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Studies of cotyledon protoplast cultures from B napus,B. campestris and B. oleracea. II: Callus formation and plant regeneration
Authors:Kong-Nan Zhao  Dennis J. Bittisnich  Gerald M. Halloran  Malcolm I. Whitecross
Affiliation:(1) Division of Botany and Zoology, School of Life Sciences, The Australian National University, 0200 Canberra, ACT, Australia;(2) Co-operative Research Centre for plant Science, The Australian National University, 0200 Canberra, ACT, Australia;(3) Plant and Soil Sciences Section, School of Agriculture and Forestry, The University of Melbourne, 3052 Parkville, Victoria, Australia;(4) Present address: Department of Plant Biology, College of Biological Science, University of Minnesota, 220 Biological Science Centre, 1445 Gortner Avenue, 55108-1095 St. Paul, MN, USA
Abstract:Cotyledons from twelve cultivars of Brassica; B. napus (Westar, Eureka, Global, Pivot and Narc 82); B. campestris: (Arlo, Sonja, Bunyip and Wonk Bok) and B. oleracea (Phenomenal Early, Sugar Loaf and Earliball) were used for protoplast isolation and culture in a comparative study of cell colony and callus formation, and plant regeneration. The formation of cell colonies and callus from protoplast cultures were significantly influenced by the light conditions of seed germination. All twelve cultivars showed callus formation from protoplast cultures derived from cotyledons of seedlings grown in dark for 3 days followed by 1 day dim light (dark/dim light-grown). Callus was obtained in all five liquid media used: modified K8P(1), modified K8P(2), modified MS, modified B and modified NN. In contrast, only six cultivars exhibited callus formation from the protoplasts isolated from cotyledons of seedlings germinated under light conditions for 7 days (light-grown) and in only three media: modified K8P(1), modified MS, modified B.Callus, derived from protoplast cultures isolated from dark/dim light-grown cotyledons and grown on K3 or MS series solid media for about 1 month, could develop shoots when further transferred onto MS series regeneration media. All five cultivars of B. napus, three of the four cultivars of B. campestris (Arlo, Sonja and Bunyip) and one of the three cultivars of B. oleracea (Sugar Loaf) exhibited shoot regeneration from protoplast cultures within 2–3 months after protoplast isolation. The frequency of shoot regeneration ranged among 1–22.5%. A high degree of reproducibility was observed in cultivars Westar, Eureka, Global, Arlo, Bunyip and Sugar Loaf. In contrast, among the six cultivars that formed callus in protoplast culture derived from light-grown cotyledons, only three cultivars from B. napus (Westar, Eureka, Global) exhibited shoot regeneration 5.5 months after protoplast isolation. Regenerated shoots from cultivars Westar, Eureka and Bunyip and Sugar Loaf, which derived from protoplasts of dark/dim light germinated seedling and were induced to root on rooting media, survived in soil and grew to produce silique and set seeds.Abbreviations 2,4-d 2,4-dichlorophenoxyacetic acid - BA benzylaminopurine - EDTA ethylenediaminetetraacetic acid - IAA indole-3-acetic acid - IBA indole-3-butyric acid - KT kinetin - GA3 gibberellic acid - MS Murashige and Skoog medium - NAA agr-naphthaleneacetic acid - PAR photosynthetically active radiation
Keywords:Brassica napus  B. campestris  B. oleracea  cotyledon protoplasts  callus formation and growth  plant regeneration
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