Dynamics of floret initiation/death determining spike fertility in wheat as affected by Ppd genes under field conditions.

Disregarding this curvilinearity, as the trend has a strong linear component, in all cases the linear regression showed a highly significant coefficient of determination ( R 2 ranging from 0.71, P <0.05, to 0.98, P <0.001; Fig. 13 ; Supplementary Figs S1, S2 at JXB online).

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This result was clear and highly significant in the first growing season, but only showed a trend in the second growing season ( Fig. 14 ).

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