Mineral uptake and transport in xylem and phloem of the proteaceous tree, Banksia prionotes

Xylem sap of sinker (tap) root, cluster feeding roots, lateral roots and from an age series of main stem extensions of 6-year trees of Banksia prionotes was collected and analyzed for principal organic and inorganic solutes. During the phase of root uptake activity in winter and spring, cluster root...

Full description

Saved in:
Bibliographic Details
Published in:Plant and soil 1993-10, Vol.155 (1), p.273-276
Main Authors: Pate, J.S. (Western Australian Univ., Nedlands, WA (Australia). Dept. of Botany), Jeschke, W.D
Format: Article
Language:English
Subjects:
ABSORCION DE SUSTANCIAS NUTRITIVAS
ABSORPTION DE SUBSTANCES NUTRITIVES
BANKSIA
Chlorides
ESTACIONES DEL ANO
Excavations
FLOEMA
MINERALES
MINERALS
MINERAUX
NUTRIENT TRANSPORT
NUTRIENT UPTAKE
PHLOEM
PHLOEME
Phosphates
Plant roots
Potassium
SAISON
SEASONS
Solutes
TRANSPORT DES SUBSTANCES NUTRITIVES
TRANSPORTE DE NUTRIENTES
XILEMA
XYLEM
XYLEME
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Xylem sap of sinker (tap) root, cluster feeding roots, lateral roots and from an age series of main stem extensions of 6-year trees of Banksia prionotes was collected and analyzed for principal organic and inorganic solutes. During the phase of root uptake activity in winter and spring, cluster roots were principal xylem donors of malate, phosphate, chloride, sodium, potassium and amino acid N whereas other parts of the root served as major sources to the shoot of other cations, nitrate and sulphate. Sinker root xylem sap was at all times less concentrated in solutes than that of lateral roots into which cluster roots were voiding exported solutes. Phosphate was abstracted from xylem by stem tissue during winter and it and a range of other solutes released back to xylem immediately prior to extension growth of the shoot in summer. Phloem sap collected from mid regions of stems was unusually low in potassium and phosphate relative to chloride and sulphate in comparison with phloem sap of other species, and its low potassium: sodium ratio relative to xylem indicated poor discrimination against sodium during phloem loading. Data are discussed in relation to the asynchronous seasonal cycles of nutrient uptake and shoot growth.
ISSN:0032-079X
1573-5036
DOI:10.1007/bf00025035