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Sensitivity of Peanut to Timing of Heat Stress during Reproductive Development

^a Plant Environment Lab., Univ. of Reading, Dep. of Agriculture, Cutbush Lane, Shinfield, Reading RG2 9AD, UK

View larger version (22K): [in a new window]   Fig. 1 Rate of flower production (number plant-1 d-1) over time (d) from first flowering in (a) the Spanish cv. ICGV 86015; and (b) the Virginia cv. ICGV 87282 grown continuously at 28/22°C and 38/22°C. Vertical bars are the SED for comparing the two temperatures. The stages R2, R3, and R5 show the appearance of first peg, pod and seed at 28/22°C, respectively

View larger version (34K): [in a new window]   Fig. 2 Effect of transferring plants of (a) the Spanish cv. ICGV 86015 and (b) the Virginia cv. ICGV 87282 from 28/22°C (OT) to 38/22°C (HT) and from 38/22°C to 28/22°C at different times relative to flowering on the number of pegs and reproductive dry weights. Horizontal dotted lines show the 95% confidence intervals for comparing the transfers with control (Con) means. Vertical bars show SEDs for comparing transfer means. The different stages of reproductive development R1, R2, R3 show the appearance of first flower, peg, and pod at 28/22°C, respectively

View larger version (19K): [in a new window]   Fig. 3 Variance (s2) of regressions of number of pegs relative to control values against the cumulative number of flowers opening in each 6-d period relative to start of temperature treatment in plants transferred (a) from 28/22°C (OT) to 38/22°C (HT) and (b) from 38/22°C to 28/22°C

View larger version (24K): [in a new window]   Fig. 4 Relations between (a) the total number of pegs relative to 28/22°C (OT) control values and the number of flowers produced in the 6-d period following an episode of 38/22°C (HT) and (b) the total number of pegs relative to 38/22°C control values and the number of flowers produced in the 6-d period following an episode of 28/22°C