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

• Published in: Revista Brasileira de Ciência do Solo 2014-02, Vol.38 (1), p.205-213
• Main Authors: Vieira, Rogério Faria, Paula Júnior, Trazilbo José de, Carneiro, José Eustáquio de Souza, Queiroz, Marina Viana
• Format: Article
• Language: English
• Subjects: adubação foliar; conteúdo de molibdênio da semente; hábito de crescimento; Phaseolus vulgaris; SOIL SCIENCE
• ISSN: 0100-0683; 1806-9657; 0100-0683
• DOI: 10.1590/S0100-06832014000100020

The 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. A variabilidade genotípica em feijão-comum em acumular molibdênio (Mo) nas sementes foi demonstrada quando o solo é a principal fonte de Mo; entretanto, essa variabilidade ainda é desconhecida quando o Mo é aplicado na folhagem. Portanto, determinaram-se teores de Mo da semente (TMoS) e conteúdos de Mo da semente (CMoS) de 12 genótipos em quatro experimentos conduzidos na Zona da Mata, Minas Gerais, Brasil, nos quais pulverizaram-se as plantas com 600 g ha-1 de Mo. Para comparação, conduziram-se mais dois experimentos sem aplicação de Mo. Nesse caso, não foi detectado Mo na semente ou o TMoS médio foi 2,83 µg g-1, sem diferença significativa entre genótipos. Em média, com aplicação de Mo, os TMoS variaram de 14,7 a 25,0 µg g-1 e os CMoS, de 3,94 a 6,84 µg. 'Majestoso' ficou entre os genótipos com os mais altos TMoS nos quatro experimentos. No entanto, as sementes grandes de 'Jalo MG-65' e 'Carnaval' geralmente apresentaram mais altos CMoS que as sementes pequenas da 'Majestoso'. 'Ouro Negro' e, sobretudo, 'Valente' ficaram entre os genótipos co