Acúmulo e distribuição de boro em cultivares de algodão
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Data
2012-08-01
Autores
Rosolem, Ciro Antonio [UNESP]
Deus, Angélica Cristina Fernandes
Martins, Priscila Oliveira
Léles, Érica Pontes
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Ciência do Solo
Resumo
O algodoeiro é responsivo à adubação boratada, porém há poucas e controversas observações a respeito da mobilidade do nutriente dentro da planta. Este trabalho teve por objetivo avaliar a translocação e o acúmulo de boro (B) em cultivares de algodão. Quatro cultivares de algodão (FM 993, FM 910, FMT 701 e FMT 523) foram cultivadas em duas concentrações de B (0 e 4,5 mmol L-1) na solução nutritiva, em vasos com capacidade de 8 L preenchidos com areia lavada, por seis semanas. Os vasos receberam solução nutritiva uma vez por semana. em seguida, as plantas foram amostradas durante quatro semanas consecutivas, determinando-se a matéria seca e acúmulo total de B nas raízes e na parte aérea, a distribuição e acúmulo de B nos tecidos da planta e o teor e acúmulo de B nas folhas em diferentes nós da haste principal. O delineamento experimental foi em blocos ao acaso, em esquema fatorial 4 x 2, com parcelas subdivididas no tempo (semanas de amostragem), com quatro repetições. As cultivares FM 993 e FMT 523 alcançaram maior produção de matéria seca e acúmulo de B na raiz. Plantas cultivadas sem deficiência de B acumulam mais de 50 % do B nas folhas, ao passo que, em plantas sem aplicação do micronutriente, o B se encontra em maior proporção nas raízes e no caule. Não há evidência de translocação de B em diferentes cultivares de algodão, mesmo quando cultivadas em deficiência desse nutriente.
Cotton is responsive to boron fertilization, however, results on the mobility of this nutrient in the plant are few and controversial. This study had the objective of evaluating boron translocation and accumulation in cotton cultivars. Four cotton cultivars (FM 993, FM 910, FMT 701, and FMT 523) were grown for six weeks in 8 L pots with washed sand and nutrient solution at two boron concentrations (0 and 4.5 ∝mol L-1). After six weeks, plants were sampled for four more weeks to determine dry matter yield and total boron accumulation in root and shoots, boron distribution in plant tissues, and boron content and accumulation in leaves from different plant nodes. The experiment was arranged in a 4 x 2 factorial with sub plots (sampling time) and four replications. Dry matter yield and boron accumulation in roots were highest in the cultivars FM 993 and FMT 523. Cotton plants grown in non-deficient B solutions accumulate more than 50 % of the absorbed B in leaves, but in B deficient plants, B is found at a higher proportion in roots and stems. There is no evidence of B translocation in different cotton cultivars, even in plants under B deficiency.
Cotton is responsive to boron fertilization, however, results on the mobility of this nutrient in the plant are few and controversial. This study had the objective of evaluating boron translocation and accumulation in cotton cultivars. Four cotton cultivars (FM 993, FM 910, FMT 701, and FMT 523) were grown for six weeks in 8 L pots with washed sand and nutrient solution at two boron concentrations (0 and 4.5 ∝mol L-1). After six weeks, plants were sampled for four more weeks to determine dry matter yield and total boron accumulation in root and shoots, boron distribution in plant tissues, and boron content and accumulation in leaves from different plant nodes. The experiment was arranged in a 4 x 2 factorial with sub plots (sampling time) and four replications. Dry matter yield and boron accumulation in roots were highest in the cultivars FM 993 and FMT 523. Cotton plants grown in non-deficient B solutions accumulate more than 50 % of the absorbed B in leaves, but in B deficient plants, B is found at a higher proportion in roots and stems. There is no evidence of B translocation in different cotton cultivars, even in plants under B deficiency.
Descrição
Palavras-chave
Gossypium hirsutum L., deficiência de boro, nutrição mineral, micronutriente, Gossypium hirsutum L., boron deficiency, mineral nutrition, micronutrient
Como citar
Revista Brasileira de Ciência do Solo. Sociedade Brasileira de Ciência do Solo, v. 36, n. 4, p. 1231-1238, 2012.