Article Figures & Data
Figures
- Figure 1.
Regression of chlorophyll fluorescence value Fv/Fm after heat stress (44 °C, 20 mins) exposure in foliar tissue of 8 Acer species. y = chlorophyll fluorescence value; a = chlorophyll fluorescence of control value (calculated intercept); x = rate of fluorescence with heat (T).
- Figure 2.
Regression of leaf chlorophyll content (SPAD values) after heat stress (44 °C, 20 mins) exposure in foliar tissue of 8 Acer species. y = leaf chlorophyll content (SPAD value); a = leaf chlorophyll content (SPAD values) of control value (calculated intercept); x = rate of leaf chlorophyll content (SPAD value) with heat (T).
- Figure 3.
Recovery rates of chlorophyll fluorescence value Fv/Fm after 72 hours following heat stress (44 °C, 20 mins) in foliar tissue of 8 Acer species. y = chlorophyll fluorescence value; a = chlorophyll fluorescence of control value (calculated intercept); x = rate of fluorescence with heat (T).
- Figure 4.
Recovery rates of leaf chlorophyll content (SPAD values) after 72 hours following heat stress (44 °C, 20 mins) in foliar tissue of 8 Acer species. y = leaf chlorophyll content (SPAD value); a = leaf chlorophyll content (SPAD values) of control value (calculated intercept); x = rate of leaf chlorophyll content (SPAD value) with heat (T).
Tables
- Table 1.
Percent reduction (–) in Fv/Fm compared to zero values (i.e., before heat stress was imposed). Species are ranked in order of tolerance based on percent reductions in Fv/Fm as a measure of damage to the leaf photosynthetic system.
Fv/Fm Species July August A. pseudoplatanus ‘Negenia’ –18.2d –7.3c A. pseudoplatanus ‘Spaethii’ –29.0c –11.4c A. platanoides ‘Royal Red’ –33.6bc –12.8c A. campestre –31.6bc –13.9c A. campestre ‘Louisa Red Shine’ –34.4bc –31.6b A. platanoides ‘Princeton Gold’ –36.0bc –26.4b A. platanoides ‘Emerald Queen’ –40.8b –32.0b A. platanoides ‘Drummondii’ –53.0a –47.9a Numbers within a column followed by a common letter (taken from regression equations [Figure 1]) are not significantly different according to Tukey’s honest significance test (P = 0.05).
- Table 2.
Percent reduction (-) or increase (+) in leaf chlorophyll content (SPAD values) compared to zero values (i.e., before heat stress was imposed). Species are ranked in order of tolerance based on percent reductions in SPAD values as a measure of damage to the leaf chloroplast membrane.
SPAD Species July August A. pseudoplatanus ‘Spaethii’ +2.46a –5.52a A. campestre ‘Louisa Red Shine’ –1.57a –3.90a A. pseudoplatanus ‘Negenia’ –2.25a –3.25a A. platanoides ‘Royal Red’ –3.94a –3.85a A. campestre –6.36a –1.22a A. platanoides ‘Emerald Queen’ –4.70a –7.55a A. platanoides ‘Princeton Gold’ –5.31a –10.6a A. platanoides ‘Drummondii’ –8.82a –8.11a Numbers within a column followed by a common letter (taken from regression equations [Figure 2]) are not significantly different according to Tukey’s honest significance test (P = 0.05).
- Table 3.
Percent reduction (-) or increase (+) in Fv/Fm after 72 hours following heat stress (44 °C, 20 minutes) in foliar tissue of 8 Acer species. Species are ranked in order of tolerance based on percent increases in Fv/Fm as a measure of recovery from damage to the leaf photosynthetic system.
Species Fv/Fm A. platanoides ‘Royal Red’ +8.42b A. pseudoplatanus ‘Spaethii’ +7.21ab A. campestre +6.36ab A. platanoides ‘Princeton Gold’ +4.79ab A. pseudoplatanus ‘Negenia’ +2.59ab A. platanoides ‘Drummondii’ –1.17ab A. campestre ‘Louisa Red Shine’ –1.76ab A. platanoides ‘Emerald Queen’ –22.80a Numbers within a column followed by a common letter (taken from regression equations [Figure 3]) are not significantly different according to Tukey’s honest significance test (P = 0.05).
- Table 4.
Percent increase (+) in leaf chlorophyll content (SPAD values) after 72 hours following heat stress (44 °C, 20 minutes) in foliar tissue of 8 Acer species. Species are ranked in order of tolerance based on percent increases in leaf chlorophyll content (SPAD values) as a measure of recovery from damage to the leaf chloroplast membrane.
Species SPAD A. platanoides ‘Drummondii’ +22.8a A. platanoides ‘Princeton Gold’ +17.9a A. platanoides ‘Emerald Queen’ +11.7a A. platanoides ‘Royal Red’ +9.80a A. campestre ‘Louisa Red Shine’ +7.26a A. campestre +4.92a A. pseudoplatanus ‘Negenia’ +2.86a A. pseudoplatanus ‘Spaethii’ +2.28a Numbers within a column followed by a common letter (taken from regression equations [Figure 4]) are not significantly different according to Tukey’s honest significance test (P = 0.05).
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