Abstract
Explants for tissue culture were derived from mesocotyl plate tissue of Echinocha crus-galli var. oryzicola and E. muricata seedlings germinated under anaerobic conditions. Callus was initiated in the dark under aerobic conditions on a modified Murashige and Skoog medium plus 10 or 5 mg/l 2,4-dichlorophenoxyacetic acid (2,4-D) and 2 mg/l of 6-benzyl-aminopurine (BAP). Transfer of this callus tissue into the light on MS medium containing low auxin (≤ 5 mg/l) readily resulted in the formation of green plantlets. Scanning electron microscopic observations revealed that regeneration occured through the formation of somatic embryros. Capacity for regeneration is maintained after repeated callus subculture. This regenerative capacity via somatic embyros provides a valuable research system for continuing the study of the metabolism and developmental physiology of Echinochloa.
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