Assessment of polysomaty, embryo formation and regeneration in liquid media for various species of diploid annual Medicago

被引:22
作者
Iantcheva, A
Vlahova, M
Trinh, TH
Brown, SC
Slater, A
Elliot, MC
Atanassov, A [1 ]
机构
[1] Norman Borlaug Inst Plant Sci Res, Inst Genet Engn, Kostinbrod 2232, Bulgaria
[2] Inst Genet Engn, Kostinbrod 2232, Bulgaria
[3] CNRS, Inst Sci Vegetales, UPR 40, F-91198 Gif Sur Yvette, France
[4] De Montfort Univ, Norman Borlaug Inst Plant Sci Res, Leicester LE7 9SU, Leics, England
关键词
annual medics; direct somatic embryogenesis; regeneration;
D O I
10.1016/S0168-9452(00)00432-5
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
To avoid polyploidy in regenerants the source of explant material should be monosomatic. Therefore, the leaf and petiole tissue of five diploid Medicago species (Medicago ciliaris, Medicago murex, Medicago orbicularis, Medicago polymorpha and Medicago tnuncatula cv. Jemalong, and the ecotype R108-1) was assessed for polysomaty by flow cytometry. For the species studied the frequency of 2C nuclei was about 90% in leaves compared with that in petioles. Embryos were readily formed from tissue of leaves in liquid media containing 1 mg 1(-1) or 4 mg 1(-1) dichlorophenoxyacetic acid (2,4-D). For embryo development two procedures were tested - prolonged use of induction medium and treatment with polyethylene glycol Mw 6000 (PEG). The highly regenerable genotypes M, truncatula cv. Jemalong and R108-1 showed efficient conversion of embryos after maturation in liquid medium. The regenerated plants were diploid and with normal phenotype. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.
引用
收藏
页码:621 / 627
页数:7
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