Racines

Amaryllidaceae

Les racines

(en construction)

Structure :

Racines secondaires
Les racines sont épaisses, charnues et peu ramifiées. Elles sont généralement persistantes tout au long du cycle, y compris durant la période de repos, à l’exception de quelques genres du pourtour méditerranéen (Narcissus, Galanthus...).
Ex. : Crinum sp. www.botgard.ucla.edu/html/botanytextbooks/generalbotany/typesofroots/b0740tx.html

Fonctions :

Absorption
Réserve
Les racines sont contractiles et permettent au jeune bulbe issu de semi, ou au bulbe dérangé, de s'enfoncer au fil des ans dans le sol jusqu'à une profondeur propre à l'espèce.

Mycorrhizes :

Narcissus

Zephyranthes

Hippeastrum

Bibliographie :
Mycorrhize

Chilvers, M. T. & M. F. J. Daft. 1981. Mycorrhizas of the Liliiflorae. II. Mycorrhiza Formation and Incidence of Root Hairs in Field Grown Narcissus L., Tulipa L. and Crocus L. Cultivars. New Phytologist, 89(2): 247-261.
Iqbal, S.H. & Firdaus-e-Bareen. 1986. Mycorrhizae of the Liliflorae. II. Vesicular arbuscular mycorrhizal infections in foliar green leaves of Narcissus poeticus L. Biologia, 32: 363-369.
Iqbal, S.H. & Firdaus-e-Bareen. 1986. Mycorrhizae of the Liliflorae. III. Morphogenesis of underground parts of field grown Narcissus poeticus L., in relation to vesicular arbuscular mycorrhizal infections. Biologia, 32: 371-382.
Firdaus-e-Bareen & Ahmad, T. 1991. Mycorrhizae of the Liliflorae: V. Preferential association of Endogonaceous spores with scales on bulbs of Zephyranthes citrina . Science International, 3: 75-78.
Firdaus-e-Bareen & Ahmad, T. 1992. Survival of VAM endophytes colonizing scales of Zephyranthus citrina under different conditions of storage. Science International, 4: 195-198.
Fontenla S., Puntieri J., Ocampo J.A. 2001. Mycorrhizal associations in the Patagonian steppe, Argentina. Plant and Soil, 233(1): 13-29.
Scagel, Carolyn. 2003. Soil pasteurization and inoculation with Glomus intraradices alters flower production and bulb composition of Zephyranthes spp. Journal of Horticultural Science and Biotechnology*, 78(6): 798-812. [abstract] [www.ars.usda.gov/SP2UserFiles/person/4947/PDFs/Scagel1st/Scagel2003ZephyrJHSB.pdf]
Bohner A., Grims F., Sobotik M. 2004. Narcissus radiiflorus-community in the area of the Styrian Salzkammergut (Styria, Austria) - ecology, sociology and nature protection. Tuexenia, 24: 247-264.

Divers

Schreiber L. 1996. The chemical composition of the Casparian band of Clivia miniata roots: evidence of lignin. Planta 199: 596-601.
Zeier, J., & Schreiber, L. 1997. Chemical composition of hypodermal and endodermal cell walls and xylem vessels isolated from Clivia miniata Reg. roots: identification of the biopolymers lignin and suberin. Plant Physiology, 113: 1223-1231.
Casado, C.G., A. Heredia. 1998. Water permeability of hypodermis isolated from Clivia miniata roots. Zeitschrift Fur Naturforschung 53c(11/12): 1096-1099.
Zeier, J., L. Schreiber. 1999. Fourier transform infrared-spectroscopic characterisation of isolated endodermal cell walls from plant roots: chemical nature in relation to anatomical development. Planta 209(4): 537-542. [abstract] (Clivia miniata)