期刊
PLANT BIOLOGY
卷 17, 期 5, 页码 990-996出版社
WILEY
DOI: 10.1111/plb.12332
关键词
Abscisic acid; auxin; cytokinin; gibberellin; lipid peroxidation; tocopherol
资金
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico) [process 560812/2010-8]
- FAPEMIG (Fundacao de Amparo a Pesquisa do Estado de Minas Gerais) [process PPM 00500-11]
- ICREA Academia prize by the Generalitat de Catalunya
- CNPq
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior) (Brazil)
The hormonal mechanisms involved in palm seed germination are not fully understood. To better understand how germination is regulated in Arecaceae, we used macaw palm (Acrocomia aculeata (Jacq.) Lodd. Ex Mart.) seed as a model. Endogenous hormone concentrations, tocopherol and tocotrienol and lipid peroxidation during germination were studied separately in the embryo and endosperm. Evaluations were performed in dry (D), imbibed (I), germinated (G) and non-germinated (NG) seeds treated (+GA(3)) or not treated (control) with gibberellins (GA). With GA(3) treatment, seeds germinated faster and to a higher percentage than control seeds. The +GA(3) treatment increased total bioactive GA in the embryo during germination relative to the control. Abscisic acid (ABA) concentrations decreased gradually from D to G in both tissues. Embryos of G seeds had a lower ABA content than NG seeds in both treatments. The GA/ABA ratio in the embryo was significantly higher in G than NG seeds. The +GA(3) treatment did not significantly affect the GA/ABA ratio in either treatment. Cytokinin content increased from dry to germinated seeds. Jasmonic acid (JA) increased and 1-aminocyclopropane-1-carboylic acid (ACC) decreased after imbibition. In addition, -tocopherol and -tocotrienol decreased, while lipid peroxidation increased in the embryo during germination. We conclude that germination in macaw palm seed involves reductions in ABA content and, consequently, increased GA/ABA in the embryo. Furthermore, the imbibition process generates oxidative stress (as observed by changes in vitamin E and MDA).
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