IN VITRO DIRECT PLANT REGENERATION OF Calendula officinalis L.

Document Type : Original Article

Author

Minufiya University -- Genetic Engineering and Biotechnology Research Institute. Plant Biotechnology Department, Egypt.

Abstract

Regenerating of whole plants of Calendula otticicnslis, L. was achieved
through direct organogenesis using leaf and cotyledonary nodes as explants. Leaves
were taken from 3·week-old in vitro plantlets and cultured on MS basal medium
supplemented with 200 mg/L glutamine and 500 mgl L casein hydrolisate. The
medium contained SA with different auxins (2,4-0 and NAA) Prolific direct
adventitious shoot regeneration occurred on most of the tested media which that
contained either 2.4-0 or NAA. The best response in terms of frequency of shoot
regeneration (86.64%), number of shoots per explant (7.60) and bud forming capacity
(6.58) were obtained with 1.0 mg/L 2,4-0 alone. Cotyledonary node explants were
cultured on MS medium,supplemented with various concentrations of Kin and NAA.
The highest frequency of regenerated shoots was achieved on MS medium
supplemented with 2.0 mg/L Kin and 1.0mg/L NAA (9.20). Regenerated shoots were
excised and rooted, the highest number of root/shoot was obtained with half strength
MS salt medium supplemented with 1.0 mg/L ISA In vitro rooted plantlets were
finally transferred to mixture of peatmoss and vermiculite al equal volume w·th
survival rate95% after 21 days.
Abbreviations: MS- Murashige and Skoog; 2,4-D - diChlorophenoxyacetic acid;
BA-Benzyladenine ; NAA- a-naphthalene acetic acid; IBA- indole-3-
butyric acid; Kin-Kinetin, BFC; Sud Forming Capacity

Keywords