Genotypic variability in seed accumulation of foliar-applied molybdenum to common bean

Abstract

SUMMARYThe genotypic variability in molybdenum (Mo) accumulation in common bean seeds has been demonstrated in cases in which soil is the main Mo source, but this variability is yet unknown when Mo is foliar-applied. Therefore, seed Mo concentrations (SMoCc) and seed Mo contents (SMoCt) of 12 genotypes were determined in four experiments in the Zona da Mata, Minas Gerais, Brazil, in which plants were sprayed with 600 g ha -1 Mo. For comparison, two additional experiments without external Mo were conducted. Without Mo application, the average SMoCc was undetectable or 2.83 µg g -1 , without significant differences among genotypes. On average, with Mo applications, SMoCc ranged from 14.7 to 25.0 µg g -1 and SMoCt, from 3.94 to 6.84 µg. 'Majestoso' was among the genotypes with the highest SMoCc in the four experiments. However, the large-seeded 'Jalo MG-65' and 'Carnaval' generally had higher SMoCt than the small-seeded 'Majestoso'. 'Ouro Negro' and especially 'Valente' were among the genotypes with the lowest SMoCc and SMoCt. The values of these variables were 61 and 90 %, respectively, higher for 'Majestoso' than those for 'Valente'. Our results suggest that common bean genotypes differ in their capacity to accumulate foliar-applied Mo in the seeds. Mo-rich seeds of large-seeded genotypes or of small-seeded of small-seeded genotypes with good capacity to accumulate Mo in seeds can be produced with relatively less Mo fertilizer.Index terms: Phaseolus vulgaris, seed molybdenum content, foliar fertilization, growth habit.(

<b>Split application of molybdic fertilizer at the reproductive stage of common bean increases the molybdenum content in seed

“…This difference in soil pH helps to explain the higher SMoC in Oratórios. SMoC means obtained in this study with the split of 600 g Mo ha -1 were somewhat higher compared to those obtained by Vieira et al (2014) in the same area, with the same cultivar and also applying part of the Mo at the reproductive stage.…”

“…The dose of 600 g Mo ha -1 was used to produce Mo-rich seeds of the common bean (Vieira, Paula Júnior, Carneiro, & Queiroz, 2014). The latter dose was also split as follows: 100(V4)+500(R5), 100(V4)+500(R7), 100(V4)+250(R5)+250(R7), and 100(V4)+150(R5) +350(R7).…”

“…Seed Mo concentrations were estimated using an atomic emission spectrometer with inductively coupled plasma (ICP-OES, Perkin-Elmer Optima 3300 DV) according to the procedures described by Vieira et al (2014). Seed Mo content (SMoC) represents the accumulated Mo in one seed that will be available to the plant grown from this seed.…”

A aplicação foliar de molibdênio na fase de enchimento de vagens do feijão-comum pode reduzir a qualidade da semente

“…Usou-se o cultivar BRSMG Majestoso, do grupo comercial carioca e de hábito de crescimento indeterminado (tipo III), que é bom acumulador de Mo na semente ( Vieira et al, 2014) Avaliaram-se estande final, produtividade, massa de 100 sementes, germinação e vigor das sementes colhidas. A produtividade e a massa de 100 sementes foram obtidas com sementes com aproximadamente 13% de água (base úmida).…”

“…Na Zona da Mata, 600 g ha -1 de Mo geralmente elevam o conteúdo de Mo para pelo menos 3,6 µg por semente (Vieira et al, 2014), teor com que os feijoeiros não mais respondem à aplicação de Mo na folhagem ( Vieira et al, 2011). Nessa região, o conteú-do de Mo da semente de feijão quase dobrou quando a dose de 1440 g ha -1 de Mo foi dividida em quatro subdoses e aplicada entre V4 (terceira folha trifoliolada) e R5 (pré-floração), em comparação com o efeito da aplicação única em V4 (Vieira et al 2005).…”