title: Plant regeneration through protocorm-like bodies induced from rhizoids using leaf explants of Rosa spp.
abstract: A new protocol for plant regeneration via protocorm-like bodies (PLBs) induced from rhizoids that developed from leaf explants of Rosa spp. (R. canina L., R. multiflora var. cathayensis Rehd. et Wils., and R. multiflora f. carnea Thory.) has been established. Rhizoids were induced from calli of leaf explants incubated under dark conditions on Murashige and Skoog (MS) medium containing 1.5 mg/l 2, 4-D. PLBs developed from the tip of rhizoids cultured under light conditions on (1/2) MS medium containing 20 mg/l TDZ. About 90, 17 and 93% of rhizoid formation were achieved for the above-mentioned Rosa spp., respectively using this protocol. The frequency of PLB clusters formation and the number of PLB clusters per explant reached 50% and 5.1 for R. canina, 46.7% and 0.8 for R. multifolra var. cathayensis, 46.7% and 4.2 for R. multiflora f. carnea, respectively. PLB clusters regenerated on MS medium supplemented with 2 mg/l 6-BA, 0.1 mg/l IBA, and 0.1 mg/l GA(3). The best result of regenerated plantlets per leaf explant achieved via PLBs for the three Rosa spp. mentioned above was 3.6, 0.1, and 1.2, respectively. Environmental scanning electron microscope and histological studies revealed that rhizoids were structurally different from roots grown in vitro, and PLBs developed from proembryos.
authors.affiliation: Department of Ornamental Horticulture and Landscape Architecture, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, 100094 Beijing, People's Republic of China.
authors.forename: Chuanwei
authors.initials: C
authors.lastname: Tian
authors.forename: Ying
authors.initials: Y
authors.lastname: Chen
authors.forename: Xiaolan
authors.initials: X
authors.lastname: Zhao
authors.forename: Liangjun
authors.initials: L
authors.lastname: Zhao
mesh_terms: D003470:Culture Media / Q000494:pharmacology; D008854:Microscopy, Electron; D018515:Plant Leaves / Q000187:drug effects / Q000502:physiology* / Q000648:ultrastructure; D018520:Plant Shoots / Q000187:drug effects / Q000502:physiology* / Q000648:ultrastructure; D012038:Regeneration / Q000187:drug effects / Q000502:physiology*; D027826:Rosa / Q000187:drug effects / Q000502:physiology* / Q000648:ultrastructure; D046509:Tissue Culture Techniques
chemical_list: D003470:Culture Media