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Pathways of assimilation and transfer of fixed nitrogen in coralloid roots of cycad-Nostoc symbioses by J. S. Pate; P. Lindblad; C. A. Atkins is a Agricultural and Biological Sciences article available to read on EtoBox.

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Freshly detached coralloid roots of several cycad species were found to bleed spontaneously from xylem, permitting identification of products of nitrogen transfer from symbiotic organ to host. Structural features relevant to the export of fixed N were described for Macrozamia riedlei (Fisch. ex Gaud.) Gardn. the principal species studied. Citrulline (Cit), glutamine (Gin) and glutamic acid (Glu), the latter usually in a lesser amount, were the principal translocated solutes in Macrozamia (5 spp.), Encephalartos (4 spp.) and Lepidozamia (1 sp.), while Gin and a smaller amount of Glu, but no Cit were present in xylem sap of Bowenia (1 sp.) and Cycas (2 spp.). Time-course studies of 15N enrichment of the different tissue zones and the xylem sap of 15Nz-pulse-fed coralloid roots of M. riedlei showed earlier 15N incorporation into Gin than into Cit, and a subsequent net decline in the 15N of Gin of the coralloid-root tissues, whereas Cit labeling continued to increase in inner cortex and stele and in the xylem sap. Hydrolysis of the 15N\_labele d Cit and Gin consistently demonstrated much more intense labeling of the respective carbamyl and amide groups than of the other N-atoms. Corall

Who reads Pathways of assimilation and transfer of fixed nitrogen in coralloid roots of cycad-Nostoc symbioses?

Author

J. S. Pate; P. Lindblad; C. A. Atkins

Publisher

Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0032-0935)

Published

1988

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)