Article Figures & Data
Figures
- Figure 1
Fraxinus seedling with full wire girdle (below arrow) on the root at the beginning of the study.
- Figure 2
Longitudinal root sections of Fraxinus (F, left) and Populus (P, right), strained with acid fushsin, showing bridging over the wire (left side of both sections) and infolding prior to bridging (right side of both sections)
- Figure 3
Quantities of water transpired by Celtis and Fraxinus seedlings for each root wire girdling treatment. Bars within a species with similar letters are not significantly different at the 5% level (LS means). Mean values were calculated from data of four consecutive days, normalized by leaf area, and from two independent replications.
Tables
- Table 1.
Cross-sectional and conducting xylem element parameters for roots of Fraxinus pennsylvanica seedlings for each of the root wire girdling treatments.
Parameter No girdle Full girdle Partial girdle Cross-sectional surface area (μm2) 16306az ±881 y 16833a ±881 17683a ±1970 Number of functional vessels 671b ±78 574b ±78 1207a ±175 Xylem vessel diameter (μm)x 0.085a ±0.006 0.080a ±0.005 0.072a ±0.010 Total functional xylem area (μm2)w 58ab ±8 43b ±8 88a ±15 Conductive area (%)v 0.34a .29a .49a - Table 2.
Cross-sectional and conducting xylem element parameters for roots of Populus angulata x plantierensis whips for each of the root wire girdling treatments
Parameter No girdle Full girdle Partial girdle Cross-sectional surface area (μm2) 25556az +2152* 21132ab ±2152 15322b ±2152 Number of functional vessels 8206a ±507 4547b ±507 4895b ±594 Xylem vessel diameter (μm)x .293ab ±0.045 .360a ±0.045 .239b ±0.045 Total functional xylem area (μm2)w 2429a ±338 I642ab ±338 1110b ±396 Conductive area (%)v 9.4a 8.8a 8.0a - Table 3
Carbohydrate content of root tissue (mg/g dry wt) of Fraxinus pennsylvanica seedlings for each root wire girdling treatment.
NGZ FG PGG PGN Above Below Above Below Above Below Above Below Glucose in bark 147ay 139a 155a 152a 129a 138a 127a 122a Glucose in wood 108a 85a 131a 84a 96a 78a 80a 76a Starch in bark 156a 175a 139a 202a 176a 160a 152a 128a Starch in wood 141b 112b 106b 155ab 214a 125b 120b 98b - Table 4
Carbohydrate content of root tissue (mg/g dry wt) of Celtis occildentalis seedlings for each root wire girdling treatment
NGZ FG PGG PGN Above Below Above Below Above Below Above Below Glucose in bark 31by 32ab 95a 75ab 72ab 54ab 59ab 42ab Glucose in wood 57b 65b 125a 127a 73b 82ab 78ab 62b Starch in bark 56b 91a 89a 83ab 62ab 94a 72ab 81ab Starch in wood 182a 205a 156a 244a 153a 246a 176a 189a zNG = no girdle; FG = full girdle; PGG = partial girdle, girdle side of tissue; and PGN = partial girdle, splint side of tissue.
↵yvalues are the mean of five independent replications, mean separation in rows at the 5% level.
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