill. cv. Zhanhua. Plant Cell Rep 24: 671–676; 2005.
Hameda S. Polyploid mulberry trees in practice. Indian J Sericult 1: 3–4; 1963.
Hossain M.; Rahman S. M. Micropropagation of Morus laevigata wall from mature trees. Plant Cell Rep 11: 522–524; 1992.
Lin J. Y.; Tang C. Y. Determination of total phenolics and flavoniod contents in selected fruits and vegetables, as well as their stimulatory effects on mouse splenocyte proliferation. Food Chemistry 101(1): 140–147; 2007.
Mhatre M.; Bapat V. A.; Rao P. S. Regeneration of plantlets from the culture of leaves and axillary buds in mulberry(Morus indica L). Plant Cell Rep 4: 78–80; 1985.
Mizukami M.; Takeda T.; Satonaka H.; Matsuoka H. Improvement of propagation frequency with two-step direct somatic embryogenesis from carrot hypocotyls. Bioch Engineer J 38: 55–60; 2008.
Murashige T.; Skoog F. A revised medium for rapid growth and bioassay with tobacco tissue cultures. Physiol Plant 15: 473–497; 1962.
Nakamura Y.; Watanabe S.; Miyake N.; Kohno H.; Osawa T. Dihydrochalcones: evaluation as novel radical scavenging antioxidants. Journal of Agricultural and Food Chemistry 51: 3309–3312; 2003.
Ohyama K.; Oka S. Mulberry. In: Bonga J. M.; Durzan D. J. (eds) Cell and Tissue Culture in Forestry, vol.3. Nijhoff/Junk Publishers, Dordrecht, pp 272–284; 1987.
Pattnaik S. K.; Chand P. K. Rapid clonal propagation of three mulberries, Morus cathyana Hemsl., M. lhou Koidz. and M. serrata Roxb., through in vitro culture of apical shoot buds and nodal explants from mature trees. Plant Cell Rep 16: 503–508; 1997.
Rubuluza T.; Nikolova R. V.; Smith M. T.; Hannweg K. In vitro induction of tetraploids in Colophospermum mopane by colchicine. South Africa Journal of Botany 73: 259–261; 2007.
Sikdar A. K.; Jolly M. S. Induced polyploidy in mulberry (Morus spp.): induction of tetraploids. Sericologia 34: 105–116; 1994.
Sengul M.; Ertugay M. F.; Segul M. Biological, physical and chemical characteristics of mulberry pekmes. Food Control 16: 73–76; 2005.
Sezai E.; Emine O. Chemical composition of white (Morus alba), red (Morus rubra) and black (Morus nigra) mulberry fruits. Food Chemistry 103: 1380–1384; 2007.
Tapiero H.; Tew K. D.; Ba G. N.; Mathe G. Polyphenols: do they play a role in the prevention of human pathologies? Biomedicine & Pharmacotherapy 56: 200–207; 2002.
Thao N. T. P.; Ureshino K.; Miyajima I.; Ozaki Y.; Okubo H. Induction of tetraploids in ornamental Colocasia through colchicine and oryzalin treatments. Plant Cell Tissue and Organ Culture 72: 19–25; 2003.
Verma R. C.; Sarkar A.; Sarkar S. Induced amphidiploids in mulberry. Curr Sci 55: 1203–1204; 1986.
Wei X. P.; Gou X. P.; Yuan T.; Russell S. D. A highly efficient in vitro plant regeneration system and Agrobacterium-mediated transformation in Plumbago zeylanica. Plant Cell Rep 25: 513–521; 2006.
Yang J. H. Induction of Tetraploidy and its Application in Mulberry (Morus spp.). Acta Sericologica Sinica 30(1): 6–10; 2004.
Zhang Z. H.; Dai H. Y.; Xiao M.; Liu X. In vitro induction of tetraploids in Phlox subulata L. Euphytica 159: 59–65; 2008.
Acknowledgments
We are grateful to Ph.D. Dwight T for the critical reading of the manuscript and the fruitful comments, along with his enjoyable friendship and to the two anonymous reviewers whose pieces of advice permitted us to improve our paper. Funding for this research was provided by item of Scientific Research Fund For Doctor of Southwest University (swu109019) and Natural Science Foundation Project of CQ CSTC.
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Xi-Ling, W., Jin-Xing, Z., Mao-De, Y. et al. Highly efficient plant regeneration and in vitro polyploid induction using hypocotyl explants from diploid mulberry (Morus multicaulis Poir.). In Vitro Cell.Dev.Biol.-Plant 47, 434–440 (2011). https://doi.org/10.1007/s11627-010-9328-1
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DOI: https://doi.org/10.1007/s11627-010-9328-1