Causes of and Criteria for Immission Resistance in Spruce, Picea Abies (L.) Karst. IV. Recovery Power of the Needles, Relationships Between Forms of Resistance and Summary of Overall Results

摘要

Measurements of water potential in SO sub 2 treated Norway spruce showed that resistant clones recovered better than normal ones or at least showed less development of damage. Observation of needle discoloration gave only limited confirmation of this result. After fumigation, there was no relation of needle sulfur content and ability to recover. From a series of experiments on fumigation, it was concluded that reflexive and internal resistance were related. In a summary of the results of the series of four papers, the great importance of resistance to damaging materials is emphasized, and significant characteristics of resistant clones are indicated. There was also good evidence of a connection between pollution and drought resistance. (ERA citation 04:045457)