ISSN:
1573-5044
Keywords:
Arachis hypogaea
;
2,4-dichlorophenoxyacetic acid
;
naphthaleneacetic acid
;
somatic embryo morphology
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Somatic embryogenesis in peanut (Arachis hypogaea L.) using immature cotyledonary explants was induced on a wide range of 2,4-dichlorophenoxyacetic acid (2,4-D) (5 to 60mg l−1) and naphthaleneacetic acid (NAA) (20 to 50 mg l−1) levels. Percent embryogenesis ranged from 31 to 94%. As auxin level increased in induction medium, percent embryogenesis decreased and was associated with browning of explants. However, with higher 2,4-D induction levels (40 mg l−1 and over), embryogenic explants had dense masses of embryogenic areas and repetitive embryogenesis was enhanced. Higher auxin concentrations during induction decreased precocious germination of embryos, but had no marked effect on somatic embryo morphology. The use of 2,4-D compared to NAA in the induction medium resulted in greater per cent embryogenesis and mean number of embryos. Embryos induced on NAA were harder, less pliant, and less succulent; cultures exhibited more extensive root development and nonembryogenic callus proliferation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00046094
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