Variabilidade genotípica em feijão-caupi em acumular na semente o molibdênio aplicado na folhagem

Abstract

The technique of producing and using seeds rich in Mo is an effective strategy for supplying this micronutrient to plants. To use molybdenum fertilizer efficiently to increase the seed Mo content (CMoS), it is necessary to know the genotypic variability in accumulating Mo in the seed. Our objective was to evaluate the variability among 20 cowpea genotypes in their ability to accumulate Mo applied to the foliage in the seed.

We conducted three experiments: two with the application of 450 g/ha of Mo to the foliage, and one experiment without Mo application. This experiment was conducted to verify the CMoS when the soil is the source of Mo. The seed Mo content (TMoS) and the CMoS were determined. In the experiment without Mo, no Mo was detected in the seeds of any genotype. In experiments with Mo, the TMoS ranged from 30.2 to 47.5 µg/g and the CMoS from 5.8 to 9.7 µg/seed. The genotypes MNC11-1031E-5, MNC11-1013E-33 and MNC11-1034E-2 were in the group with the lowest CMoS in both experiments. Overall, on average across the two experiments, the largest difference in CMoS observed was 33% (MNC11-1031E-5 line compared to the BRS Guariba cultivar). Our results suggest that there is genotypic variability and high efficiency of cowpea in accumulating Mo applied to the foliage in the seed