Data/hora: 03/06/2024 06:41:16

Biblioteca(s): | Embrapa Meio Norte / UEP-Parnaíba.
Data corrente: | 08/03/1995
Data da última atualização: | 08/03/1995
Autoria: | CORBINEAU, F.; POLJAKOFF-MAYBER, A.; COME, D.
Afiliação: | Univ. Pierre et Marie Curie; Idem; The Hebrew Univ. of Jerusalem.
Título: | Responsiveness to abscisic acid of embryos of dormant oat (Avena sativa) seeds: involvement of ABA-inducible proteins.
Ano de publicação: | 1991
Fonte/Imprenta: | Physiologia Plantarum, v.83, p.1-6, 1991.
Idioma: | Inglês
Notas: | Separata.
Conteúdo: | Abscisic acid (ABA) inhibited the germination of embryos isolated fromoat (Avena sativa L.) dormant seeds. The inhibition increased with ABAconcentration. The embryos were 1000 times more responsive to ABA at 30oC than at 10oC (30oC being the temperature at which dormancy is expressed). Exposure of embryos to 0.5 uM ABA for less than 8h did not affect subsequent germination in water, and did not induce synthesis of new proteins. Exposure for at least 14h was necessary to induce subsequent inhibition of germination. Such long exposure to ABA also affectedprotein synthesis. The molecular weights of the main ABA-inducible proteins were in the range between 44 and 24kDa. Synthesis of small polypeptides, around 10 and 6 kDa was also induced. Synthesis of most of these ABA-inducible proteins disappeared when embryos were transferredto water. The general results suggest that the presence of ABA was necessary to maintain the synthesis of ABA-inducible proteins; on removalof ABA their synthesis ceased. No apparent correlation between these proteins and germination was revealed. However, a 26 kDa band was observed in the extract of control embryos imbibed for 24h in water; this band was not present after 8 or 16h imbibition and was also absent in extracts of ABA treated embryos.
Palavras-Chave: | Sementes.
Thesagro: | Dormência; Fisiologia Vegetal.
Categoria do assunto: | --
Registro original: | Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)
Exemplares: | CPAMN-UEPP - (3729-1) - EMB - SP - -- -  -  - 1995.00020 - DIS