Plant regeneration from protoplasts isolated from friable embryogenic callus of cassava |
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Authors: | E Sofiari C J J M Raemakers J E M Bergervoet E Jacobsen R G F Visser |
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Institution: | (1) Graduate School of Experimental Plant Sciences, Department of Plant Breeding, Wageningen Agricultural University, P. O. Box 386, 6700 AJ Wageningen, The Netherlands, NL |
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Abstract: | Protoplasts were isolated from friable embryogenic callus (FEC) and from suspensions derived from FEC of cassava genotype
TMS60444. Suspensions yielded the highest number of protoplasts (1.5×106 protoplasts/g fresh weight). Protoplasts plated at a density of 105–106/ml in a medium supplemented with 0.5 mg/l α-naphthaleneacetic acid and 1 mg/l zeatin began dividing after 3 days, and after 30 days this resulted in an absolute plating
efficiency as high as 2.5%. After 2 months of culture, 60% of the developed calli were highly friable and in appearance identical
to the original FEC. The protoplast derived FEC was first purified through two rounds of selection of 3 weeks each before
beeing cultured for regeneration of plants. This was done by culturing the protoplast-derived FEC for 11 weeks on maturation
medium, yielding a maximum of 184 organized embryos per 10.000 initially cultured protoplasts. Most of the organized embryos
were torpedo shaped and matured after they had been isolated from the calli and transferred to fresh medium. Mature embryos
were multiplied by secondary somatic embryogenesis at high efficiency (>90%) on a medium supplemented with 8 mg/l 2,4-dichlorophenoxyacetic
acid. About 30% of the mature secondary somatic embryos developed into shoots after transfer to a medium supplemented with
1 mg/l N6-benzylaminopurine (BAP). Shoots rooted readily on a medium without BAP.
Received: 30 August 1996 / Revision received: 9 June 1997 / Accepted: 1 October 1997 |
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Keywords: | Cassava Protoplast culture Friable embryogenic callus |
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