SOMATIC EMBRYOGENESIS AND PLANT REGENERATION INDUCED FROM MATURE SEEDS, COTYLEDONS AND SHOOT TIPS OF CUCUMBER. | ||||
Journal of Productivity and Development | ||||
Article 3, Volume 17, Issue 2, April 2012, Page 193-209 PDF (436.65 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/jpd.2012.42464 | ||||
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Authors | ||||
Yehia Khidr 1; El-Sayed El-Absawy2; Amal Mahmoud1; Mohamed Hasan2; Alaa Hemeida2 | ||||
1Department of Plant Biotechnology, Genetic Engineering and Biotechnology Research Institute, Sadat City, Menofia University | ||||
2Department of Bioinformatics, Genetic Engineering and Biotechnology Research Institute, Sadat City, Menofia University | ||||
Abstract | ||||
Commercial cucumber cultivars were explored for embryogenesis and plant regeneration induced in somatic tissues on plant growth regulators. An efficient in vitro regeneration protocol for Cucumis sativus L via somatic embryogenesis has been developed. Embryogenic callus cultures were established from mature seeds, cotyledons and shoot tips on Murashige and Skoog (MS) medium containing 87.64 µM sucrose, 0.8% agar, 2,4-dichlorophenoxyacetic acid 2,4-D and kinetin. Maximum callus induction (94%, 92%) was observed in cotyledons and mature seeds on MS medium supplemented with 1mg/L 2,4-D, respectively. Somatic embryos were observed on mature seed explants after 17 weeks on MS medium supplemented with 5mg/L2,4-D (33%) and 0.5mg/L α-naphthaleneacetic acid(NAA) (27%). while somatic embryos were observed on cotyledon explants after 18 weeks on MS medium supplemented with 2mg/L 2,4-D (10%) and 0.5mg/L NAA (25%). The highest percentage of somatic embryogenesis (40%) was obtained with 2 mg/L 2,4-D and 0.5 mg/L NAA (30%) on shoot tip explants after 13 weeks. Regeneration of adventitious buds from callus of cotyledon and mature seeds were achieved after 8 weeks on MS medium supplemented with 0.5mg/L and 1mg/L 6-benzyladenine(BA), respectively. In vitro-regenerated plantlets with well-developed roots were successfully hardened in a greenhouse and established in soil. Generally, auxin was found critical for induction of callus and formation of somatic embryos, while the cytokinin was essential for callus differentiation and plant regeneration. | ||||
Keywords | ||||
Cucumber; Cytokinin; somatic embryogenesis; cotyledon, callus, Cucumis sativus L., shoot tip | ||||
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