Abstract
The effects of the antibiotics methotrexate and chloramphenicol on somatic embryogenesis inCitrus were evaluated. Relatively low levels (0.1 to 1.0 μg/ml) of these antibiotics did not inhibit embryo production from undeveloped ovules of ‘Key’ lime [C. aurantifolia) (Christm.) Swing.]. Surprisingly, both antibiotics induced the formation of embryogenic callus in these cultures. This is usually a rare event in cultures of undevelopedCitrus ovules, and ‘Key’ lime is especially recalcitrant. The effects of these antibiotics on embryogenic callus appeared to be limited to the induction stage, because there was no consistent effect, either stimulatory or inhibitory, on established, lines of embryogenic callus.
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