. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NPA UPPER SIDE OF COLUMELLA. 12 16 20 24 Time after qravistmJation (min) Figure 6. Effect of auxin-transport inhibitors on current density. Bars indicate standard deviation. Positive current values indicate outward current. Redrawn with permission from Bjorkman and Leopold (1987b). differential growth to begin = 30 min in these roots) are probably associated with growth and cannot be attrib- uted to perception with confidence. The response should also be associated with the tissue from which it origi- the present experim
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NPA UPPER SIDE OF COLUMELLA. 12 16 20 24 Time after qravistmJation (min) Figure 6. Effect of auxin-transport inhibitors on current density. Bars indicate standard deviation. Positive current values indicate outward current. Redrawn with permission from Bjorkman and Leopold (1987b). differential growth to begin = 30 min in these roots) are probably associated with growth and cannot be attrib- uted to perception with confidence. The response should also be associated with the tissue from which it origi- the present experiment, an insensitive part of cap) was used to measure non-specific gating zone for growth-related re- sponse esponses adjacent to the gravi- perceptiv s there were nine combina- tions of ti one of which fulfilled the criteria for a iated with graviperception; only this com!: a recognizable signal. To be a ust . the response must be consistent. On tin. ,l cap, the current change was of a repe; , ^A cm~2 out- ward) with a repeatable rise time (3 min). On the lower side, the current did change, but not in a repeatable and recognizable manner. Therefore, only the current change on the upper side could be applied as a measure of graviper- ception. The response also occurs after artifacts due to turn- ing have subsided. This technique will not work in tissues where the response is expected in under 1 min, , Lepi- cliitm at 7 s (Behrens el al, 1982) because the biological response would not be distinguished from artifacts of turn- ing and because it would be difficult or impossible to realign the root with the probe and to get a stable reading before the biological response commenced. This technique has been applied to test hypotheses about the physiology of graviperception which has not before been Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustratio
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
