Fig.1

Set up for the measuring the potential and the transpiration rate in willow E:   electrode; R:   reference electrode; S:   stimulus 1. calomel electrode; 2. electrode trough; 3. cotton thread; 4. system for collecting plant physiology information; 5. willow seeding "

Fig.2

Variation potential (VP) transmitted through willow seedling without any treatment"

Fig.3

VP evoked by a local burn on the stem base can normally transmit ted through the ringing of the willow seedling"

Fig.4

VP evoked by a salt shock the on root of the willow seedling can normally transmit through the ring of the stem"

Fig.5

VP tranmitted through the xylem"

Fig.6

VP evoked by injury can not normally transmit through the stem without xylem A: VP evoked by a local burn on the stem base can not transmit up through the stem without xylem; B: VP evoked by a local burn on the shoot can not transmit down through the stem without xylemC: VP evoked by a salt shock on the shoot can not transmit down through the stem without xylem; D: VP evoked by a local burn on the willow root can not transmit up through the stem without xylem; "

Fig.7

The rate of the VP transmis sion decrease when the water supply from the cut surface was stopped"

Fig.8

VP transmission was inhibited when the water supply from the cut surface was stopped"