New Zealand Journal of Botany abstracts

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Sugar content of xylem sap and susceptibility of willow to Chondrostereum purpureum

SANDRA D. STANISLAWEK*
P. G. LONG
L. K. DAVIS

Department of Plant Health
Massey University, Palmerston North
New Zealand

Abstract There was seasonal variation in the sugar concentration in xylem sap extracted from Salix fragilis at monthly intervals. Sucrose was the predominant sugar and showed the greatest variation in concentration over the study period. The dry weight of fungal mycelium obtained from growth in sap extracted at monthly intervals was significantly correlated with sucrose concentration. Growth of the fungus in xylem tissue however, was not correlated with the sugar content of extracted sap. There was little difference in growth of Chondrostereum purpureum in inoculated excised twigs incubated in the field and inoculated twigs in situ. Growth was greater in corresponding batches of twigs incubated in the laboratory. The role of temperature and sap constituents in the determination of the susceptibility of trees to C. purpureum is discussed.

Keywords Chondrostereum purpureum; plant physiology; silver leaf disease; willow; xylem sugars

Received 3 April 1986; accepted 3 July 1986
New Zealand Journal of Botany, 1987, Vol. 25 : 263-269
0028-825X/87/2502-0263$2.50/0 © Crown copyright 1987

PDF file of entire paper: medium quality (493K); (scanned from paper original: notes about this process)

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