Abstract
A rapid and reproducible protocol for direct plant regeneration has been established using in vitro-derived, actively growing shoot apical meristems (SAMs) of the genotype 'CO(Ra)-14'. Shoot apical meristems from 3-day-old seedlings of three finger millet genotypes viz, 'CO(Ra)-14', 'Try-1', and 'Paiyur-2' were assessed for the efficiency of direct shoot induction. The regeneration efficiency of 'CO(Ra)-14' surpassed the other two genotypes and produced a mass of green, multiple shoots within 12 d on Murashige and Skoog medium containing 17.6 μM 6-benzylaminopurine (BA), 0.9 μM 2,4-dichlorophenoxyacetic acid in combination with 750 mg L−1 proline, 500 mg L−1 casein enzymatic hydrolysate, and 2 mg L−1 glycine. 'CO(Ra)-14' showed a maximum frequency of multiple shoot regeneration (96%) with an average of 8.3 shoots per explant. The age and size of shoot apical meristems played a crucial role in triggering adventitious shoot bud proliferation. The multiple shoot buds elongated spontaneously upon reducing the concentration of BA (to 11.0 μM) in the shoot induction medium. The in vitro proliferated shoots were rooted best in half-strength MS medium containing 2.8 μM indole-3-acetic acid and successfully acclimated in the field, subsequently developing into fertile plants. Thus, we report a short tenure (45 d) in vitro whole plant regeneration system, which could be effectively utilized for the production of transgenic finger millet plants.
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References
Ahmad A, Zhong H, Wang W, Sticklen MB (2002) Shoot apical meristem: In vitro regeneration and morphogenesis in wheat (Triticum aestivum L.). In Vitro Cell Dev Biol – Plant 38:163–167
Arockiasamy S, Ignacimuthu S (2007) Regeneration of transgenic plants from two indica rice (Oryza sativa L.) cultivars using shoot apex explants. Plant Cell Rep 26:1745–1753
Babu AG, Geetha KN, Manjunatha V, Shankar AG (2012) An efficient high throughput plant regeneration and transformation protocol for production of transgenics tolerant to salt in finger millet. Intl J Forestry Crop Improv 3:16–20
Barro F, Martin A, Lazzeri PA, Barcelo P (1999) Medium optimization for efficient somatic embryogenesis and plant regeneration from immature inflorescences and immature scutella of elite cultivars of wheat, barley and tritordeum. Euphytica 108:161–167
Bowman JL, Eshed Y (2000) Formation and maintenance of the shoot apical meristem. Trends Plant Sci 5:110–115
Burner DM, Grisham MP (1995) Induction and stability of phenotypic variation in sugarcane as affected by propagation procedure. Crop Sci 35:875–880
Ceasar SA, Ignacimuthu S (2008) Efficient somatic embryogenesis and plant regeneration from shoot apex explants of different Indian genotypes of finger millet (Eleusine coracana (L.) Gaertn.). In Vitro Cell Dev Biol – Plant 44:427–435
Ceasar SA, Ignacimuthu S (2009) Genetic engineering of millets: current status and future prospects. Biotechnol Lett 31:779–788
Ceasar SA, Ignacimuthu S (2010) Effects of cytokinins, carbohydrates and amino acids on induction and maturation of somatic embryos in kodo millet (Paspalum scorbiculatum Linn.). Plant Cell Tiss Organ Cult 102:153–162
Ceasar SA, Ignacimuthu S (2011) Agrobacterium-mediated transformation of finger millet (Eleusine coracana (L.) Gaertn.) using shoot apex explants. Plant Cell Rep 30:1759–1770
Cheng M, Hu T, Layton J, Liu CN, Fry JE (2003) Desiccation of plant tissues post-Agrobacterium infection enhances T-DNA delivery and increases stable transformation efficiency in wheat. In Vitro Cell Dev Biol – Plant 39:595–604
Cho MJ, Choi HW, Okamoto D, Zhang S, Lemaux P (2003) Expression of green fluorescent protein and its inheritance in transgenic oat plants generated from shoot meristematic cultures. Plant Cell Rep 21:467–474
Cho MJ, Yano H, Okamoto D, Kim HK, Jung HR, Newcomb K, Le VK, Yoo HS, Langham R, Buchanan BB, Lemaux PG (2004) Stable transformation of rice (Oryza sativa L.) via micro projectile bombardment of highly regenerative, green tissues derived from mature seed. Plant Cell Rep 22:483–489
Devi P, Zhong H, Sticklen MB (2000) In vitro morphogenesis of pearl millet [Pennisetum glaucum. (L.) R.Br.]: efficient production of multiple shoots and inflorescences from shoot apices. Plant Cell Rep 19:546–550
