《Table 1–Summary of final mean numbers of internodes, mean mainstem lengths, and pod number per plan

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《"Elevated temperature intensity, timing, and duration of exposure affect soybean internode elongation, mainstem node number, and pod number per plant"》

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1Total pods per plant include pods that were mature along with some that were green but with full-sized seed.2Start date of 30/22 TTR is actually the sowing date，DAS=0.3Column means with the same letter are not statistically different，alpha=0.05，Tukey's

In the first part of EXP 3，continuous ELT temperature treatments of 38/30 and 42/34°C were imposed at 9 DAS on seedlings initially grown at 30/22°C.The effect of ELT on internode elongation and number of internodes for these treatments was more pronounced compared with those in EXP 1 and EXP 2（Fig.6-A–C）.For plants grown under the 30/22°C treatment，internodes started to elongate progressively from the fifth internode and reached the longest point around internode position numbers11 or 12（Fig.6-A），a pattern similar to those seen in the two previous experiments under the same control temperature（Figs.2-A，4-A）.Above position 12，internode lengths at each increasing internode position number decreased progressively.An ANOVA comparing the internode lengths at each internode position among EXP 1，2，and 3 for the 30/22°C treatment showed no significant differences for the first 19 internode position numbers.However，the mean final number of nodes was greater for EXP 1 than for EXP 2 and EXP 3 for this control temperature（Figs.2，4，7，Table 1），probably because of the longer day length for the May 16 planting date（Fig.1）[28，29].Total mainstem length tended to be greater for the May 16planting date also（Table 1）.