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Résumé :
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The final number of reproductive nodes (TRN) is highly variable in pea under field conditions and can limit yield. However, the determinants of this variability are unknown. This is a problem for crop managers and for many crop simulation models, in which the assimilate production and partitioning modules generally depend on a phenological module including simulation of TRN. Previous studies in growth cabinets have linked the end of flowering to the presence of growing pods near the apex. We investigated the effects of the position of reproductive organs on the stem on the cessation of leaf emergence by analytical experiments involving pod removal. We then analysed whether developmental characteristics, obtained in the field for Various genotypes, locations, sowing dates, plant nitrogen status, plant water status and plant densities, could account for the observed variation in the number of reproductive nodes. On the basis of these results, we constructed a simple model simulating TRN from three developmental parameters. The model was calibrated on cultivar 'Solara', evaluated for a wide range of situations and extrapolated to many genotypes, and was found to have high predictive value. (C) 1998 Annals of Botany Company.
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