Synchronized shoot regeneration of rice (Oryza sativa L.) calli on solid medium by adjustment of intracellular 2,4-dichlorophenoxyacetic acid concentration View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1999-03

AUTHORS

M. Morita, X.-H. Xing, H. Unno

ABSTRACT

The present research aimed to establish conditions for synchronized plantlet regeneration from rice callus based on a quantitative analysis of the relationship between intracellular 2,4-dichlorophenoxyacetic acid (2,4-D) concentration and shoot regeneration rate. To prepare the rice calli with different intracellular 2,4-D concentrations prior to regeneration, callus precultures were carried out in medium containing 4 mg/l 2,4-D and in 2,4-D-free medium for predetermined periods. As the critical intracellular 2,4-D concentration of the calli precultured in 2,4-D-free medium was too low to analyze precisely by conventional analytical methods, it was estimated using a kinetic model which described the behavior of 2,4-D by taking its uptake, metabolism and/or inactivation rates during the callus preculture into consideration. An experimental relationship between intracellular 2,4-D concentration and regeneration rate of rice calli revealed that the intracellular 2,4-D concentration should be controlled as low as 2.6×10–2μg/g fresh weight to reach the same synchronization in shoot regeneration as seen with rice seed germination. This condition was realized by feeding sugar into the 2,4-D-free medium after 4 days preculture when the carbon source was exhausted. More... »

PAGES

633-639

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s002990050634

DOI

http://dx.doi.org/10.1007/s002990050634

DIMENSIONS

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