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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Changes in the ultrastructure of soybean cultivars in response to manganese supply in solution culture

Texto completo
Autor(es):
Lavres Junior, Jose [1] ; Reis, Andre Rodrigues [2] ; Rossi, Monica Lanzoni [3] ; Cabral, Cleusa Pereira [1] ; Nogueira, Neusa de Lima [3] ; Malavolta, Euripedes
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] USP CENA, Lab Nutr Mineral Plantas, BR-13400970 Piracicaba, SP - Brazil
[2] Waseda Univ, Dept Civil & Environm Engn, Shinjuku Ku, Tokyo 1698555 - Japan
[3] USP CENA, Lab Histopatol & Biol Estrutural Plantas, BR-13400970 Piracicaba, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Scientia Agricola; v. 67, n. 3, p. 287-294, 2010.
Citações Web of Science: 17
Resumo

The deleterious effects of Mn stress on many species have been studied, mainly concerning biochemical, physiological and growth parameters of plants. However, there are few studies relating the anatomical and ultrastructural changes in response to manganese (Mn) nutritional disorders, This study examined the leaf ultrastructure of Mn-inefficient (IAC-15, Santa Rosa) and Mn-efficient (IAC-Foscarin 31) soybean (Glycine max L.) genotypes in response to three rates of Mn (0.5, 2 and 200 mu mol L(-1)) in the nutrient solution. Symptoms of Mn deficiency developed 12 days after transplanting in IAC-15 and Santa Rosa, followed by IAC-Foscarin 31 on the 15(th) day. Only IAC-15 and Santa Rosa leaves showed symptoms of Mn toxicity. The Mn concentration in leaves ranged from 8.6 (deficiency) to 886.3 mg kg(-1) d.w. (toxicity). There were no changes either in stomata length or stomata number per unit of leaf surface. Cytoplasm disorganization was observed in IAC-15 under Mn-excess. In this case, the cytoplasm was amorphous, densely stained and extensively disorganized, with increased vacuolation. Mn effects were not found in mitochondria and nucleus in any of the genotypes tested. Under all Mn concentrations, many lipid globules were observed in the IAC-15 chloroplasts. There was an increase in the number of plastids as well as in the size of starch grains within IAC-Foscarin 31 chloroplasts as Mn concentration in the nutrient solution increased. Genotypes had marked differences in the ultrastructure organization, mainly in leaf chloroplasts grown under conditions of both Mn deficiency and toxicity (the most sensitive genotype was IAC-15). (AU)

Processo FAPESP: 07/58406-1 - Avaliação da disponibilidade do níquel no solo por métodos químicos e biológico
Beneficiário:José Lavres Junior
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 04/09411-4 - Efeito varietal na aquisição do manganês pela soja
Beneficiário:Euripedes Malavolta
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 06/54552-0 - Características fisiológicas e bioquímicas da plnata e sementes de cafeeiro em função das doses de nitrogênio
Beneficiário:André Rodrigues dos Reis
Linha de fomento: Bolsas no Brasil - Mestrado