Flood-Tolerance Ranking of Red and Freeman Maple Cultivars

Louis B. Anella; Thomas H. Whitlow

doi:10.48044/jauf.1999.005

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Figure 1.
Net photosynthesis of flooded red and Freeman maple cultivars. Trees were flooded on day 0, after gas exchange measurements were taken, and remained flooded for 45 days. James River trees were included in the study as an indicator of flood tolerance but were not included in the statistical analysis. Results are presented as the average for high (significantly greater than intermediate or low at P = 0.05), intermediate, and low (significantly less than high or intermediate at P = 0.10) flood tolerance rankings. High = Schlesinger, Red Sunset, and ‘Bowhall; Intermediate = ‘Armstrong’, ‘Morgan’, ‘October Glory’, Scarlet Sentinel, and ‘Autumn Blaze’; Low = ‘Karpick’, ‘Autumn Flame’, and ‘Northwood’.

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Table 1.

The overall flood tolerance ranking is based on the weighted average comprised of the net photosynthetic rate (A) after 45 days of flooding, lenticel rating, and the percent survival. Values for the indicator JR trees are also presented but are not included in statistical comparisons.

Overall ranking	Cultivar	Weighted average	Day 45, A (μmol/m²s)	Lenticel rating	Survival (%)
	James River		1.77	0.75	100
High	Schlesinger	.68 H	1.94 H	0.58 H	100
	Red Sunset	.62 H	1.76 H	0.42 I	100
	‘Bowhall	.59 H	1.71 H	0.67 H	67
Intermediate	‘Armstrong’^*	.49 I	1.09 I	0.42 I	100
	‘Morgan’^*	.46 I	1.45 I	0.25 L	67
	October Glory’	.38 I	0.94 I	0.33 I	67
	Scarlet Sentinel^*	.37 I	0.66 I	0.25 L	100
	‘Autumn Blaze’^*	.33 I	0.43 I	0.25 L	100
Low	‘Karpick’	.21 L	0.21 L	0.17L	67
	‘Autumn Flame’	.20 L	0.02 L	0.33 I	33
	‘Northwood’	.07 L	0.00 L	0.25 I	0

↵* A. × freemanii.
H = High flood tolerance; significantly greater than 1 or L at P = 0.05 using Hsu’s multiple comparison test “smallest is best.”
I = Intermediate flood tolerance; those means that were not identified as the best using “largest is best” or “smallest is best” tests.
L = Low flood tolerance; significantly less than H or I at P= 0.10 using Hsu’s multiple comparison test “largest is best.”