Summary
A discussion of a suitable procedure to rapidly propagate free-living date palms (Phoenix dactylifera L.) from callus cultures is presented. Embryogenic callus derived from lateral bud explants was subjected to various auxin treatments in liquid and agar media including p-chlorophenoxyacetic acid. α-naphthaleneacetic acid or 2,4-dichlorophenoxyacetic acid at 0.0, 0.1, 1.0 and 10.0 mg/l concentrations in order to obtain optimum growth. Subsequent plantlet initiation from callus was found to be related to initial auxin pretreatments upon subculture to medium devoid of hormones. Plantlet production from callus subcultured from media containing 0.0, 1.0 and 10.0 mg/l auxin concentrations was notably lower than from callus precultured on the 0.1 mg/l auxin levels. In order to improve in vitro adventitious rooting isolated plantlets were cultured on media containing 0.0, 0.1, 1.0 and 10.0 mg/l concentrations of indole-3-acetic acid or α-naphthaleneacetic acid in various physical environments. Optimum adventitious rooting responses and survival in free-living conditions were obtained by culturing plantlets in medium containing 0.1 mg/l for 8–16 weeks prior to transplanting to soil. Axillary shoot outgrowths (offshoots) were found to be common in plantlets cultured on a variety of media once an adequate root-shoot system was developed. Mention of a trademark name or proprietary product does not constitute a guarantee or warranty of the product by the US. Department of Agriculture and does not imply its approval to the exclusion of other products that may be suitable.
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Tisserat, B. Factors involved in the production of plantlets from date palm callus cultures. Euphytica 31, 201–214 (1982). https://doi.org/10.1007/BF00028323
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DOI: https://doi.org/10.1007/BF00028323