Comparison of the allocation of phytomass in soybean and bean and its potential role in biological nitrogen fixation
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Universidade Estadual de Maringá
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Soybean is a self-sufficient specie in nitrogen acquisition due to their efficient association with diazotrophs. Unlike bean, which requires nitr ogen supplementation, soybean is not dependent on nitrogen fertilization. This interspecies difference may be related to the allocation pattern of photosynthates during their growth cycles. Distinct from soybean, common bean cannot maintain their active nodules until the end of their growth cycle du e to the unavailability of photosynthates in their roots after flowering. To compare the partitioning of the phytomass in soybean ( Glycine max (L.) Merrill) and common bean ( Phaseolus vulgaris L.) species during their ontogenetic cycles, a growth analysis experiment were conducted with Favorita BRS and BRS Pontal varieties, respec tively. The results revealed that soybeans keep producing leaves, branches and root s even after flowering, indicating no limitation in the supply of photosynthates to its organs, especia lly to the roots, where a predominan t allocation of ph otosynthates can favor nodule activity. After flowering in bean plants, allocation preferentially occurs to the pods at the expense of the other organs including the roots, which potentially affects their nodule activity.
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