Dey M, Bakshi S, Galiba G, Sahoo L, Panda SK (2012) Development of a genotype independent and transformation amenable regeneration system from shoot apex in rice (Oryza sativa spp. indica) using TDZ. 3. Biotech 2:233–240
Eapen S, George L (1990) Influence of phytohormones, carbohydrates, amino acids, growth supplements and antibiotics on somatic embryogenesis and plant differentiation in finger millet. Plant Cell Tiss Organ Cult 22:87–93
George L, Eapen S (1990) High frequency plant-regeneration through direct shoot development and somatic embryogenesis from immature inflorescence cultures of finger millet (Eleusine coracana Gaertn). Euphytica 48:269–274
Gupta P, Raghuvanshi S, Tyahi AK (2001) Assessment of the efficiency of various gene promoters via biolistics in leaf and regenerating seed callus of millets, Eleusine coracana and Echinochloa crusgalli. Plant Biotechnol 18:275–282
Ignacimuthu S, Ceasar SA (2012) Development of transgenic finger millet (Eleusine coracana (L.) Gaertn.) resistant to leaf blast disease. J Biosci 37:135–147
Itoh JI, Sato Y, Nagato Y, Matsuoka M (2006) Formation, maintenance and function of the shoot apical meristem in rice. Plant Mol Biol 60:827–842
Jagga-Chugh SJ, Kachhwaha S, Sharma M, Kothari-Chajer A, Kothari SL (2012) Optimization of factors influencing microprojectile bombardment-mediated genetic transformation of seed-derived callus and regeneration of transgenic plants in Eleusine coracana (L.) Gaertn. Plant Cell Tiss Organ Cult 109:401–410
Karp A (1991) On the current understanding of somaclonal variation. In: Miflin BJ, Miflin HF (eds) Oxford surveys of plant molecular and cell biology. Oxford University Press, New York, pp 1–58
Karthikeyan A, Pandian STK, Ramesh M (2009) High frequency plant regeneration from embryogenic callus of a popular indica rice (Oryza sativa L.). Physiol Mol Biol Plants 15:371–375
Kothari SL, Agarwal K, Kumar S (2004) Inorganic nutrient manipulation for highly improved in vitro plant regeneration in finger millet—Eleusine coracana (L.) Gaertn. In Vitro Cell Dev Biol – Plant 40:515–519
Kumar S, Agarwal K, Kothari SL (2001) In vitro induction and enlargement of apical domes and formation of multiple shoots in finger millet, Eleusine coracana (L.) Gaertn and crowfoot grass, Eleusine indica (L.) Gaertn. Curr Sci 81:1482–1485
Labra M, Savini C, Bracale M, Pelucchi N, Colombo L, Bardini M, Sala F (2001) Genomic changes in transgenic rice (Oryza sativa L.) plants produced by infecting calli with Agrobacterium tumefaciens. Plant Cell Rep 20:325–330
Lakshmanan P, Geijskes RJ, Wang L, Elliott A, Grof CPL, Berding N, Smith GR (2006) Developmental and hormonal regulation of direct shoot organogenesis and somatic embryogenesis in sugarcane (Saccharum spp. interspecific hybrids) leaf culture. Plant Cell Rep 25:1007–1015
Latha AM, Rao KV, Reddy VD (2005) Production of transgenic plants resistant to leaf blast disease in finger millet (Eleusine coracana (L.) Gaertn). Plant Sci 169:657–667
Mallikarjuna K, Rajendrudu G (2007) High frequency in vitro propagation of Holarrhena antidysenterica from nodal buds of mature tree. Biol Plant 51:525–529
Mohanty BD, Gupta SD, Ghosh PD (1985) Callus initiation and plant regeneration in ragi (Eleusine coracana Gaertn.). Plant Cell Tiss Organ Cult 5:147–150
Murashige T, Skoog F (1962) A revised medium for rapid growth and bioassays with tobacco tissue cultures. Physiol Plant 15:473–497
Mythili PK, Satyavati V, Pavankumar G, Rao MVS, Manga V (1997) Genetic analysis of short term callus culture and morphogenesis in pearl millet, Pennisetum glacum. Plant Cell Tiss Organ Cult 50:171–178
Nhut DT, Le BV, Van KTT (2000) Somatic embryogenesis and direct shoot regeneration of rice (Oryza sativa L.) using thin cell layer culture of apical meristematic tissue. J Plant Physiol 157:559–565
Ozawa K, Komamine A (1989) Establishment of a system of high-frequency embryogenesis from long-term cell suspension cultures of rice (Oryza sativa L.). Theor Appl Genet 77:205–211
Piqueras A, Alburquerque N, Folta KM (2010) Explants used for the generation of transgenic plants. In: Kole C, Michler CH, Abbott AG, Hall TC (eds) Transgenic crop plants. Springer, Berlin Heidelberg, pp 31–56
Pius J, George L, Eapen S, Rao PS (1994) Influence of genotype and phytohormones on somatic embryogenesis and plant regeneration in finger millet. Proc Indian Natn Sci Acad B60(1):53–56
