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Genetic Variation in Physiological Discriminators for Cold Tolerance—Early Autotrophic Phase of Maize Development

Univ. of Guelph, Dep. of Plant Agriculture Guelph, Ontario, Canada N1G 2W1

View larger version (51K): [in a new window]   Fig. 1. Percent deviation from control mean for dry weight (DW), carbon exchange rate (CER), SPAD value, quantum efficiency of Photosystem II (PSII), stomatal conductance, root/shoot ratio, and days to 7-leaf stage for the five inbred lines with the highest DW (A) and the five inbred lines with the lowest DW (B). *Percent deviation from DW mean for W23 was 138.9%.

View larger version (48K): [in a new window]   Fig. 2. Percent deviation from control mean for carbon exchange rate (CER), SPAD value, quantum efficiency of Photosystem II (PSII), stomatal conductance, dry weight (DW), root/shoot ratio, and days to 7-leaf stage for the five inbred lines with the highest CER (A) and the five inbred lines with the lowest CER (B). *Percent deviation from DW mean for W23 was 138.9%.

View larger version (48K): [in a new window]   Fig. 3. Percent deviation from control mean for duration from 7-leaf stage, carbon exchange rate (CER), SPAD value, quantum efficiency of Photosystem II (PSII), stomatal conductance, dry weight (DW), and root/shoot ratio for five inbred lines with the shortest duration from 7-leaf stage (A) and the five inbred lines with the longest duration from 7-leaf stage (B). *Percent deviation from DW mean for CG81 was 62.1%.

View larger version (52K): [in a new window]   Fig. 4. Percent deviation from cold stressed mean for dry weight (DW), carbon exchange rate (CER), SPAD value, quantum efficiency of Photosystem II (PSII), stomatal conductance, root/shoot ratio, and days from 7- to 8-leaf stage for five inbred lines with the highest DW (A) and five with the lowest DW (B). *Percent deviation from DW mean for W23 was 138.2%.

View larger version (57K): [in a new window]   Fig. 5. Percent deviation from cold stressed mean for carbon exchange rate (CER), SPAD value, quantum efficiency of Photosystem II (PSII), stomatal conductance, dry weight (DW), root/shoot ratio, and days from 7- to 8-leaf stage the for five inbred lines with the highest CER (A) and the five inbred lines with the lowest CER (B). *Percent deviation from DW mean for CG81 was 67.5%. **Percent deviation from DW mean for W23 was 138.2%.

View larger version (54K): [in a new window]   Fig. 6. Percent deviation from cold stressed mean for number of duration from 7- to 8-leaf stage, carbon exchange rate (CER), SPAD value, quantum efficiency of Photosystem II (PSII), stomatal conductance, dry weight (DW), and root/shoot ratio for the five inbred lines with the longest duration from 7- to 8-leaf stage (A) and the five inbred lines with the shortest duration from 7- to 8-leaf stage (B). *Percent deviation from DW mean for W23 was 138.2%.