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Effects of plant growth regulators and l-glutamic acid on shoot organogenesis in the halophyte Leymus chinensis (Trin.)

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Abstract

The halophyte Leymus chinensis (Trin.) is a perennial rhizome grass (tribe Gramineae) that is widely distributed in China, Mongolia and Siberia, where it is produced as a forage product. In this report, we establish a highly reproducible plant regeneration system through somatic embryogenesis. Two explants, mature seeds and leaf base segments were used; these parts displayed different responses to combinations of growth factors that affect embryogenic callus induction, callus type optimization and plant regeneration. The highest callus induction frequency was obtained on Murashige and Skoog (MS) medium supplemented with 2.0 mg l−1 2,4-dichlorophenoxyacetic acid (2,4-D) in the presence of 5.0 mg l−1 l-glutamic acid. The inclusion of 5.0 mg l−1 l-glutamic acid was found to significantly promote primary callus induction, embryogenic callus formation and callus status improvement. Subculturing on maintenance medium for 1–2 months before plant regeneration was found to be essential for the optimization of callus type and the maturation of embryogenic callus. Callus relative water content and growth rate were simultaneously investigated during callus maintenance, and found to possibly be related to callus type. Shoots were differentiated from the embryogenic callus on the optimal medium with MS salts containing 0.2–0.5 mg l−1 α-naphthalene acetic acid (NAA), 2.0 mg l−1 kinetin (Kn) and 2.0 g l−1 casamino acids in 71.0 and 69.2% of wild-type (WT) and Jisheng No.1 (JS) plants, respectively. Plant regeneration was variable depending on NAA levels, and the addition of casamino acids stimulated the maturation of embryogenic callus and plant regeneration. Transferring callus with shoots onto half-strength MS medium resulted in rooting within 1 week. The growth of regenerated plants was also surveyed in the field. This is the first report of plant regeneration through somatic embryogenesis from mature seeds and leaf base segments of L. chinensis.

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Abbreviations

PAT:

Phosphinothricin acetyltransferase

LEA:

Late embryogenesis abundant

2,4-D:

2,4-Dichlorophenoxyacetic acid

Kn:

Kinetin

BA:

6-Benzyladenine

NAA:

α-Naphthalene acetic acid

WT:

Wild-type

JS:

Jisheng no. 1

MS:

Murashige and Skoog

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Acknowledgments

This work was supported by Nutraceutical Bio Brain Korea 21 Project Group.

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Authors and Affiliations

  1. Department of Plant Biotechnology, Division of Biotechnology, College of Biotechnology, Kangwon National University, Chuncheon, Kangwon-Do, 200-701, Korea

    Yan-Lin Sun & Soon-Kwan Hong

  2. Institute of Bioscience and Biotechnology, Kangwon National University, Chuncheon, Kangwon-Do, 200-701, Korea

    Soon-Kwan Hong

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  1. Yan-Lin Sun
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Correspondence to Soon-Kwan Hong.

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Sun, YL., Hong, SK. Effects of plant growth regulators and l-glutamic acid on shoot organogenesis in the halophyte Leymus chinensis (Trin.). Plant Cell Tiss Organ Cult 100, 317–328 (2010). https://doi.org/10.1007/s11240-009-9653-4

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