Poddar K, Vishnoi RK, Kothari SL (1997) Plant regeneration from embryogenic callus of finger millet Eleusine coracana (L.) Gaertn. on higher concentrations of NH4NO3 as a replacement of NAA in the medium. Plant Sci 129:101–106
Ramakrishnan M, Ceasar SA, Duraipandiyan V, Daniel MA, Ignacimuthu S (2013) Efficacious somatic embryogenesis and fertile plant recovery from shoot apex explants of onion (Allium cepa. L.). In Vitro Cell Dev Biol – Plant 49:285–293
Ramesh M, Murugiah V, Gupta AK (2009) Efficient in vitro plant regeneration via leaf base segments of indica rice (Oryza sativa L.). Indian J Exp Biol 47:68–74
Rangan TS (1976) Growth and plantlet regeneration in tissue cultures of some Indian millets: Paspalum scrobiculatum L., Eleusine coracana Gaertn. and Pennisetum typhoideum Pers. Zeitschrift für Pflanzenphysiologie 78:208–216
Sastri BN (1989) The wealth of india: a dictionary of indian raw materials and industrial products, Vol. III (D-E), Publication and Information Directorate. CSIR, New Delhi, pp 160–166
Sezgin M, Dumanoglu H (2014) Somatic embryogenesis and plant regeneration from immature cotyledons of European chestnut (Castanea sativa Mill.). In Vitro Cell Dev Biol – Plant 50:58–68
Sharma VK, Hansch R, Mendel RR, Schulze J (2004) A highly efficient plant regeneration system through multiple shoot differentiation from commercial cultivars of barley (Hordeum vulgare L.) using meristematic shoot segments excised from germinated mature embryos. Plant Cell Rep 23:9–16
Sharma M, Kothari-Chajer A, Jagga-Chugh S, Kothari SL (2011) Factors influencing Agrobacterium tumefaciens-mediated genetic transformation of Eleusine coracana (L.) Gaertn. Plant Cell Tiss Organ Cult 105:93–104
Srivastav S, Kothari SL (2002) Embryogenic callus induction and high frequency plant regeneration in pearl millet. Cer Res Commun 30:69–74
Sticklen MB, Oraby HF (2005) Shoot apical meristem: a sustainable explant for genetic transformation of cereal crops. In Vitro Cell Dev Biol – Plant 41:187–200
Yemets AI, Klimkina LA, Tarassenko LV, Blume YB (2003) Efficient callus formation and plant regeneration of goosegrass (Eleusine indica (L.) Gaertn.). Plant Cell Rep 21:503–510
Yoshida S, Forno DA, Cock JH, Gomez KA (1976) Laboratory manual for physiological studies of rice. International Rice Research Institute, Manila (Philippines)
Zhang S, Zhang H, Zhang MB (1996) Production of multiple shoots from shoot apical meristems of oat (Avena sativa L.). J Plant Physiol 148:667–671
Zhang S, Cho MJ, Koprek T, Yun R, Bregitzer P, Lemaux PG (1999) Genetic transformation of commercial cultivars of oat (Avena sativa L.) and barley (Hordeum vulgare L.) using in vitro shoot meristematic cultures derived from germinated seedlings. Plant Cell Rep 18:959–966
Zhong H, Srinivasan C, Sticklen MB (1992) In vitro morphogenesis of corn (Zea mays L.). I. Differentiation of multiple shoot clumps and somatic embryos from shoot tips. Planta 187:483–489
Zhong H, Sun B, Warkentin D, Zhang S, Wu R, Wu T, Sticklen MB (1996) The competence of maize shoot meristems for integrative transformation and inherited expression of transgenes. Plant Physiol 110:1097–1107
Zhong H, Wang W, Sticklen MB (1998) In vitro morphogenesis of Sorghum bicolor (L.) Moench: efficient plant regeneration from shoot apices. J Plant Physiol 153:719–726
Acknowledgments
The author L. Satish sincerely thanked the University Grants Commission, New Delhi, India, for financial support in the form of UGC-BSR fellowship. We thank the Department of Small Millets, Millet Research Station, Tamil Nadu Agricultural University for providing seed material used in the present study. Also, the authors gratefully acknowledge the Bioinformatics Infrastructure Facility of Alagappa University (funded by the Department of Biotechnology, Government of India: Grant No. BT/BI/25/001/2006) for providing the computational facility.
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Satish, L., Ceasar, S.A., Shilpha, J. et al. Direct plant regeneration from in vitro-derived shoot apical meristems of finger millet (Eleusine coracana (L.) Gaertn.). In Vitro Cell.Dev.Biol.-Plant 51, 192–200 (2015). https://doi.org/10.1007/s11627-015-9672-2
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DOI: https://doi.org/10.1007/s11627-015-9672-2