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Fine structure of and embryoid development from embryogenic ovular callus of 'shamouti' orange (Citrus sinensis osb.)
Year:
1974
Source of publication :
Journal of Experimental Botany
Authors :
באטן, ג'יימס
;
.
כוכבא, יהושע
;
.
Volume :
25
Co-Authors:
Button, J., Plant Tissue Culture Research Unit, Department of Botany, University of Natal, Pietermaritzburg, South Africa
Kochba, J., Plant Tissue Culture Research Unit, Department of Botany, University of Natal, Pietermaritzburg, South Africa
Bornman, C.H., Plant Tissue Culture Research Unit, Department of Botany, University of Natal, Pietermaritzburg, South Africa
Facilitators :
From page:
446
To page:
457
(
Total pages:
12
)
Abstract:
A morphologically, anatomically and physiologically unique callus has been developed from unfertilized ovules of Shamouti orange. The callus, which is suspected to be of nueellar origin, is not made up of the normal unorganized parenchymatous tissue, but solely of numerous proembryoids which vary between 0.1 and 1.0 mm in diameter. Adventive embryogenesis in this tissue is autonomous and is in fact depressed by the inclusion of growth regulators in the medium, despite having been in culture for more than 2 years.Embryogenesis occurs in single cells on the periphery and within existing proembryoids. Cells destined to form new proembryoids are surrounded by greatly thickened cell walls which lack plasmodesmata. Cell divisions occur within the thickened walls to give rise to globular proembryoids which are freed from encasing thick walls as these degenerate.Proembryoids may enlarge into spherical pseudobulbils up to 4 mm in diameter with an epidermal cell layer but no vascularization. Such structures rarely develop into plantlets but do form further proembryoids from surface cells. Alternatively, proembryoids may develop into heart-shaped, torpedo, and cotyledonary embryoids, and thence into plantlets with varying degrees of organ fasciation.Since plantlets are derived from single, usually surface cells, this system holds great promise for the production of solid genetic mutants by irradiation. © 1974 Oxford University Press.
Note:
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DOI :
10.1093/jxb/25.2.446
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
31025
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:59
Scientific Publication
Fine structure of and embryoid development from embryogenic ovular callus of 'shamouti' orange (Citrus sinensis osb.)
25
Button, J., Plant Tissue Culture Research Unit, Department of Botany, University of Natal, Pietermaritzburg, South Africa
Kochba, J., Plant Tissue Culture Research Unit, Department of Botany, University of Natal, Pietermaritzburg, South Africa
Bornman, C.H., Plant Tissue Culture Research Unit, Department of Botany, University of Natal, Pietermaritzburg, South Africa
Fine structure of and embryoid development from embryogenic ovular callus of 'shamouti' orange (Citrus sinensis osb.)
A morphologically, anatomically and physiologically unique callus has been developed from unfertilized ovules of Shamouti orange. The callus, which is suspected to be of nueellar origin, is not made up of the normal unorganized parenchymatous tissue, but solely of numerous proembryoids which vary between 0.1 and 1.0 mm in diameter. Adventive embryogenesis in this tissue is autonomous and is in fact depressed by the inclusion of growth regulators in the medium, despite having been in culture for more than 2 years.Embryogenesis occurs in single cells on the periphery and within existing proembryoids. Cells destined to form new proembryoids are surrounded by greatly thickened cell walls which lack plasmodesmata. Cell divisions occur within the thickened walls to give rise to globular proembryoids which are freed from encasing thick walls as these degenerate.Proembryoids may enlarge into spherical pseudobulbils up to 4 mm in diameter with an epidermal cell layer but no vascularization. Such structures rarely develop into plantlets but do form further proembryoids from surface cells. Alternatively, proembryoids may develop into heart-shaped, torpedo, and cotyledonary embryoids, and thence into plantlets with varying degrees of organ fasciation.Since plantlets are derived from single, usually surface cells, this system holds great promise for the production of solid genetic mutants by irradiation. © 1974 Oxford University Press.
Scientific Publication
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