Abstract
Immature zygotic embryo cultures of neem yielded highly regenerative cultures, with the response varying with the embryo stage at culture. Early dicotyledonous stage embryos were the most responsive followed by torpedo stage embryos. The embryo cultures differentiated three types of regenerants: somatic embryos (SEs), shoot buds and neomorphs. SEs exhibited morphological abnormalities such as pluricotyledony, fusion of cotyledons and absence of cotyledons. Although these SEs showed secondary embryogenesis, the occurrence of normal dicotyledonous embryos was extremely rare. On MS basal medium 3% of SEs developed a long tap root but a plumular shoot did not appear. However, it was possible to regenerate plantlets from immature zygotic embryo cultures of neem via neomorph formation and adventitious shoot bud formation. The transplantation survival of these plants was more than 80%.
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Abbreviations
- BAP :
-
6-Benzylamino purine
- CH :
-
Casein hydrolysate
- 2,4-D :
-
2,4-Dichlorophenoxyacetic acid
- GA 3 :
-
Gibberellic acid
- IAA :
-
Indole-3-acetic acid
- IBA :
-
Indole-3-butyric acid
- NAA :
-
α-Naphthaleneacetic acid
- SE :
-
Somatic embryo
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Acknowledgements
Rakhi Chaturvedi thanks Professor S.P. Bhatnagar for his critical analysis of the manuscript and the Council for Scientific and Industrial Research (CSIR), India, for financial assistance.
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Communicated by W. Harwood
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Chaturvedi, R., Razdan, M.K. & Bhojwani, S.S. In vitro morphogenesis in zygotic embryo cultures of neem (Azadirachta indica A. Juss.). Plant Cell Rep 22, 801–809 (2004). https://doi.org/10.1007/s00299-004-0768-0
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DOI: https://doi.org/10.1007/s00299-004-0768-0