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Optimizing embryogenic callus production and plant regeneration from `Tifton 9' bahiagrass seed explants for genetic manipulation

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Abstract

Bahiagrass (Paspalum notatum Flügge) is a warm season forage grass widely cultivated in southeastern U.S. and South America. The cultivar Tifton 9 has several desirable characteristics such as high forage yield, more vigor at the seedling stage, etc.; but its forage quality is very low. As an initial step for future genetic manipulations to improve its forage characteristics, we have optimized in vitro culture conditions for plant regeneration. In this report, we describe an efficient method for embryogenic callus induction and plant regeneration from bahiagrass (cv. Tifton 9) seed explants, which are readily available and easy to manipulate, compared to other explant sources reported in the literature.

Murashige and Skoog (MS) medium containing 30 μM dicamba and 5 μM 6-benzyladenine (BA) was optimal for callus induction and growth. Out of 9734 seeds cultured, 65.7% germinated and 21.4% produced embryogenic callus on this medium. Shoot formation was best when embryogenic calluses induced in this medium were transferred to MS medium supplemented with 5 μM BA and 1 μM gibberellic acid with 1640 plantlets formed per gram fresh weight of callus tissue. When transferred to hormone-free SH medium, shoot systems produced well-developed root systems. The resulting plantlets grew normally produced viable seeds when transferred to soil in the greenhouse. Histochemical staining for GUS activity arising from transient expression of the introduced uidA (β-glucuronidase) gene indicated that bahiagrass embryogenic callus produced by this method is suitable for gene transfer via biolistic bombardment; and it can serve as a good target tissue for future genetic manipulations to improve the forage quality of bahiagrass (cv. Tifton 9).

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Authors and Affiliations

  1. Department of Agronomy, University of Florida, P.O. Box 110300, Gainesvillle, FL, 32611-0300, USA

    Magali F. Grando & Robert G. Shatters Jr.

  2. Department of Biology, Savannah State University, P.O. Box 20600, Savannah, GA, 31404, USA

    Chandra I. Franklin

  3. USDA, ARS, USHRL, 2001 South Rock Rd, Fort Pierce, FL, 34945, USA

    Robert G. Shatters Jr.

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  1. Magali F. Grando
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  2. Chandra I. Franklin
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  3. Robert G. Shatters Jr.
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Correspondence to Robert G. Shatters Jr..

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Grando, M.F., Franklin, C.I. & Shatters, R.G. Optimizing embryogenic callus production and plant regeneration from `Tifton 9' bahiagrass seed explants for genetic manipulation. Plant Cell, Tissue and Organ Culture 71, 213–222 (2002). https://doi.org/10.1023/A:1020303522530

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