Article Figures & Data
Figures
- Figure 1.
Predicted relative drought avoidance of desert willow (W), fruitless mulberry (M), and yellow bells (B) as influenced by irrigation level (L, M, H = low, moderate, and high irrigation levels, respectively. Lines representing low, moderate, and high irrigation levels for desert willow are present but indistinguishable).
- Figure 2.
Predicted drought tolerance of desert willow (W), fruitless mulberry (M), and yellow bells (B).
Tables
- Table 1.
Reduced regression equations and predicted relative drought avoidance of desert willow, fruitless mulberry, and yellow bells at -10 and -100 MPa atmospheric water potential
Species Irrigation level Regression equationsz Drought avoidanceV -10MPa -100 MPa Desert willow Low Y =-63.8 +81.7 X abc 18± 16 100± 12 Moderate Y =-52.5 + 76.0 X abc 23± 16 99± 12 High Y =-76.0 + 87.3X abc 11 ± 16 99± 12 Fruitless mulberry Low Y=-82.5± 100.3 c 18± 12 118 ± 12 Moderate Y =-78.8 ± 95.6 X c 17± 12 112 ± 12 High Y=-67.7±86.8X be 19± 13 106± 12 Yellow bells Low Y =-69.0 + 89.9X abc 13+17 95± 13 Moderate Y =-47.4 ± 65.7X ab 18± 17 84± 13 High Y =-38.3 ± 58.6X a 20± 17 79± 14 ↵z Y = drought avoidance, X = LOG(-atmospheric water potential). Regression equations followed by the same letter are not significantly different at p=.O5 as determined by multiple linear regression with indicator variables for species and irrigation level
y Predicted drought avoidance ± 95% confidence interval at -10 and -100 MPa atmospheric water potential.
- Table 2.
Reduced regression equations and predicted drought tolerance of desert willow, fruitless mulberry, and yellow bells.
Species Regression equationsz Drought tolerancey (MPa) Desert willow Y = 198 X-0.73 a -7.7 ± 1.8 Fruitless bulberry Y = 131 X-0.68 b -4.8 ± 1.9 Yellow bells Y = 188 X-0.74a -6.9 ± 1.8 ↵z Y = sin-1 (% cell survival/100)1/2, X = - atmospheric water potential. Regression equations followed by the same letter are not significantly different at p=.05 as determined by multiple linear regression with indicator variables for species and irrigation level.
↵y Predicted drought tolerance ± 95% confidence interaval.
- Table 3.
Relative drought resistance of desert willow, fruitless mulberry, and yellow bells at -10 and -100 MPa atmospheric water potential.
Species Irrigation level Drought resistance (MPa) -10 MPa -100 MPa Desert willow Low -138 -769 Moderate -181 -768 High -87 -762 Fruitless mulberry Low -85 -566 Moderate -81 -539 High -92 -508 Yellow bells Low -90 -659 Moderate -127 -583 High -141 -548 - Table 4.
Irrigation level influence on rate of water loss detected leaves of desert willow, fruitless mulberry, and yellow bells.
Irrigation level Water loss (mg/g dry weight/min) sert willow Fruitless mulberry Yellow bells Low 1.1a 4.4ab 6.8bc Moderate 4.0ab 4.7b 9.1c High 4.4ab 4.9b 13.8d Mean separation by Waller-Duncan LSD (7,8) at k=100(p=.05).
- Table 5.
Morphological characteristics of desert willow, fruitless mulberry, and yellow bells leaves.
Species Area (mm2) Volume (mm3) Average thickness (mm) Non-gas density (mg/mm2) Non-gas volume(%) Desert willow 341a 119a 0.34a 1.28b 86.1a Fruitless mulberry 9275b 2622b 0.29a 0.99a 93.0b Yellow bells 1122a 291a 0.26a 1.25b 87.1a Mean separation within columns by Waller-Duncan LSD (7,8) at k=100 (p=.05).
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