Micropropagation of sweet orange, Citrus sinensis Osbeck. for the development of nucellar seedlings
Das, A.; Paul, A.K.; Chaudhuri, S.
Indian Journal of Experimental Biology 38(3): 269-272
2000
ISSN/ISBN: 0019-5189 PMID: 10927871 Document Number: 518435
Protocol for micropropagation of elite plants of sweet orange (cv. Mosambi) through nucellar embryo culture has been standardized. Three to four nucellar embryos and a zygotic embryo could be excised from a single mature seed and successfully generated as healthy plants in basal MS medium. MS medium supplemented with NAA (1 mg/L) or 2,4-D (1 mg/L) promoted callus development in both nucellar and zygotic embryos. GA3 (1 mg/L) enriched medium induced plantlet initiation, but growth was very poor. No significant differences were observed between initial growth patterns of nucellar and zygotic seedlings developing from the same ovule. Five to six shoots were obtained from collar region of both category of embryos in MS medium supplemented with BAP (1 mg/L) within 60 days of inoculation. The number of plantlets were almost doubled after transfer in the same medium and culture for another 30 days. Higher doses of BAP resulted in initiation of callus directly from the embryos. The regenerated shoots (2-3 cm) could be rooted in MS medium supplemented with either NAA (0.75 mg/L) or NAA (0.5 mg/L) + IBA (2 mg/L). A number of plantlets could be obtained from a nucellar embryo grown shoot within a limited time period.