title: Isolation and culture of daylily mesophyll protoplasts.
abstract: Mesophyll protoplasts were isolated from leaf tissues of a diploid daylily (Hemerocallisx'Red Magic') by enzymatic digestion with a solution containing 0.5% Pectolyase Y-23, 0.1% Cellulase R-10, 0.1% Driselase, 0.6 M sorbitol and half-strength MS inorganic salts. When cultured on MS medium supplemented with 0.5 mg/l NAA and 0.5 mg/l BA, the protoplasts underwent sustained division to produce multicellular colonies. The optimal plating density for cell division was 0.5 × 10(5) protoplasts/ml. The highest plating efficiency was obtained in cultures grown in media solidified with 0.2% Gelrite. Under these conditions, formation of colonies occurred from 14% of cultured protoplasts. Calli were recovered from 9 colonies only after the cultures were treated with a conditioned medium. Intact plants were regenerated from protoplast-derived calli through organogenesis.
authors.affiliation: Cooperative Agricultural Research Program, Tennessee State University, 37209-1561, Nashville, TN, USA.
authors.forename: J T
authors.initials: JT
authors.lastname: Ling
authors.forename: R J
authors.initials: RJ
authors.lastname: Sauve