
TY  - JOUR
A1  - Smith, MM 
A1  - O'brien, TP 
T1  - Distribution of Autofluorescence and Esterase and Peroxidase Activities in the Epidermis of Wheat Roots
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 1979
VL  - 6
IS  - 2
SP  - 201
EP  - 219
KW  - 
UR  - https://doi.org/10.1071/PP9790201 
N2  - In the wheat root, peroxidases and esterases specific for a-naphthyl esters of acetate, propionate and butyrate are concentrated in cell walls, particularly the outer wall of epidermal cells undergoing extension. In contrast esterases specific for &#946;-naphthyl esters of propionate and butyrate were intra- cellular and concentrated in epidermal and outer root-cap cells of the wheat root. Both &#945;-naphthyl and &#946;-naphthyl esters of longer-chain fatty acids proved to be poor substrates. The esterases and peroxidases associated with the outer epidermal wall may well be involved in turnover of phenolic acids cross-linked to polysaccharides. In this regard, ferulic acid and diferulate were shown to be constituents of wheat-root cell walls. The distribution of these substances can also be inferred from autofluorescence. Treatment with a commercial pig-liver esterase was without effect on the auto- fluorescence of the root cell-walls. Culture filtrates from Gaeumannomyces graminis did remove significant amounts of autofluorescent wall material. These preparations contained &#945;-naphthyl acetate esterase as well as many polysaccharide hydrolase activities. 
ER  -

