Canadian Forest Service Publications
Effect of water stress on the rate of non-suberized impervious tissue formation following wounding in Abies grandis. 1975. Puritch, G.S.; Mullick, D.B. Journal of Experimental Botany 26(6): 903-910.
Issued by: Pacific Forestry Centre
Catalog ID: 1592
Available from the Journal's Web site. †
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The formation of non-suberized impervious tissue (NIT) at injuries, regardless of the cause, is an integral part of the process of periderm formation. Interference with this process is associated with susceptibility to insect and fungal pathogens. To understand how disease agents interfere with the process, it is necessary to know how the process is affected by environmental factors. This paper shows that water stress greatly retards the rate of NIT formation after mschanical wounding.
Different levels of water stress were obtained by watering Abies, seedlings after the required stress had been reached, according to the amount of water lost by transpiration and by monitoring water potential with a pressure chamber. Rates of NIT formation in well watered plants, at about 0.5 MPa stress, were similar to those subjected to 1.5 MPa3 of stress. At water stresses greater than l.5 MPa, NIT formation was delayed; for example, in one experiment it formed at 17 d in 1.5 MPa-stressed seedlings, 29 d in 2.0 MPa seedlings and 49 d in 3.0 MPa seedlings. The stress symptoms were alleviated on rewatering with the resumption of the normal rate of NIT development. The significance of the findings in susceptible responses to insects and fungi is discussed.