Abstract
Soybean is a self-sufficient specie in nitrogen acquisition due to their efficient association with diazotrophs. Unlike bean, which requires nitrogen 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 due 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, respectively. The results revealed that soybeans keep producing leaves, branches and roots even after flowering, indicating no limitation in the supply of photosynthates to its organs, especially to the roots, where a predominant allocation of photosynthates 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.
Highlights
The partitioning of carbohydrates among the various organs of a plant differs among species and varies during ontogeny regulating development and growth, which become more complex as plants progress through successive growth stages as seedlings, adults and senescents
Equations were fitted to the data and the correlation coefficients (r) and levels of significance (F-test) were determined for leaf area (LA), GLDM, PEDM, branch dry mass (BDM), SDM, pod mass (PDM), RDM and total dry mass (TDM) as a function of age (DAE)
The same cubic exponential equation was fitted to the LA, GLDM, PEDM, SDM, TDM and RDM data
Summary
The partitioning of carbohydrates among the various organs of a plant differs among species and varies during ontogeny regulating development and growth, which become more complex as plants progress through successive growth stages as seedlings, adults and senescents.The development, growth and partitioning of photosynthates between plant parts vary with species and age but are genetically controlled, driven by signals from environmental factors, such as theActa Scientiarum. Agronomy availability of light and nutrients, soil moisture and air temperature These factors can affect hormonal balance, especially by changing the direction of the photosynthate supply to certain organs during times of great demand (DANTAS et al, 2007; LALONDE et al, 2004; SANDRIN et al, 2006; TAIZ; ZEIGER, 2008; TANAKA; FUGITA, 1979). With legumes such as bean and soy, the need to allocate photosynthates to the development of their various organs may be accompanied by a strong demand for nitrogen-fixing Bacteroides in the root nodules.
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