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Response of Leaf Photosynthesis during the Grain-Filling Period of Maize to Duration of Cold Exposure, Acclimation, and Incident PPFD

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

View larger version (14K): [in a new window]   Fig. 1. Schedule for 4°C exposure of maize plants in a dark cold room, acclimation after cold exposure in a dark room and ambient temperature, and transferral to the field.

View larger version (29K): [in a new window]   Fig. 2. Daily maximum (top line) and minimum (bottom line) temperatures from 1 May to 30 Sept. 2000 at the Cambridge Research Station, Cambridge, ON, Canada.

View larger version (41K): [in a new window]   Fig. 3. Leaf carbon exchange rate (CER) and the reduction in leaf CER from silking to 5 wk after silking of maize hybrids ‘Pride 5’, ‘Pioneer 3902’, and ‘Cargill 1877’. Data shown are means of three replications of two plants at 1100 h on day following 16-h cold exposure in the dark and 1 h acclimation in the dark.

View larger version (48K): [in a new window]   Fig. 4. (a) Leaf carbon exchange rate (CER) of three hybrids after a 4°C exposure in the dark for either 16 or 2 h and field control across five stages of development during the grain-filling period, and (b) the ratio of variable to maximum chlorophyll fluorescence (Fv/Fm) of dark-adapted leaves of three hybrids after a 4°C exposure in the dark for either 2 or 16 h across two stages of development (i.e., 1 and 3 wk after silking). Measurements were taken after 1-h exposure to high photosynthetic photon flux density following cold exposure.

View larger version (11K): [in a new window]   Fig. 5. Relationship between reduction in leaf carbon exchange rate (CER) after a 16-h exposure to 4°C in the dark and incident photosynthetic photon flux density (PPFD) following cold exposure without acclimation in ‘Pioneer 3902’. In the growth-room study, plants were moved to PPFD levels of either 400, 650, or 1200 mmol m-2 s-1 at 0900 h, and depicted values are means derived from measurements made at 1000, 1200, 1400, and 1600 h. In the field study, plants were moved to the field at 1000 h, and the depicted value at 2000 µmol m-2 s-1 is a mean derived from measurements taken at 1100 and 1500 h across five stages of development (cf., Table 1).