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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 ANATOMY AND ROOT CELL ULTRASTRUCTURE OF SOYBEAN GENOTYPES UNDER MANGANESE STRESS

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Autor(es):
Lavres Junior, Jose [1] ; Malavolta, Euripedes ; Nogueira, Neusa de Lima [2] ; Moraes, Milton Ferreira [3] ; Reis, Andre Rodrigues [4] ; Rossi, Monica Lanzoni ; Cabral, Cleusa Pereira [1]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] USP, CENA, Lab Nutr Mineral Plantas, BR-13400970 Piracicaba, SP - Brazil
[2] USP, CENA, Lab Histopatol Vegetal & Biol Estrutura Plantas, BR-13400970 Piracicaba, SP - Brazil
[3] USP, CENA, Programa Posgrad Energia Nucl Agr & Ambiente, BR-13400970 Piracicaba, SP - Brazil
[4] Waseda Univ, Dept Civil & Environm Engineer, Shinjuku Ku, Tokyo 1698555 - Japan
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Revista Brasileira de Ciência do Solo; v. 33, n. 2, p. 395-403, MAR-APR 2009.
Citações Web of Science: 9
Resumo

The deleterious effects of both Mn deficiency and excess on the development of plants have been evaluated with regard to aspects of shoot anatomy, ultrastructure and biochemistry, focusing mainly on the manifestation of visual symptoms. However, there is little information in the literature on changes in the root system in response to Mn supply. The objective of this study was to evaluate the effects of Mn doses (0.5, 2.0 and 200.0 mu Mol L(-1)) in a nutrient solution on the anatomy of leaves and roots of the Glycine max (L.) cultivars Santa Rosa, IAC-15 and IAC-Foscarin 31. Visual deficiency symptoms were first observed in Santa Rosa and IAC-15, which were also the only cultivars where Mn-toxicity symptoms were observed. Only in IAC-15, a high Mn supply led to root diameter thickening, but without alteration in cells of the bark, epidermis, exodermis and endodermis. The degree of disorganization of the xylem vessels, in particular the metaxylem, differed in the cultivars. Quantity and shape of the palisade parenchyma cells were influenced by both Mn deficiency and toxicity. A reduction in the number of chloroplasts was observed in the three Mn-deficient genotypes. The anatomical alterations in IAC-15 due to nutritional stress were greater, as expressed in extensive root cell cytoplasm disorganization and increased vacuolation at high Mn doses. The degree of changes in the anatomical and ultrastructural organization of roots and leaves of the soybean genotypes studied differed, suggesting the existence of tolerance mechanisms to different intensities of Mn deficiency or excess. (AU)

Processo FAPESP: 04/15897-7 - Potencial de contaminação do solo e plantas por metais pesados contidos em fertilizantes
Beneficiário:Milton Ferreira de Moraes
Linha de fomento: Bolsas no Brasil - Doutorado
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