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Lectins from Pisum arvense seeds behave differently from storage proteins during germination in the darkness
ABSTRACT - The mobilization of seed proteins from Pisum arvense L. during germination in the absence of light was studied. The seeds were found to be completely consumed 22 days after germination and seedlings ceased growth after the 18th day. SDS-PAGE indicated that the main protein bands correspon...
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Published in: | Revista brasileira de fisiologia vegetal 2000, Vol.12 (3), p.255-262 |
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Main Authors: | , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
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Online Access: | Get full text |
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Summary: | ABSTRACT - The mobilization of seed proteins from Pisum arvense L. during germination in the absence of light was studied. The seeds were found to be completely consumed 22 days after germination and seedlings ceased growth after the 18th day. SDS-PAGE indicated that the main protein bands correspond to high molecular mass storage proteins which undergo proteolysis in the initial stages of germination and are not detected after the 7th day of germination. However, the corresponding lectin profiles were detected during the entire germination process, suggesting that these proteins are strongly resistant to seed proteolytic enzymes and should be important for seedling establishment. Furthermore, haemagglutinating activity in cotyledons was detected until 22 days after germination, indicating that the lectins remain active even in senescent cotyledons.
A mobilização das proteínas de sementes de Pisum arvense L. durante a germinação na ausência de luz foi estudada. As sementes foram completamente exauridas de suas reservas após 22 dias de germinação e as plântulas cresceram até o 18° dia de germinação. Experimentos de eletroforese em gel de poliacrilamida em presença de SDS indicaram que as principais bandas protéicas, correspondendo às proteínas de reserva de alta massa molecular, foram detectadas apenas até o 7° dia após a germinação. Entretanto, as bandas protéicas correspondentes às lectinas da semente puderam ser detectadas ao longo de todo o processo germinativo, sugerindo que essas proteínas são fortemente resistentes à ação das proteases da semente e devem, de alguma forma, ser importantes para o estabelecimento das plântulas. A atividade hemaglutinante nos cotilédones foi detectada até o 22° dia de germinação, indicando que as lectinas também permaneceram ativas quando os cotilédones estavam bastante exauridos de suas reservas. |
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ISSN: | 0103-3131 0103-3131 |
DOI: | 10.1590/s0103-31312000000300008 |